Front derailleur cable pulley on seatpost
#1
Front derailleur cable pulley on seatpost
Hi guys! I recently got a Jamis Renegade gravel bike for a really good price. I has needed a few things done since it sat unused for a couple of years. It has Shimano Sora R3000 components, and the main issue I need to resolve is the front shifting. The front derailleur will only barely move, and only does that with extreme amounts of force. I believe the problem lies in one (or both) of two places:
1. The cable housing isn't fantastic quality stuff
2. The cable route is along the top tube and down the seat tube, wrapping around a pulley attached to the rear of the seat tube
I believe that #2 is the biggest problem, since the pulley sits directly in the exact worst place to put a pulley, where it can accumulate grit and grime as it flies off the rear tire. I'm thinking this is what's causing the extreme resistance in the system.
What I'm wondering is if anyone has advice or best practices on dealing with these seat tube pulleys so they operate properly. I don't love the routing, but I understand why they did it. I haven't noticed a brand on the part, and I'm considering putting a sealed bearing Problem Solvers pulley in its place, but I figured I'd check to see if that's even worth bothering with or if others have maintenance procedures that they like for setups like this. Also, before anyone suggests it, there is no mount on the bottom bracket shell for a cable guide, nor is there a braze-on that I could use to re-route the front derailleur cable down the down tube. If this thing stays with a front derailleur, it's gonna have to use a pulley.
Or, I can just go 1X and be done with the front derailleur entirely.
I appreciate any input/advice/wisdom you can offer. Thanks!
1. The cable housing isn't fantastic quality stuff
2. The cable route is along the top tube and down the seat tube, wrapping around a pulley attached to the rear of the seat tube
I believe that #2 is the biggest problem, since the pulley sits directly in the exact worst place to put a pulley, where it can accumulate grit and grime as it flies off the rear tire. I'm thinking this is what's causing the extreme resistance in the system.
What I'm wondering is if anyone has advice or best practices on dealing with these seat tube pulleys so they operate properly. I don't love the routing, but I understand why they did it. I haven't noticed a brand on the part, and I'm considering putting a sealed bearing Problem Solvers pulley in its place, but I figured I'd check to see if that's even worth bothering with or if others have maintenance procedures that they like for setups like this. Also, before anyone suggests it, there is no mount on the bottom bracket shell for a cable guide, nor is there a braze-on that I could use to re-route the front derailleur cable down the down tube. If this thing stays with a front derailleur, it's gonna have to use a pulley.
Or, I can just go 1X and be done with the front derailleur entirely.
I appreciate any input/advice/wisdom you can offer. Thanks!
#2
Check that the housing isn't coming apart inside the little housing end stops. It will look like wires sticking out.
Make sure there isn't a housing gap under the tape going into the shifter body.
If the pulley is supposed to pivot, make sure it does. Pulleys generally work fine.
Generally, problems like this come from assembly, not design. Find where the cable is binding.
Make sure there isn't a housing gap under the tape going into the shifter body.
If the pulley is supposed to pivot, make sure it does. Pulleys generally work fine.
Generally, problems like this come from assembly, not design. Find where the cable is binding.
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#3
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GGGG
+1
Index housing extruding through the stop is a common cause of high cable friction. The wires pinch in as they would going into a funnel jamming against the inner wire.
The usual cause is an improper ferrule with a conical bottom.
Take things apart, replace the housing, and possibly the inner wire, making sure to use ferrules made for Index housing.
BTW, the least likely we cause is the pulley. That design is unbelievably tolerant of dirt and mud.
+1
Index housing extruding through the stop is a common cause of high cable friction. The wires pinch in as they would going into a funnel jamming against the inner wire.
The usual cause is an improper ferrule with a conical bottom.
Take things apart, replace the housing, and possibly the inner wire, making sure to use ferrules made for Index housing.
BTW, the least likely we cause is the pulley. That design is unbelievably tolerant of dirt and mud.
Last edited by FBinNY; 11-24-23 at 02:09 PM.
#4
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A pulley is how they make a bottom pull derailleur work with top pull cable routing. you could find a compatible top pull FD
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Change the Cable NOW or regret it.. there's a high probability that the Cable is FRAYING inside the Brifter... Change Both shift cables before one of them Breaks in the Brifter and multiplies your task exponentially.
and +1 to cable pulleys working fine... although i've seen a couple all rusted and such, and a cable can derail to one side of them, occasionally, but that is easily seen.. the FRAYED CABLES are not easily seen, and happen way too frequently.
change the cables now or regret not doing it soon.
and +1 to cable pulleys working fine... although i've seen a couple all rusted and such, and a cable can derail to one side of them, occasionally, but that is easily seen.. the FRAYED CABLES are not easily seen, and happen way too frequently.
change the cables now or regret not doing it soon.
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after thinking about this.. I've NEVER seen a Jamis with a pulley in the FD cable line... EVER
then again, i've not seen every jamis model in my rural area, so.....
could you post a pic of the pulley and it's location, please?
is this like your bike?
https://roadbikeaction.com/jamis-ren...l-bike-review/
then again, i've not seen every jamis model in my rural area, so.....
could you post a pic of the pulley and it's location, please?
is this like your bike?
https://roadbikeaction.com/jamis-ren...l-bike-review/
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after thinking about this.. I've NEVER seen a Jamis with a pulley in the FD cable line... EVER
then again, i've not seen every jamis model in my rural area, so.....
could you post a pic of the pulley and it's location, please?
is this like your bike?
https://roadbikeaction.com/jamis-ren...l-bike-review/
then again, i've not seen every jamis model in my rural area, so.....
could you post a pic of the pulley and it's location, please?
is this like your bike?
https://roadbikeaction.com/jamis-ren...l-bike-review/
https://www.jamisbikes.com/support/catalogs/
#8
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Catalog pics don't really show them, so heres a NDS pic of the '20 S3
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williamskg6 You can probably check to see if pulley is turning freely by shifting into the big ring, then without pedalling click the shifter to the low gear position. This should leave enough slack in the cable to see if you can turn the pulley with you finger. The pulley might be mostly obscured by plastic, so might have to try turning the pulley with something smaller than your finger
I'd go ahead replace housing and cable.
I'd go ahead replace housing and cable.
Last edited by LesterOfPuppets; 11-24-23 at 03:47 PM.
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#10
after thinking about this.. I've NEVER seen a Jamis with a pulley in the FD cable line... EVER
then again, i've not seen every jamis model in my rural area, so.....
could you post a pic of the pulley and it's location, please?
is this like your bike?
https://roadbikeaction.com/jamis-ren...l-bike-review/
then again, i've not seen every jamis model in my rural area, so.....
could you post a pic of the pulley and it's location, please?
is this like your bike?
https://roadbikeaction.com/jamis-ren...l-bike-review/
#11
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Nope. It's a 2019 Jamis Renegade Explore. It looks just like this: https://99spokes.com/bikes/jamis/2019/renegade-explore and it's also shown in the 2019 Jamis catalog - somewhere in the middle of the catalog.
don't think or guess.. Find Out.
and trust us... change the cable.... or find out how darn tough it can be to dig a cable out of a brifter.... definitely not a task i want to repeat... but most likely will...
last time i did this was on a bike that completed the last 40 miles of the Seattle To Portland ride with only 8th gear in back and the front three to shift between... a passing rider helped him adjust the rear der. into 8th or he'd have been in tenth gear.
he now swaps in new cables every spring.
Last edited by maddog34; 11-25-23 at 12:18 AM.
#12
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#13
Senior Member
But locate the source of binding first, as maddog34 suggested. That way, you'll know where to look if the binding eventually recurs. And please post your findings, since some of us here are curious.
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Hi guys! I recently got a Jamis Renegade gravel bike for a really good price. I has needed a few things done since it sat unused for a couple of years. It has Shimano Sora R3000 components, and the main issue I need to resolve is the front shifting. The front derailleur will only barely move, and only does that with extreme amounts of force. I believe the problem lies in one (or both) of two places:
1. The cable housing isn't fantastic quality stuff
2. The cable route is along the top tube and down the seat tube, wrapping around a pulley attached to the rear of the seat tube
I believe that #2 is the biggest problem, since the pulley sits directly in the exact worst place to put a pulley, where it can accumulate grit and grime as it flies off the rear tire. I'm thinking this is what's causing the extreme resistance in the system.
What I'm wondering is if anyone has advice or best practices on dealing with these seat tube pulleys so they operate properly. I don't love the routing, but I understand why they did it. I haven't noticed a brand on the part, and I'm considering putting a sealed bearing Problem Solvers pulley in its place, but I figured I'd check to see if that's even worth bothering with or if others have maintenance procedures that they like for setups like this. Also, before anyone suggests it, there is no mount on the bottom bracket shell for a cable guide, nor is there a braze-on that I could use to re-route the front derailleur cable down the down tube. If this thing stays with a front derailleur, it's gonna have to use a pulley.
Or, I can just go 1X and be done with the front derailleur entirely.
I appreciate any input/advice/wisdom you can offer. Thanks!
1. The cable housing isn't fantastic quality stuff
2. The cable route is along the top tube and down the seat tube, wrapping around a pulley attached to the rear of the seat tube
I believe that #2 is the biggest problem, since the pulley sits directly in the exact worst place to put a pulley, where it can accumulate grit and grime as it flies off the rear tire. I'm thinking this is what's causing the extreme resistance in the system.
What I'm wondering is if anyone has advice or best practices on dealing with these seat tube pulleys so they operate properly. I don't love the routing, but I understand why they did it. I haven't noticed a brand on the part, and I'm considering putting a sealed bearing Problem Solvers pulley in its place, but I figured I'd check to see if that's even worth bothering with or if others have maintenance procedures that they like for setups like this. Also, before anyone suggests it, there is no mount on the bottom bracket shell for a cable guide, nor is there a braze-on that I could use to re-route the front derailleur cable down the down tube. If this thing stays with a front derailleur, it's gonna have to use a pulley.
Or, I can just go 1X and be done with the front derailleur entirely.
I appreciate any input/advice/wisdom you can offer. Thanks!
Not many around.
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Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
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Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
#15
There are a few that are available in both top and bottom pull. One is the CX70 detailed in this article.
#16
Yeah, as you say, there aren't many of those around. They can be found, but they're uncommon enough that they're surprisingly expensive. I'm probably going to see if I can get the existing pulley setup working before I go dumping $70 into a front derailleur I won't be able to replace when it wears out/breaks (if that ever happens).
If you compare the Shimano EV tech docs of the FDs, you will see that the cable attachment arm length changes to adapt for the cable pull.
#17
Status and findings
OK. Here's the status on this.
I took it all apart and it seems like it was actually the pulley causing most of the issue, but I found a couple of other problems. The cable was in perfect condition. It is a cheap cable, but it was not frayed, kinked, ground up, or otherwise. The cable housing was equally low quality and super stiff. I replaced it with some Jagwire housing. I also replaced the cable with a Jagwire cable. They're not the high end cable/housing but certainly way better than what was on there. The front derailleur had not been installed correctly either - it was impacting the big chainring teeth (instead of the 1-3mm gap) and was not aligned with the chainring correctly (angled inward a tiny bit). Either it was installed that way, or it took a hit. There aren't marks on it like it took a hit, so I'm guessing poor installation.
As I said, the primary problem was the pulley. It's a very low quality plastic pulley that rides on an aluminum bushing. The pulley spins on the bushing about as smoothly as if it was lubricated with sandpaper. I cleaned it as best I can and put some teflon lubricant on it and it's working much better, but it's getting replaced ASAP.
Regarding the info on the cable pull being different, thank you for that! I had no idea that the cable pull on front derailleurs had been changed on some of these newer Shimano groups. Honestly, would it kill them to not come up with a different cable pull "standard" every other week?
I'm actually thinking of installing Microshift Sword 2x10 on this bike to replace the Sora stuff, so this all might end up being just an intermediate fix until that happens. Either that, or go 1X and put SRAM Rival 1 on it like my other bike. The Rival 1 shifting is louder, but way more snappy than the Sora, and I don't have to muck with a front derailleur.
I took it all apart and it seems like it was actually the pulley causing most of the issue, but I found a couple of other problems. The cable was in perfect condition. It is a cheap cable, but it was not frayed, kinked, ground up, or otherwise. The cable housing was equally low quality and super stiff. I replaced it with some Jagwire housing. I also replaced the cable with a Jagwire cable. They're not the high end cable/housing but certainly way better than what was on there. The front derailleur had not been installed correctly either - it was impacting the big chainring teeth (instead of the 1-3mm gap) and was not aligned with the chainring correctly (angled inward a tiny bit). Either it was installed that way, or it took a hit. There aren't marks on it like it took a hit, so I'm guessing poor installation.
As I said, the primary problem was the pulley. It's a very low quality plastic pulley that rides on an aluminum bushing. The pulley spins on the bushing about as smoothly as if it was lubricated with sandpaper. I cleaned it as best I can and put some teflon lubricant on it and it's working much better, but it's getting replaced ASAP.
The FD-CX70 uses the older amount of front shifter cable pull, common on most 10 speed brifters (non 4700 series & ...). The 2x ST-R3000 uses the 11 speed pull amount, (interestingly the 3x has the older pull design). The longer pull on the '11 speed' brifters is not really compatible with the older FDs. It can probably be made to work, but trimming position may not be correct.
I'm actually thinking of installing Microshift Sword 2x10 on this bike to replace the Sora stuff, so this all might end up being just an intermediate fix until that happens. Either that, or go 1X and put SRAM Rival 1 on it like my other bike. The Rival 1 shifting is louder, but way more snappy than the Sora, and I don't have to muck with a front derailleur.
#18
OK. Here's the status on this.
I took it all apart and it seems like it was actually the pulley causing most of the issue, but I found a couple of other problems. The cable was in perfect condition. It is a cheap cable, but it was not frayed, kinked, ground up, or otherwise. The cable housing was equally low quality and super stiff. I replaced it with some Jagwire housing. I also replaced the cable with a Jagwire cable. They're not the high end cable/housing but certainly way better than what was on there. The front derailleur had not been installed correctly either - it was impacting the big chainring teeth (instead of the 1-3mm gap) and was not aligned with the chainring correctly (angled inward a tiny bit). Either it was installed that way, or it took a hit. There aren't marks on it like it took a hit, so I'm guessing poor installation.
As I said, the primary problem was the pulley. It's a very low quality plastic pulley that rides on an aluminum bushing. The pulley spins on the bushing about as smoothly as if it was lubricated with sandpaper. I cleaned it as best I can and put some teflon lubricant on it and it's working much better, but it's getting replaced ASAP.
Regarding the info on the cable pull being different, thank you for that! I had no idea that the cable pull on front derailleurs had been changed on some of these newer Shimano groups. Honestly, would it kill them to not come up with a different cable pull "standard" every other week?
I'm actually thinking of installing Microshift Sword 2x10 on this bike to replace the Sora stuff, so this all might end up being just an intermediate fix until that happens. Either that, or go 1X and put SRAM Rival 1 on it like my other bike. The Rival 1 shifting is louder, but way more snappy than the Sora, and I don't have to muck with a front derailleur.
I took it all apart and it seems like it was actually the pulley causing most of the issue, but I found a couple of other problems. The cable was in perfect condition. It is a cheap cable, but it was not frayed, kinked, ground up, or otherwise. The cable housing was equally low quality and super stiff. I replaced it with some Jagwire housing. I also replaced the cable with a Jagwire cable. They're not the high end cable/housing but certainly way better than what was on there. The front derailleur had not been installed correctly either - it was impacting the big chainring teeth (instead of the 1-3mm gap) and was not aligned with the chainring correctly (angled inward a tiny bit). Either it was installed that way, or it took a hit. There aren't marks on it like it took a hit, so I'm guessing poor installation.
As I said, the primary problem was the pulley. It's a very low quality plastic pulley that rides on an aluminum bushing. The pulley spins on the bushing about as smoothly as if it was lubricated with sandpaper. I cleaned it as best I can and put some teflon lubricant on it and it's working much better, but it's getting replaced ASAP.
Regarding the info on the cable pull being different, thank you for that! I had no idea that the cable pull on front derailleurs had been changed on some of these newer Shimano groups. Honestly, would it kill them to not come up with a different cable pull "standard" every other week?
I'm actually thinking of installing Microshift Sword 2x10 on this bike to replace the Sora stuff, so this all might end up being just an intermediate fix until that happens. Either that, or go 1X and put SRAM Rival 1 on it like my other bike. The Rival 1 shifting is louder, but way more snappy than the Sora, and I don't have to muck with a front derailleur.
I would lube the pivot on that pulley with grease. It may not seem like a clever design, but it works just like your derailleur pulleys.
#19
OK. Here's the status on this.
Regarding the info on the cable pull being different, thank you for that! I had no idea that the cable pull on front derailleurs had been changed on some of these newer Shimano groups. Honestly, would it kill them to not come up with a different cable pull "standard" every other week?
I'm actually thinking of installing Microshift Sword 2x10 on this bike to replace the Sora stuff, so this all might end up being just an intermediate fix until that happens. Either that, or go 1X and put SRAM Rival 1 on it like my other bike. The Rival 1 shifting is louder, but way more snappy than the Sora, and I don't have to muck with a front derailleur.
Regarding the info on the cable pull being different, thank you for that! I had no idea that the cable pull on front derailleurs had been changed on some of these newer Shimano groups. Honestly, would it kill them to not come up with a different cable pull "standard" every other week?
I'm actually thinking of installing Microshift Sword 2x10 on this bike to replace the Sora stuff, so this all might end up being just an intermediate fix until that happens. Either that, or go 1X and put SRAM Rival 1 on it like my other bike. The Rival 1 shifting is louder, but way more snappy than the Sora, and I don't have to muck with a front derailleur.
#20
Senior Member
True. I would guess that the force acting on the guide pulley under discussion is considerably higher than that seen by derailleur pulleys, though. Thus, grease instead of a lighter lubricant is a very good suggestion.
#21
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OK. Here's the status on this.
I took it all apart and it seems like it was actually the pulley causing most of the issue, but I found a couple of other problems. The cable was in perfect condition. It is a cheap cable, but it was not frayed, kinked, ground up, or otherwise. The cable housing was equally low quality and super stiff. I replaced it with some Jagwire housing. I also replaced the cable with a Jagwire cable. They're not the high end cable/housing but certainly way better than what was on there. The front derailleur had not been installed correctly either - it was impacting the big chainring teeth (instead of the 1-3mm gap) and was not aligned with the chainring correctly (angled inward a tiny bit). Either it was installed that way, or it took a hit. There aren't marks on it like it took a hit, so I'm guessing poor installation.
As I said, the primary problem was the pulley. It's a very low quality plastic pulley that rides on an aluminum bushing. The pulley spins on the bushing about as smoothly as if it was lubricated with sandpaper. I cleaned it as best I can and put some teflon lubricant on it and it's working much better, but it's getting replaced ASAP.
I took it all apart and it seems like it was actually the pulley causing most of the issue, but I found a couple of other problems. The cable was in perfect condition. It is a cheap cable, but it was not frayed, kinked, ground up, or otherwise. The cable housing was equally low quality and super stiff. I replaced it with some Jagwire housing. I also replaced the cable with a Jagwire cable. They're not the high end cable/housing but certainly way better than what was on there. The front derailleur had not been installed correctly either - it was impacting the big chainring teeth (instead of the 1-3mm gap) and was not aligned with the chainring correctly (angled inward a tiny bit). Either it was installed that way, or it took a hit. There aren't marks on it like it took a hit, so I'm guessing poor installation.
As I said, the primary problem was the pulley. It's a very low quality plastic pulley that rides on an aluminum bushing. The pulley spins on the bushing about as smoothly as if it was lubricated with sandpaper. I cleaned it as best I can and put some teflon lubricant on it and it's working much better, but it's getting replaced ASAP.
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Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Last edited by cyccommute; 11-26-23 at 12:43 AM.
#22
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#24
Senior Member
FWIW, the pully is on the seat tube, not the seat post.
I'm pretty sure my old Jamis Nova Pro had a pully on the seat tube and it worked fine.
I'm pretty sure my old Jamis Nova Pro had a pully on the seat tube and it worked fine.
#25