downtube shifters mounting
#1
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downtube shifters mounting
Hi all! Your help is highly appreciated!
I'm about to replace my old Simplex friction shifters with not-so-old Shimano 600 or 105 indexed shifters. locally, I can find only shifters intended for mounting directly on the frame onto a dedicated braze-on. My frame does not have those, so I must install them using a clamp-on (if that's the word). My question is are the braze-on shifters compatible with some/any clamps? I can buy a 600 clamp but can find only 105 or late 600 braze-on shifters, and am not sure if those will fit.
Thanks!!!
I'm about to replace my old Simplex friction shifters with not-so-old Shimano 600 or 105 indexed shifters. locally, I can find only shifters intended for mounting directly on the frame onto a dedicated braze-on. My frame does not have those, so I must install them using a clamp-on (if that's the word). My question is are the braze-on shifters compatible with some/any clamps? I can buy a 600 clamp but can find only 105 or late 600 braze-on shifters, and am not sure if those will fit.
Thanks!!!
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If the clamp has a square shaped shifter mount and 5mm bolt holes, then it will work, assuming the clamp is the correct size for your down tube.
Some of the older shifter clamps, particularly the Shimano ones, have 4.5mm bolt holes that can easily be re-threaded to take a standard 5mm bolt.
Some of the older shifter clamps, particularly the Shimano ones, have 4.5mm bolt holes that can easily be re-threaded to take a standard 5mm bolt.
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You might just buy the whole setup cheaper than a mount depending on your application.
https://www.benscycle.com/sunrace-sl...hoC-sUQAvD_BwE
https://www.benscycle.com/sunrace-sl...hoC-sUQAvD_BwE
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you'll need a fairly specific clamp-on band shimano shifter if you want indexed shifting. look carefully at the photo: you'll want the one with the notches cut out near the band or clamp - this particular model will allow for newer index 105, 600, dura ace etc if you're patient i found a couple for cheap on ebay
https://www.ebay.com/itm/Shimano-SL-...0AAOSwK~NftW6b
https://www.ebay.com/itm/Shimano-SL-...0AAOSwK~NftW6b
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If the clamp has a square shaped shifter mount and 5mm bolt holes, then it will work, assuming the clamp is the correct size for your down tube.
Some of the older shifter clamps, particularly the Shimano ones, have 4.5mm bolt holes that can easily be re-threaded to take a standard 5mm bolt.
Some of the older shifter clamps, particularly the Shimano ones, have 4.5mm bolt holes that can easily be re-threaded to take a standard 5mm bolt.
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You're spot on. I got the same info from a local bike guru: almost no braze-on shifters can be fitted onto a clam without the use of a "bushing" thing brooklyn_bike pointed to. am now officially considering adding braze-ons to the frame... yeeeee more unnecessary work to do on the bike
Last edited by zelenovicb; 01-19-21 at 05:05 AM. Reason: additional info
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[QUOTE=dedhed;21883042]You might just buy the whole setup cheaper than a mount depending on your application.
the shipping costs to eastern Europe would be just to much
the shipping costs to eastern Europe would be just to much
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I once dealt with a frame with no brazed on bosses and when the OEM clampon shifters on the DT were replaced with 8 spd variants
in the late '90s I found it expedient to drill a small hole on the bottom side of the DT and thread in a 4-40 sized self tapping
screw to act as a stop to prevent the DT shifters from sliding down the tube under cable tension. This was a steel frame but aluminum
should be no obstacle if clamp on can be found to fit.
in the late '90s I found it expedient to drill a small hole on the bottom side of the DT and thread in a 4-40 sized self tapping
screw to act as a stop to prevent the DT shifters from sliding down the tube under cable tension. This was a steel frame but aluminum
should be no obstacle if clamp on can be found to fit.
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...is there some reason you are averse to using bar end shifters ? If your intention here is to go to indexing, there are plenty of 6,7, and 8 speed indexing barcons bouncing around in the used parts marketplace. Last time I checked, I could still buy 8 speed Shimano indexing barcons new.
...is there some reason you are averse to using bar end shifters ? If your intention here is to go to indexing, there are plenty of 6,7, and 8 speed indexing barcons bouncing around in the used parts marketplace. Last time I checked, I could still buy 8 speed Shimano indexing barcons new.
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no, no particular reason. But, this seems a cheaper, simpler way to do it. I've never actually seen a bike with bar end shifters (the images on the web don't count ), let alone rode one, so I'm not sure of the feel of it. I'm just guessing, but think the cable routing should be very similar to brifters? do I need cable stops on the downtube?
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no, no particular reason. But, this seems a cheaper, simpler way to do it. I've never actually seen a bike with bar end shifters (the images on the web don't count ), let alone rode one, so I'm not sure of the feel of it. I'm just guessing, but think the cable routing should be very similar to brifters? do I need cable stops on the downtube?
Downtube shifters are easier and simpler, if your frame is already set up to accommodate them. You were talking about adding braze-ons, which is neither simpler, nor cheaper.
Shimano indexing barcons feel very similar in performance to DT indexing shifters. They just sit in a different place on your bicycle. Cable housing stop clamps are readily available IME.
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I'd be inclined to keep the Simplex shifters, if those are the retrofriction types. I've used a similar design Shimano SL-422 Light Action downtube shifter on my old steel road bike and liked 'em. There's an internal spring setup that appears to be very similar to the exploded diagrams for other retrofriction shifters. It was quite smooth and easy to use, compared with other simple friction shifters -- although friction shifters with micro-click detents are pretty good too.
I've since switched back to the original Suntour GPX Accushift setup, but the friction shifters were more versatile for switching between wheelsets. I use one rear wheel for the indoor trainer, and another for outdoor rides. There's a slight difference in tolerances that hinders crisp shifting on the wheel I use on the indoor trainer, but I don't bother adjusting it since I don't shift much on the trainer.
I also have older Dura Ace indexed downtube shifters, and I think I may have a set from a 600 Tricolor/early Ultegra group. And a couple of Shimano bar-end index shifters, one 8-speed Ultegra, the other 10-speed Dura Ace from a time trial/tri-bike with aero bars. I'm currently using the Shimano 8-speed bar ends on my hybrid with albatross swept bars. Excellent for that use.
A few local friends use bar end shifters on their drop bar road bikes. I'm considering that for one bike but I'll need another set of handlebars. Their bikes are set up for casual riding, with wide drop bars.
One problem I can foresee with bar-end shifters is striking the bar-ends with my knees. I'm tall and skinny and prefer fairly narrow 38cm or 40cm drop bars. However when I stand to pedal up climbs or sprints, my left knee occasionally strikes the bar-end mirror. No big deal, the mirror is on a ball joint so it just moves out of the way and I re-adjust it after sitting to pedal. But that would be disastrous with bar end shifters on climbs or sprints.
So if I decide to try bar end shifters on a drop bar road bike I'll need wider bars, or at least bars flared to 42cm or wider in the drops. Some rando and gravel bike bars would probably do. I could try cutting the ends from one of my current sets of 40cm or 42cm drops and see if it prevents knee strike without compromising handling feel. I also use the drops when standing to climb or sprint, so I'm picky about bike balance and leverage in the drops.
I've since switched back to the original Suntour GPX Accushift setup, but the friction shifters were more versatile for switching between wheelsets. I use one rear wheel for the indoor trainer, and another for outdoor rides. There's a slight difference in tolerances that hinders crisp shifting on the wheel I use on the indoor trainer, but I don't bother adjusting it since I don't shift much on the trainer.
I also have older Dura Ace indexed downtube shifters, and I think I may have a set from a 600 Tricolor/early Ultegra group. And a couple of Shimano bar-end index shifters, one 8-speed Ultegra, the other 10-speed Dura Ace from a time trial/tri-bike with aero bars. I'm currently using the Shimano 8-speed bar ends on my hybrid with albatross swept bars. Excellent for that use.
A few local friends use bar end shifters on their drop bar road bikes. I'm considering that for one bike but I'll need another set of handlebars. Their bikes are set up for casual riding, with wide drop bars.
One problem I can foresee with bar-end shifters is striking the bar-ends with my knees. I'm tall and skinny and prefer fairly narrow 38cm or 40cm drop bars. However when I stand to pedal up climbs or sprints, my left knee occasionally strikes the bar-end mirror. No big deal, the mirror is on a ball joint so it just moves out of the way and I re-adjust it after sitting to pedal. But that would be disastrous with bar end shifters on climbs or sprints.
So if I decide to try bar end shifters on a drop bar road bike I'll need wider bars, or at least bars flared to 42cm or wider in the drops. Some rando and gravel bike bars would probably do. I could try cutting the ends from one of my current sets of 40cm or 42cm drops and see if it prevents knee strike without compromising handling feel. I also use the drops when standing to climb or sprint, so I'm picky about bike balance and leverage in the drops.