Need to find “post mount” disc calipers for a cyclocross frame where I’ll running…
#1
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Need to find “post mount” disc calipers for a cyclocross frame where I’ll running…
…Shimano Ultegra 8120 road disc brifters. Could someone point me to a Hope, Magura, Shimano or Tektro caliper that takes Shimano spec mineral oil & has the correct modulation for Shimano disc road (160 mm rotors)?
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Ebay.com
search: Bicycle Post mount disc brake calipers.
Read the descriptions of the calipers in the listings.
if they don't specify fluid types, either ask the seller for more info, or move on to another listing.
i've had good results with Shimano calipers matching their levers.
hint: the magura calipers specify a mineral oil with dye added in an attempt to make it seem special and more exclusive.... etc.
search: Bicycle Post mount disc brake calipers.
Read the descriptions of the calipers in the listings.
if they don't specify fluid types, either ask the seller for more info, or move on to another listing.
i've had good results with Shimano calipers matching their levers.
hint: the magura calipers specify a mineral oil with dye added in an attempt to make it seem special and more exclusive.... etc.
Last edited by maddog34; 11-25-23 at 02:43 PM.
#3
Ebay.com
search: Bicycle Post mount disc brake calipers.
Read the descriptions of the calipers in the listings.
if they don't specify fluid types, either ask the seller for more info, or move on to another listing.
i've had good results with Shimano calipers matching their levers.
hint: the magura calipers specify a mineral oil with dye added in an attempt to make it seem special and more exclusive.... etc.
search: Bicycle Post mount disc brake calipers.
Read the descriptions of the calipers in the listings.
if they don't specify fluid types, either ask the seller for more info, or move on to another listing.
i've had good results with Shimano calipers matching their levers.
hint: the magura calipers specify a mineral oil with dye added in an attempt to make it seem special and more exclusive.... etc.
As you should know, Shimano has two hydraulic formats that pump different amounts of fluid at different pressures through different diameter lines. An ebay seller is not going to be able to correctly divine what will work properly. I don't know why you think giving bad advice with regards to life-or-death equipment is funny, but it is definitely not.
masi61 , because of the issues mentioned, there may not be a good candidate for an aftermarket caliper. Not only does it need the right fluid pumped in the right volume, it needs a barb and olive system compatible with kind of lines the levers designate. I took a brief look, and there doesn't seem to be any official specs or forum chatter about such combinations. Is there a good reason to not use Shimano calipers with whatever mount adapters?
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This isn't an answer and I wish you wouldn't clot threads with non-advice. It is so incredibly tiresome to have a mechanic dispensing rude and bad advice in equal measure.
As you should know, Shimano has two hydraulic formats that pump different amounts of fluid at different pressures through different diameter lines. An ebay seller is not going to be able to correctly divine what will work properly. I don't know why you think giving bad advice with regards to life-or-death equipment is funny, but it is definitely not.
masi61 , because of the issues mentioned, there may not be a good candidate for an aftermarket caliper. Not only does it need the right fluid pumped in the right volume, it needs a barb and olive system compatible with kind of lines the levers designate. I took a brief look, and there doesn't seem to be any official specs or forum chatter about such combinations. Is there a good reason to not use Shimano calipers with whatever mount adapters?
As you should know, Shimano has two hydraulic formats that pump different amounts of fluid at different pressures through different diameter lines. An ebay seller is not going to be able to correctly divine what will work properly. I don't know why you think giving bad advice with regards to life-or-death equipment is funny, but it is definitely not.
masi61 , because of the issues mentioned, there may not be a good candidate for an aftermarket caliper. Not only does it need the right fluid pumped in the right volume, it needs a barb and olive system compatible with kind of lines the levers designate. I took a brief look, and there doesn't seem to be any official specs or forum chatter about such combinations. Is there a good reason to not use Shimano calipers with whatever mount adapters?
Summation: use the shimano parts that are specific to the series group involved....
and masi61 only said he was having trouble FINDING post mount calipers that would work with his shimano master cylinders... and the post laid here for two days, un-answered.
i sent him to an outlet with ALL the choices he listed, then recommended asking pertinent questions, and moving on if the sellers couldn't answer the questions to his satisfaction
You then insulted my abilities, and a few other things.. but only after i'd posted to the thread, and you'd ran online searches for ways to insult someone.
this is exactly why i've once again placed you on my "Ignore" list. .
Here's hoping Masi61 can find the shimano calipers that he needs for his repair or project.
smh.
if you truly wanted to help, you would have found what masi61 needed, posted that info, and not been your usual insultive self.
and you also would have addressed the mineral oil question.
bye bye.
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Shimano BR-RS785 brake calipers
they are Ultegra level - post mount - and compatible with the better quality / narrow track Shimano 160 mm rotors
https://bike.shimano.com/en-EU/produ.../BR-RS785.html
installed them on one of my bikes with SM-RT86 (IceTech) 160 mm rotors and J05A-RF (finned) brake pads (pictures above)
Last edited by t2p; 11-25-23 at 06:15 PM.
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#6
I've also installed a set of XT calipers with my GRX brakes. Works fine.
#7
You gave the same advice i did, and also stated that you don't know what you say i don't know.
Summation: use the shimano parts that are specific to the series group involved....
and masi61 only said he was having trouble FINDING post mount calipers that would work with his shimano master cylinders... and the post laid here for two days, un-answered.
i sent him to an outlet with ALL the choices he listed, then recommended asking pertinent questions, and moving on if the sellers couldn't answer the questions to his satisfaction
You then insulted my abilities, and a few other things.. but only after i'd posted to the thread, and you'd ran online searches for ways to insult someone.
this is exactly why i've once again placed you on my "Ignore" list. .
Here's hoping Masi61 can find the shimano calipers that he needs for his repair or project.
smh.
if you truly wanted to help, you would have found what masi61 needed, posted that info, and not been your usual insultive self.
and you also would have addressed the mineral oil question.
bye bye.
Summation: use the shimano parts that are specific to the series group involved....
and masi61 only said he was having trouble FINDING post mount calipers that would work with his shimano master cylinders... and the post laid here for two days, un-answered.
i sent him to an outlet with ALL the choices he listed, then recommended asking pertinent questions, and moving on if the sellers couldn't answer the questions to his satisfaction
You then insulted my abilities, and a few other things.. but only after i'd posted to the thread, and you'd ran online searches for ways to insult someone.
this is exactly why i've once again placed you on my "Ignore" list. .
Here's hoping Masi61 can find the shimano calipers that he needs for his repair or project.
smh.
if you truly wanted to help, you would have found what masi61 needed, posted that info, and not been your usual insultive self.
and you also would have addressed the mineral oil question.
bye bye.
#8
My first-gen Ultegra came with relabeled XT post mount calipers (i.e., Shimano BR-RS785 brake calipers as mentioned above). In fact, I had to replace one with an XT label. The only practical difference is that the bolt that holds the brake pads in place is 3mm hex in the XT instead of a slot bolt for the Ultegra calipers.
I've also installed a set of XT calipers with my GRX brakes. Works fine.
I've also installed a set of XT calipers with my GRX brakes. Works fine.
#9
Clark W. Griswold
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Ebay.com
search: Bicycle Post mount disc brake calipers.
Read the descriptions of the calipers in the listings.
if they don't specify fluid types, either ask the seller for more info, or move on to another listing.
i've had good results with Shimano calipers matching their levers.
hint: the magura calipers specify a mineral oil with dye added in an attempt to make it seem special and more exclusive.... etc.
search: Bicycle Post mount disc brake calipers.
Read the descriptions of the calipers in the listings.
if they don't specify fluid types, either ask the seller for more info, or move on to another listing.
i've had good results with Shimano calipers matching their levers.
hint: the magura calipers specify a mineral oil with dye added in an attempt to make it seem special and more exclusive.... etc.
Magura uses Royal Blood and like all mineral oil I have seen for brakes has color added but it doesn't really change the price most of the mineral oil is around the same price within a dollar or two generally which isn't really significant. Shimano is red. Tektro is also red, Finish Line is green as is Maxima and Magura and Campagnolo are blue. RGB a very common color model it has no bearing on anything in this case other than what the manufacturer chose.
Getting to the OPs original question Hope makes a lovely 4 pot mineral oil brake called the RX4+ it can be distinguished from the M on the outer cap. https://www.hopetech.com/products/br...x/rx4-caliper/ They are compatible with R8000 series and look really nice especially the anodized ones. I had a former co-worker running them and he loved them and they looked a treat.
People do mix Shimano and Magura and call it Shigura. I haven't seen it really with road but not to say it doesn't exist I just haven't personally seen it. I think with the correct fittings I think it would work fine.
Technically Shimano MTB brakes are a different "cable pull" in a way (obviously no cables) but I have seen people make it work. However if you want to actually use Shimano calipers I would look at BR-RS785: https://bike.shimano.com/en-EU/produ.../BR-RS785.html I am unsure if they are still producing them but it is possible your local shop might have them or you might find another brick and mortar with a set.
You could also run these and run flat mount:
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-140-rotor/
I probably wouldn't run Tektro or other stuff but you could probably get some of that stuff to work.
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#10
Not the greatest advice. You could do better than go to a website and buy whatever.
Magura uses Royal Blood and like all mineral oil I have seen for brakes has color added but it doesn't really change the price most of the mineral oil is around the same price within a dollar or two generally which isn't really significant. Shimano is red. Tektro is also red, Finish Line is green as is Maxima and Magura and Campagnolo are blue. RGB a very common color model it has no bearing on anything in this case other than what the manufacturer chose.
Getting to the OPs original question Hope makes a lovely 4 pot mineral oil brake called the RX4+ it can be distinguished from the M on the outer cap. https://www.hopetech.com/products/br...x/rx4-caliper/ They are compatible with R8000 series and look really nice especially the anodized ones. I had a former co-worker running them and he loved them and they looked a treat.
People do mix Shimano and Magura and call it Shigura. I haven't seen it really with road but not to say it doesn't exist I just haven't personally seen it. I think with the correct fittings I think it would work fine.
Technically Shimano MTB brakes are a different "cable pull" in a way (obviously no cables) but I have seen people make it work. However if you want to actually use Shimano calipers I would look at BR-RS785: https://bike.shimano.com/en-EU/produ.../BR-RS785.html I am unsure if they are still producing them but it is possible your local shop might have them or you might find another brick and mortar with a set.
You could also run these and run flat mount:
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-140-rotor/
I probably wouldn't run Tektro or other stuff but you could probably get some of that stuff to work.
Magura uses Royal Blood and like all mineral oil I have seen for brakes has color added but it doesn't really change the price most of the mineral oil is around the same price within a dollar or two generally which isn't really significant. Shimano is red. Tektro is also red, Finish Line is green as is Maxima and Magura and Campagnolo are blue. RGB a very common color model it has no bearing on anything in this case other than what the manufacturer chose.
Getting to the OPs original question Hope makes a lovely 4 pot mineral oil brake called the RX4+ it can be distinguished from the M on the outer cap. https://www.hopetech.com/products/br...x/rx4-caliper/ They are compatible with R8000 series and look really nice especially the anodized ones. I had a former co-worker running them and he loved them and they looked a treat.
People do mix Shimano and Magura and call it Shigura. I haven't seen it really with road but not to say it doesn't exist I just haven't personally seen it. I think with the correct fittings I think it would work fine.
Technically Shimano MTB brakes are a different "cable pull" in a way (obviously no cables) but I have seen people make it work. However if you want to actually use Shimano calipers I would look at BR-RS785: https://bike.shimano.com/en-EU/produ.../BR-RS785.html I am unsure if they are still producing them but it is possible your local shop might have them or you might find another brick and mortar with a set.
You could also run these and run flat mount:
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-140-rotor/
I probably wouldn't run Tektro or other stuff but you could probably get some of that stuff to work.
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#11
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If you have flat mount calipers with your levers already, go with these https://www.assolutions.ca/flat-moun...adapter-guide/ I used them to fit flat mount hydraulics on the wife's C-dale Caadx.
Hope https://www.hopetech.com/products/br...x/rx4-caliper/ claims their lever is compatible with 8100 series levers and 8000 series, while shimano's compatibility chart doesn't show the levers being compatible with the same calipers, which can often be shimano being picky about how they want things to work. Hope may use different hoses based on the lever or may just find the difference to be small enough that it doesn't matter. Shimano doesn't list any post mount compatible calipers that will work with your levers, I would be suspicious that a 2 piston caliper like Deore's will still work, but at the upper levels MTB has gone 4 piston and road hasn't making them incompatible.
Hope https://www.hopetech.com/products/br...x/rx4-caliper/ claims their lever is compatible with 8100 series levers and 8000 series, while shimano's compatibility chart doesn't show the levers being compatible with the same calipers, which can often be shimano being picky about how they want things to work. Hope may use different hoses based on the lever or may just find the difference to be small enough that it doesn't matter. Shimano doesn't list any post mount compatible calipers that will work with your levers, I would be suspicious that a 2 piston caliper like Deore's will still work, but at the upper levels MTB has gone 4 piston and road hasn't making them incompatible.
#12
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Hope does some really neat stuff sort of the UK version of Paul Component Engineering in sense.
#14
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I was under the impression that as long as the hose type was the same, bh90 or bh59 or whatever and you used mineral oil then you were good to go. Simply a matter of matching the barb, banjos & olives at the right end of the system that that component expects.
I have a mix/match of Shimano and Tektro levers and calipers on several bikes. Works fine. Tektro levers Tektro hose, Shimano caliper, works fine too.
As to 2 pot vs 4 pot...I don't know. It would stand to reason that 4 pot would have 2x the capacity at the same lever stroke (MTN/MTN) or 2x the lever stroke necessary in a mix/match (road/MTN), or half the power (MTN/road) but only if the piston size were held constant. The only reason I can see to do that is to restore the cable like road/MTN incompatibility. Because...Shimano.
The piston size however, is not held constant. 4 pot MTN pistons are smaller. So really, it would be useful if somebody with a 4 pot caliper took a measuring caliper and a bit of geometry to derive the total piston surface area. If equal, then good to go from a functional equivalency perspective since the same amount of fluid is being displaced. Failing that, a person with components on hand could hillbilly together an actual experiment to determine the functional answer with added cost/failure risk.
I have a mix/match of Shimano and Tektro levers and calipers on several bikes. Works fine. Tektro levers Tektro hose, Shimano caliper, works fine too.
As to 2 pot vs 4 pot...I don't know. It would stand to reason that 4 pot would have 2x the capacity at the same lever stroke (MTN/MTN) or 2x the lever stroke necessary in a mix/match (road/MTN), or half the power (MTN/road) but only if the piston size were held constant. The only reason I can see to do that is to restore the cable like road/MTN incompatibility. Because...Shimano.
The piston size however, is not held constant. 4 pot MTN pistons are smaller. So really, it would be useful if somebody with a 4 pot caliper took a measuring caliper and a bit of geometry to derive the total piston surface area. If equal, then good to go from a functional equivalency perspective since the same amount of fluid is being displaced. Failing that, a person with components on hand could hillbilly together an actual experiment to determine the functional answer with added cost/failure risk.
#15
Senior Member
You could also run these and run flat mount:
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-140-rotor/
I probably wouldn't run Tektro or other stuff but you could probably get some of that stuff to work.
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-160-rotor/
https://www.assolutions.ca/shop/adap...ith-140-rotor/
I probably wouldn't run Tektro or other stuff but you could probably get some of that stuff to work.
If you're interested in the +20mm adapter, it looks like there are a few other options that may be a little less expensive...
https://www.wolftoothcomponents.com/...-brake-adapter
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#16
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there is no technical difference in the internals of Shimano hydraulic brakes supplied with BH59 and BH90 brake hose
BH90 is advised - possibly / theoretically stiffer due to smaller internal bore (?) - but you might not feel the difference
I purchased a new set of BH90 brake hoses when I installed new XT levers (BL-M8000 brake levers) and Ultegra calipers (BR-RS785 brake calipers) - but was lazy and just used the old / existing BH59 brake hoses and the brakes are great - no difference compared to another bike with XT levers and calipers and the recommended / proper BH90 brake hose
Last edited by t2p; 11-26-23 at 02:10 PM.
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#18
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I thought of using the Universal Hope braided stainless brake hose then putting a Hope barb/ferrule on one end and a Shimano barb/ferrule on the other end.
I’m going to buy the Hope RX4+ post mount calipers in black from Merlin.UK. I figure they should work well with the 8020 Ultegra hydro 11 speed mechanical shift integrated levers.
I’m going to buy the Hope RX4+ post mount calipers in black from Merlin.UK. I figure they should work well with the 8020 Ultegra hydro 11 speed mechanical shift integrated levers.
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This might be the safest way to go. Those Wolf Tooth adapters look like high quality. Price wise, a set of Ultegra 8070 disc calipers combined with the Wolf Tooth Brackets makes me again consider the Hope RX4+ post mounts though since no adapter bracket would be required.