Track Crankset compatible with SM-BB72-41
I bought a used frame that came with SM-BB72-41 installed. It doesn't have any spindle though and my newbie guess is spindle come with crankset? Anyways, I want to put a track crankset on this and run the bike in SS. I would appreciate any inputs on which track crankset I should be buying.
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Consider replacing the whole thing BB& all or replace a Road chainring with a Thicker 130 chainring..
Japan has NJS Track Bike standards requirements for KeiRin Racing matched bikes, so they dont drop designs as fast as Road parts do. Dura Ace Track Crank & BB Is still Octalink Dura-Ace Track |
Originally Posted by fietsbob
(Post 19268310)
Consider replacing the whole thing BB& all or replace a Road chainring with a Thicker 130 chainring..
Japan has NJS Track Bike standards requirements for KeiRin Racing matched bikes, so they dont drop designs as fast as Road parts do. Dura Ace Track Crank & BB Is still Octalink Dura-Ace Track |
That's a Shimano BB. Shimano doesn't make a track crankset to fit that BB. You will have to use a normal Hollowtech crank with a single chainring or change the BB. SRAM makes a GXP track crank, you'll need a pressfit GXP BB.
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I'm thinking of "SRAM GXP 170mm 48T Black Omnium Track Crankset w/BB" combo.
https://www.amazon.com/SRAM-170mm-Bl...61ANMXYFHE0VY6 Would this bb fit my bike frame fuji roubaix 1.1? |
Originally Posted by gary408
(Post 19268452)
I'm thinking of "SRAM GXP 170mm 48T Black Omnium Track Crankset w/BB" combo.
https://www.amazon.com/SRAM-170mm-Bl...61ANMXYFHE0VY6 Would this bb fit my bike frame fuji roubaix 1.1? |
Generally the crank is the horse and the BB is the cart. Andy.
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Originally Posted by gary408
(Post 19268391)
I don't have a crankset yet. The frame as SM-BB72-41. If I understand right, you are saying I can remove the bottom bracket. Buy a bottom bracket and a track crankset which are compatible?
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Originally Posted by JohnDThompson
(Post 19269283)
Yes. Shimano doesn't offer a track crank for that Hollowtech bottom bracket, but assuming the shell is threaded, a standard square-taper bottom bracket should work.
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You have seen Gary's frame? , he says the bearings are screwed in externals..
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Originally Posted by fietsbob
(Post 19269302)
You have seen Gary's frame? , he says the bearings are screwed in externals..
http://bike.shimano.com/content/sac-...-bb72-41b.html |
Then the only option is buy a road crank and replace the chainring , I guess..
job is not in front of me, just playing 20 questions, online.. the Sram offer its own press fit BB? IDK. |
How about this one?
https://www.amazon.com/SRAM-GXP-BB86...53NV3MCS5CGYFE Can "SRAM GXP BB86 Bottom Bracket" replace sm-bb72-41 installed in my frame? If so, which of the SRAM GXP (or any) track crankset be used with "SRAM GXP BB86 Bottom Bracket"? Appreciate all your inputs. |
You can get a GXP pressfit BB to use that SRAM crank. It should work fine.
Sram/Truvativ GXP BB86 Bottom Bracket > Components > Drivetrain > Press Fit | Jenson USA |
That frame has vertical dropouts. How do you plan to get the correct chain length in order to run it as a single speed? Hope for the perfect gear combination or use a tensioner pulley?
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Originally Posted by dsaul
(Post 19270800)
That frame has vertical dropouts. How do you plan to get the correct chain length in order to run it as a single speed? Hope for the perfect gear combination or use a tensioner pulley?
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Originally Posted by dsaul
(Post 19270800)
That frame has vertical dropouts. How do you plan to get the correct chain length in order to run it as a single speed? Hope for the perfect gear combination or use a tensioner pulley?
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Originally Posted by alcjphil
(Post 19270858)
I had the same thought as well, just another barrier that the Op hadn't considered. The frame is simply not a good choice for the intended use
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Originally Posted by Slash5
(Post 19270591)
You can get a GXP pressfit BB to use that SRAM crank. It should work fine.
Sram/Truvativ GXP BB86 Bottom Bracket > Components > Drivetrain > Press Fit | Jenson USA |
Originally Posted by Slash5
(Post 19270591)
You can get a GXP pressfit BB to use that SRAM crank. It should work fine.
Sram/Truvativ GXP BB86 Bottom Bracket > Components > Drivetrain > Press Fit | Jenson USA |
A little bit out of my league here and I'm open to correction but this is my understanding...
BB72 is not a sizing standard. BB72 and BB92 are Shimano product numbers and refer to product levels such as Dura Ace or Ultegra. BB92 is a higher quality and more expensive version of a BB72 but they are the exact same size and install identically. The size specification is BB86. A BB86 bottom bracket shell on the frame is 86.5mm wide and 41mm diameter while the crank spindle is 24mm. Any BB86 bottom bracket from any manufacturer will fit the OP's frame. The problem is finding a single speed crankset for BB86.OP may want to ask if there is a BB86 single speed crankset in the Single Speed forum. -Tim- |
Originally Posted by TimothyH
(Post 19276454)
A little bit out of my league here and I'm open to correction but this is my understanding...
BB72 is not a sizing standard. BB72 and BB92 are Shimano product numbers and refer to product levels such as Dura Ace or Ultegra. BB92 is a higher quality and more expensive version of a BB72 but they are the exact same size and install identically. The size specification is BB86. A BB86 bottom bracket shell on the frame is 86.5mm wide and 41mm diameter while the crank spindle is 24mm. Any BB86 bottom bracket from any manufacturer will fit the OP's frame. The problem is finding a single speed crankset for BB86.OP may want to ask if there is a BB86 single speed crankset in the Single Speed forum. -Tim- Being a newbie, it's getting a bit complex for me to understand compatibility of drive trains. My goal is simple. Ride faster (20-25 mph) on flat road using SS. I have 11-speed wheelset that I can convert it to a SS using SS conversion kit and put in on the aluminum frame with vertical drop outs. I may want to change the setup back to a geared bike in the future. So, I decided to put shimano fc-5800 52/36T crankset to fit BB86 SM-BB72-41 BB. I hope, either SS chain (1/2", 1/8") or 10/11 speed chain works. |
Originally Posted by Slash5
(Post 19270591)
You can get a GXP pressfit BB to use that SRAM crank. It should work fine.
Sram/Truvativ GXP BB86 Bottom Bracket > Components > Drivetrain > Press Fit | Jenson USA Looking over this thread again and it appears that @Slash5 is correct. GPX BB86 Bottom Bracket linked above looks like it will work with the S-300 crankset. I didn't think anyone made a 1x road crankset for BB86. My hat is off to you sir. -Tim- |
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