I have a 2005 Trek 1500 with a Bontrager Race crank. If I buy an Ultegra FC-6503 crank, will it fit on my existing bottom bracket? I have no idea what kind of bottom bracket it is.
Cycling Equipment · Public discussion
Bottom Bracket Question
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- 3 April 2006
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- 4 April 2006
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- lava
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lava said:
I have a 2005 Trek 1500 with a Bontrager Race crank. If I buy an Ultegra FC-6503 crank, will it fit on my existing bottom bracket? I have no idea what kind of bottom bracket it is.
No. The bonty race uses an Isis BB (108mm for double and 118 for triple). The Ultegra 3ple (FC-6503) is an octalink.
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hd reynolds said:
No. The bonty race uses an Isis BB (108mm for double and 118 for triple). The Ultegra 3ple (FC-6503) is an octalink.
Thanks! Any specific type of octalink BB I should buy to use with the FC-6503? -
lava said:
Thanks! Any specific type of octalink BB I should buy to use with the FC-6503?
The FC-6503 uses BB-6500 68/118.
Example: performancebike.comprofile.cfmOpen ↗Go with the bb-6500 and not the bb-5500. To me there is not much difference between the FC-5505 105 and Ultegra FC-6503 cranks but the 6500 BB is much smoother, higher quality and much better reviews as well.
Nashbar example. nashbar.comprofile.cfmOpen ↗=
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