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Bottom bracket numpty...
I have a specialized allez, probably 10 years old. A combination of 8 speed Claris and Sora kit. The Claris cranks say octalink on them. I have been given a friends old tiagra 4700 group (a triple). So...how do I work out which bottom bracket to use on the tiagra cranks?
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.
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4 comments
Sorry for the confusion, I does meant the donor Tiagra crank have a 24 mm tube bonded into it? The picture looks like it could well be Octalink.
I have the BBR60 on two bikes and have never had a moment of bother with either of them, cheap as chips as well.
4700 Tiagra has Hollowtech.... best BB is BBR60, it'll never give you any bother.....
Simple answer to that would be “not sure, do I?” Hopefully the picture shows it, but looks wider than 24mm to me
865E792D-0C2B-4554-A904-2BD3E3747945.jpeg
Does the chainring side crank have a 24 mm diameter steel tube sticking out it? If it does, you want a Hollowtech II bottom bracket.