SORA Chainset

shannons dad

New Member
Jul 10, 2005
The first number is the length of the crank arm. 170mm or 175mm. A longer crank can give you more leverage when you push on the pedals, but 5mm? It's not going to make that big a difference. The Sora's OK, I had one on my last road bike, but I always noticed they had a bit of flex in the crank arms. The Tiagra chainset is only a couple quid more, but might be a bit more stiff. It depends on how serious you are with your riding. A bit of flex never bothered me personally. Hope that helps.


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