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There's some info here
https://www.velocipedesalon.com/forum/f40/specialized-osbb-bb30-pf30-38108.html
Is PF30, BB30 and OSBB all the same thing?
They all use crank spindles that are 30mm...other than that you've got two different frame standards and a manufacturer's implementation of them both the type of which varies by frame material. Go figure.
Howard
@inkleined
What is the best solution to run Shimano hollowtech 2 cranks in a Tarmac Pro. I have a 2014 model with carbon Fact cranks currently fitted. I believe there is a carbon OSBB in there at the moment.
Is PF30, BB30 and OSBB all the same thing?
Is this the best option?