It should take a 45×2 like nearly every other Cervelo, but one or two seem to have sneaked out of the factory with tall compression rings, so it could be 45×3. Both are in stock.
It seems it should be here today, so I'll measure-up and get back to you.
@Scilly.Suffolk started
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It should take a 45×2 like nearly every other Cervelo, but one or two seem to have sneaked out of the factory with tall compression rings, so it could be 45×3. Both are in stock.