68mm threaded bottom bracket shell. 31.6mm seat tube diameter. External cable routing (mechanical drivetrain).Be sure to add me to your favorites list. The item "2008 Cervelo R3 Carbon Road Bike Frameset, Frame & Fork 56cm" is in sale since Tuesday, December 15, 2020. This item is in the category "Sporting Goods\Cycling\Bicycle Frames". The seller is "thehub1373" and is located in Wausau, Wisconsin. This item can be shipped worldwide.