Factor’s new O2 VAM sounds like quite the climbing bike: light, stiff, comfy, and newly aero. But is it too light for the pros? Maybe. There doesn’t seem to be any debate about wider tires at the Tour, though, as even 28 mm doesn’t seem like enough.

SRAM has also brought its innovative Transmission mountain bike drivetrain technology down to the GX level, an Australian company wants to bring high-tech carbon fiber inspection to the bike shop level, and James gripes about water bottles.

4:15 — A roundtable on the new Factor O2 VAM climbing bike