Originally Posted by
Drummerboy1975
I'm absolutely sure. I've ridden both. The only real difference is the width of the rear triangl. Yes the chain stays are a touch longer of course but, they're extremely similar.
Leaving aside the question of what constitutes a "real" difference, I just wanted to be clear that the geometries are not the same, just "extremely similar." Thank you for the clarification; insofar as I could figure, even the longer 408mm stays on the larger Helium could not physically accommodate a 40c tire. Open Cycle brag the 40c max tire size provided by the radically dropped stay on the U.P. is extremely short at 420mm. Maybe Ridley had a trick to squeeze the big tire; I didn't know.