Originally Posted by
Racing Dan
I have no idea what constitutes "a wider rim" but the claims sure sound like kool aid. 62 psi in a 28 mm is decidedly soft. I cant imagine its all of sudden not soft because you widen the rim a few mm. Why would you even go there and add a bunch of rolling resistance.
Why not test ride a bike(like the OP has) with 21mm inner width hoops, and 28mm road race/training tires? You would see how rim width makes a difference.
BTW, there isn't a huge increase in rolling resistance.