I think I understand the basic concept of why a wider rim is better, ie more tire support and how it puts more tread on the ground, which both support better traction. But is there a limit? At some point it has to significantly increase rolling resistance right? What is the "sweet-spot" for XC racing? How does a wider rim increase air volume, heard that a few times. With a wider rim do you drop down a tire size? Right now I run 19 mm rims with a 2.25 front and I do find it a little squirrely at low pressure (20-22 psi for 160 lb rider). Looking at the Roval SL's at 22 mm, the LB's at 23 mm, I9's at 23 mm, and at the far end of the spectrum the new AC Wide Lightning at 30 mm. I lack confidence in pushing my tires into corners so I'm hoping a wider wheel will help. Thanks for your help.
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