Join Date: Jul 2006
Location: Columbus, OH
Bikes: '08 Surly Cross-Check, 2011 Redline Conquest Pro, 2012 Spesh FSR Comp EVO, 2015 Trek Domane 6.2 disc
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Those are tire sizes (2.0 inches vs. 2.125 inches).
Both of them being 26" rims, they should work just fine.
Make sure that the hub spacing is the same in the rear, and that you swap over your friend's cassette so you don't chump up the shifting.
You may have to adjust the brakes based on differences in rim width.
"I feel like my world was classier before I found cyclocross."
- Mandi M.