cycles per second
Join Date: Oct 2003
Bikes: Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
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Most MTB rims can handle 26x1.5 unless it's something like a Surly Pugsley with Large Marge rims (65mm wide!). I put Ritchey Tom Slicks 26x1.4 on mine (~28mm wide rims). I think the RM20 is ~25mm wide so you can go down to 26x1.5 with no problems. 26x1.25 should even be possible, but 26x1.0 is probably too narrow.
Last edited by Gonzo Bob; 01-28-09 at 06:28 PM.