Originally Posted by
WhyFi
You're missing the most important point - it's not that they're showing a 3mm difference over a 6mm rim width difference, it's that they've provided *any* measurement for a specific rim width. Measured width for a given nominal can very significantly across manufacturers and lines. Until two or three years ago, most manufacturers didn't even bother to state their reference rim width. This is very much a move in a better direction.
Well my point is why is that 3 mm difference that only gives 1.5 mm difference in clearance to the frame important? Most people keep more clearance than that from the tire to the frame, so if a 1/4" was my normal clearance I tried to keep, I'm not going to be worried if it's now suddenly only 4.85 mm instead of 6.35 mm.