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Old 07-20-18, 10:43 AM
Bill Kapaun
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Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

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1"=25.4mm, so a 2" would be about 51mm. Closer than "nominal" sizing.

I would expect the 50mm rating might be slightly conservative, not knowing how "aggressive" of a tire that will be used?

You might want him to dig out the ruler and measure where the least clearance is with his current tire and adjust from there.

If a friend has a similar tire mounted, temporarily swap wheels to check. He doesn't need to actually ride it.
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