Old 08-05-10, 06:18 AM
KonAaron Snake 
Fat Guy on a Little Bike
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Join Date: Jun 2008
Location: Philadelphia, PA
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Originally Posted by AsanaCycles View Post
MAVIC SpeedCity is a great wheelset
I've used a set for about 5yrs

road wheels are not 29er's
road rims are not 29er rims

road wheels, and rims do share the same effective rim diameter as a 29er

the basic difference is rim width

altho, with a set of SpeedCity's I have used plenty of 29er MTB tyres, all the way up to 29x2.35"
and of course you can go down to 23c

here's a decent set for $170

the thing with using a skinny rim with a MTB tire, and running the tire around 25psi, and riding the bike hard, is that there is a chance that the tire will slide/creep on the rim, which usually pulls the valve stem until it rips.

but if you keep the PSI up, and don't run the brakes super hard, the tires will more than likely stay put.

a wider rim (29er rim), will accommodate MTB tires at lower psi without creeping.
but then you trade off being able to use a set of 23c road tires.
What is the lowest size tire you can use on a 29'r rim?
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