i'd run up the pressure to about 65psi,you dont want a pinch flat in a
race and on a 29er its a big possibilty since the rims are so skinny.

your tyre wont be rolling over at that pressure either,but watch for
jagged rocks since the side walls are made so thin.(slice)

150's are a good idea for offroad,and over all they are faster since its
hard to maintain the top speed that 125's give because the terrain is
always changing in favor of more leverage on the wheel.(whew!)

150 is the limit i'd say anything longer would negate the advantage of
the 29 inch wheel.


--
jagur - Random Unicyclist

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