Join Date: Aug 2006
Location: Alexandria, VA
Bikes: Firefly custom Road, Ira Ryan custom road bike, Ira Ryan custom fixed gear
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the snarky answer is to go to your bike and measure...just go from one side to the other, through the wheel as seen from above.
What kind of hubs do you have stock? MTB hud will be spaced 135, road 130. It will almost certainly be one of the two (some bikes are 132.5, in which case you could do either).
I use Mavic open pros as an extra wheelset, with Ultegra hubs. Cheap, strong, good enough for my clydeness (230 or so).