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18 vs 19 inch rear?

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What are the differences between the two? I know that most trailbikes run 18s and MX bikes run 19s but why? I'm just wondering because I'm building a set of dirt wheels for my DRZ SM and want to know what size rear I should go with.

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Go with 18". More sidewall on the tires and AFAIK a greater tire selection.

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why do MX bikes run 19s then?

19" tires are lighter, handle jumping better, and have better traction in the groomed terrain of an MX track...An offroad tire needs the extra sidewall height to soak up roots,rocks, ruts etc...

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19" tires are lighter, handle jumping better, and have better traction in the groomed terrain of an MX track...An offroad tire needs the extra sidewall height to soak up roots,rocks, ruts etc...

Hmmm.... I've always wondered about that. Good to know.

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