...as far as a wider swingarm relates to a wider tire, the swingarm doesn't really limit you that much. The front/rear sproket/chain are really where you run into problems. 130/140 tire is where you start to rub the chain. At this point you have to start looking at moving the front spocket out, or off setting the engine. Past a 180 you have to start looking at a jack shaft.

Lumbee (Mark)
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"I'm not a welder, but I play one on HondaChopper.com"

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