I have been thinking about this mod for a long time. I'm not convinced there would be clearance issues. I'm running 140/80 17 and have at least 2.5 inches of clearance at the swingarm. The wheel could also come back another half-inch with a longer chain. The Bitubo/Twalcom race bike has 18" Excel's mounted but detailed info on that bike seems unobtanium.
An additional consideration is ABS. For those of us with ABS bikes the computer may think that the rear wheel is locking us as it would be spinning slower than a 17". Would love to hear if anyone has encountered this or heard of a fix (besides ordering the bike without ABS). the 140/80 I put on instead of the 150/70 has a greater circumference than stock and that has not had any effect but I could just be within some sort of acceptable range.
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Bartron screwed with this post 10-18-2009 at 10:33 AM