is that the missile kit on the 250r? i seen the kits and they are nice. have you seen that crf450r with the atv tires around the internet that is trick! but for us we need street legal stuff lol! yea playing around with a tw tire would be a good start. i know what you mean by no turning back! i was commited when i grinded my brake tabs off and widened my swingarm. yea i think with a little narrower rim the tw tire will suck in a bit maybe enough to fit on the xr with a little work. i was thinking on a tw rear on the front of my dakar but dont know if i will or not. the tw tire is a good strong dot tire. its rated at over 900 lbs and p speed rated which i think is 96mph or around there.how about the earlier steel xr swingarm as a start? they would be easy to weld and modify.