Originally Posted by SteveO
If you want to keep the rear mud-flap (black) in good shape, I would suggest you remove it. The trials tire is taller than most dirt-bike tires, and will eat through the black flap just behind the rear shock... don't ask how I came to know this wonderful information.....
I wouldn't want the rear tire throwing stones at my shock, one little chip on the shaft and you've got a lot more expensive problem on your hands than a $10 mud flap....
Why not just move the wheel all the way back in the swingarm with the right combination of gearing and chain length?