I don't know of any 20" rims with the 5/10 lug and 8.75" bolt pattern that aren't the RH-5's...
You need to be under load (going up hill) to be able to down shift from hi range to low range. You can't practice on flat ground, it will grind. As others have said, start in 2nd low rear and stay there until your in 4th gear and then switch it into hi rear. The only time I don't do it this way is if I have a heavy loaded.
Mike B
