Hey man, not sure where you saw the info that the 85 250r came with 22" tires in 85, but it did not. The 85R came with 20 x 10" wide dunlops, and in 86 got switched to ohstus, but remained the same size on 9" rims. This is evidenced in this brochure
http://www.3wheelerworldforums.com/B...85atc250r.html
and also in many mags, but also in the fact that the gearing on the sprockets remained constant between 85 and 86. 84 had a 22" x 11" wide on a 8" rim. If I had a 84 I'd definately switch to a 20" tire, it would make the bike handle alot better.
73 cr250m elsinore, 85 atc70, 85 250r flattracker, 87 250es bigred, 86 tecate, 2004 gas gas de300