Redlines on a TR6 is like p-nut butter & jelly on a sandwich they just go together. The quickest improvement you can experience on a 6 is better quality rubber, with that said the factory issued, skinny, death defying 185/15 (5") lasted forever but proved to be horrible for handling, had 'em 21 years on my 6, 2003 went with coker classic 205/78/15 (5-1/2") vastly improved rubber compound, substantial improvement in handling, pret'ne'r same in height and 1/2" wider than 185's which enables more rubber on the road and could get 2 fingers between top of tire and fender, important for those off camber tight turns to insure no tire rubbing, the last 4 yrs been running the diamondback redline 205/70/15(6") thus far prove to be the best match, look great on the 6, Redline, 6" rubber on the ground, modern rubber improved handling, pass the 2 finger test and absolutely no tire rub under numerous driving conditions as well as not lowering my 6, oh, and did I mention that sour high pitched squeal us 6 owners became accustomed to with the 185's-GONE! as with the no grip, hard ride, the speedo does read 3-4 mph slower. Looking to get another set in the near future to do the replace the current fronts with rears, new on the back rotation
ps
one tire shop stated new tires on the back, in the case of a blowout you're more apt to loose control of vehicle with blowout on rear as opposed to front? so they're instructed to mount new tires on rear, obviously not understanding we're trying to extend tire life as various LBC suspension problems eats up rubber, owning our LBC for longer than some them have been on earth don't really think they grasp the scenario