315's on 9.5 Rims - Why Not?

[Idaho Slim]

I know that it is highly suggested to not run 315/35Z17's on stock 9.5 rims, but why ? In my searchs I see most say to not run this combo, but I have my drag 315/35Z17 radials on a aftemarket 9.5 rim, and after 20 passes on them at 17 - 22 psi, no issues.

is it because of wandering or what?confused:confused

I attached pics of my drag setup, but at 30 psi on the way home today after the races.

 

[boomdriver]

beats me !

I had 315 x 16 Michelins and would STILL have them if they had'nt been discontinued. They were so wide that the rear view looked like Fred Flintstones car..otfl

Some worry that there will be excess sidewall flex...I just today yanked my car around at about 40 mph with very aggresive 1/3 turns of the wheel (Z-51, only has 3/4 turn to lock) to see how it felt as far as control...I've got 275/40/17 all 4 on there now....it took the sudden harsh steering input 3 times in rapid succession but the 4th time I could easily feel the sidewall flex under those conditions. One more "yank" and the back end would have broken loose... That was extreme, but I do not believe that a 315 would have been any worse and maybe even less depending on the tire brand & tread pattern and compound.These were Yokos today and they are hard as a rock....Not real pleased with these. A softer tire (better tire) might have flexed but still gripped the road surface, even with repeated radical steering input.

I had very slight rubbing of the steering tires on my 315's...but nothing that caused damage or interfered. My 275/17 rubs up front sometimes in full lock turns.

Why they say not to do it?
beats me.:confused

 

[vetteoz]

" Each tire has a specific rim width range on which the tire can be mounted. Failure to follow rim width recommendations may result in poor tire performance or possible wheel and/or tire failure."

Recommended width range for 315/35 is 10" -12" with the middle (11") being the optimum preference