Putting 305s on OEM Boss wheels

[Wile E. Coyote]

Question for you experts out there, I just picked up a set of Toyo R888s for a trial run on my Boss the front being 235,35,19 and reader being 305,30,19. Looking fat! However I have a concern about the rear ones. The first tire shop I went to couldn't get the bead to set because the tires call for a 10.5 to 11.5 inch wheel, and the Boss wheels are 9.5. The second place I tried to buy new widers wheels, however they managed to mount and balance the 305 on the rear. Is it dangerous or stupid to have a tire requesting 10.5 to 11.5 on my 9.5 wheel. Keep in mind my Boss is supercharged with a little over 700 horses and I do race occasionally. I will post pictures of the rears when I get home. Thanks guys!

 

[Jabooh1]

When you force a wide tire on a smaller than called for rim you are not gaining contact patch. Since the sidewalks have to bend in so much you are "peeling" up the contact area at the edges and not taking advantage of the width of the tire.

 

[Wile E. Coyote]

I report back to Japan in two weeks. Is it ok to drive on till the new size comes in?

 

[86Fbody]

I report back to Japan in two weeks. Is it ok to drive on till the new size comes in?

I am interested to see what someone says, I don't think you will get an answer to that.

 

[Wile E. Coyote]

From everything I've found online it's mixed answers.

 

[el jefe 302]

It's mixed answers because its not a good idea. If you take corners too fast you could break the bead seal on the tire.

 

[86Fbody]

It's mixed answers because its not a good idea. If you take corners too fast you could break the bead seal on the tire.

This, I don't think anyone here would tell you it's a good idea in good conscience.

 

[darreng505]

From everything I've found online it's mixed answers.

It's mixed because there's right answers and then there's always the 'I did it and nothing bad happened therefore it's ok' answers.

 

[Wile E. Coyote]

The only thing I'm concerned about is I have drive to Pensacola from Arkansas this weekend I've orderd wider wheels but they won't get here till Monday

 

[Dizzyscure1]

I wouldn't do it.

 

[_Snake_]

Agree with everyone else that it's not worth the risk. Especially for that long of a drive.

.

 

[Wile E. Coyote]

Swapped the rubber over, I'll mount the 305s on the wider wheels I ordered. The new wheels are 10.75 in the rear, should be good!

 

[IamRacerX]

I run a 305 on a 10.5 rim and it works great. The 285 rear on the stock 9.5 is max width for the stock rim by the book. The 305 on the 9.5 could in theory be done, but handling and tire wear would be an issue.

 

[legos_mustang]

I wouldn't. It's a bit too much out of limits. 285s on a 9.5 are already at the limit. While you would get better performance out of a 305 with the right wheel, on a 9.5 inch rim, you are not. Heat is not going to build up and dissipate correctly, neither will the sidewalls fold up as well when turning. Finally you risk the chance of a blowout at high speed basically just for looks.