Rims and tire question

2807 Views 8 Replies 4 Participants Last post by Shots, Feb 16, 2015

Nostuh82

Discussion Starter · Feb 15, 2015

I just bought a set of new rims for my charger and I have a few questions hopefully you guys can answer for me. I probably should have asked these before buying them but too late now. Ok I have a 2010 charger sxt rally edition. Factory tires are 225/60/18, I bought a set of American Muscle 18" rims that are 10" in the back as 9" in the front with a decent offset, don't know the exact. They have Sumitomo 285/35/18 on the rear and 275/35/18 on the front, with a max load at 1521 and 1604 on the tires. I know these will throw my speedo off, I've planned for that I want to know if the tires can handle the weight of the car and if I'm going to have any rubbing or brake problems? I did put the front rim on the car and it seemed to roll and turn fine but had very little space between the inner rim and the caliper. Please let me know what you know. Also what would be the smallest width tire I could put on these re if I have to buy new tires?

Thanks

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Shots

· #3 · Feb 16, 2015 (Edited)

Wow those tires are pretty small compared to stock.

If you clear the calipers now, you're not going to have problems with them in the future, because nothing changes to affect that gap without changing the rim or calipers.

The offset could potentially cause an issue, but that will affect if the rim or tire makes contact with the suspension or fender.

As for the width of the tire you can fit on the rim. That depends a lot on aspect ratio (the second number on the tire). A smaller sidewall is, the closer the rim width needs to be to the tire's width. In any case, the width of the tire can't be narrower than the rim width, or it won't seal. The 10" wide rim is 255 wide, so the narrowest you'll ever be able to fit on that rim is a 255/xx/18.

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Shots

· #8 · Feb 16, 2015 (Edited)

Nostuh82 said:
In regards to tire width for the rim, do you guys think the stock 225/60/ would stretch onto the 10" rim, there is quite a bit of sidewall to stretch out but I know that a 225 is only 8.8 inches but i don't know how it works when you stretch if it would make it.

No, a 225 will not fit. Tires won't "stretch out" to fit a wider rim. They really aren't that flexible. At best, you can go as narrow as the rim width but not narrower. A narrower tire than the rim, would be pulling away from the bead and if you have any loss of pressure the seal would be lost and the tire would immediately deflate (probably abruptly). This would be a very dangerous situation, and potentially catastrophic.

Here's a crappy illustration to give a little more perspective of what you'd be asking the tire to do. Gray is the rim, white is air, and black is the tire. If you're cornering, and putting stress on that side wall, you'd be adding even more force than it already has pulling it away from the rim. It just won't work.
Hate to be the bearer of bad news, but 255 is the absolute minimum width you can safely fit on a 10" wide rim. The front rim that is 9" wide you might be able to get away with a 225 depending on the tire, but that's the smallest you could go on it.