3.5" of Backspacing ok?

[Drahcir495]

I found a set of Centerline rims that are 15x8 with 3 1/2 inches of backspacing. I want to run 33x12.5" tires. What problems could I run into? Should I stick to a rim with 4 or more inches of BS? Anyone running 3.5" bs? - Rich

[DirtyComanche]

It'll work with a 33. Quite well. I'd struggle to recommend 4" (or more) BS as you'll probably rub the CAs at full steering.

 

 

 

Be wary of fender flare laws.

[speed_racer]

youre in fl, run 3.75" BS or less, it's what I do... We don't really get hassled down here... shoot, Ill be rnning full widths fenderless soon! haha

[87manche]

I run with 3.75, lots of clearance.

With a tire that wide it's going to get into the fender.

[fiscus]

I'd be most worried about a 12.5 tire on an 8" rim.

The backspacing will be fine though.

[Pete M]

I'd be most worried about a 12.5 tire on an 8" rim.

 

:???:

[feerocknok]

I'd be most worried about a 12.5 tire on an 8" rim.

My dad always says that too. I said I had 10.5s, he suggested a 10" wheel. Most of his suggestions and comments are very good/informative, but I don't get this one... I definitely think an 8" wheel is good for a 12.5. Less chance of blowing a bead.

[fiscus]

I'd be most worried about a 12.5 tire on an 8" rim.

 

:???:

 

I thought that for 12.5 or 13.5 tires you were supposed to run a 10" rim?

That way there's less stress on the sidewalls. (and run an 8" rim for 10.5 tires?) At least that's what I've always went with... am I wrong?

[Pete M]

An 8inch rim holds the beads on the tire waaaay better then a 10 inch when you air down. I've never heard of anyone having a sidewall issue with 12.5s on an 8" rim. :hmm: Sometimes you have to pay attention to the air pressure on the street to make sure you get even wear on the tire.

[feerocknok]

It seems to be a semi-common thought that a 12.5 should be on a 10" rim, and I'm curious where the idea came from. I'm not trying to insult you or anything, fiscus, but I've been curious. My father, you, and someone else have all mentioned this in the last month, so maybe it's about tire wear?

[87manche]

it is about tire wear.

with a narrow rim you bulge the top of the tread, so you have to adjust the tire pressure accordingly.

The best thing to do is put a chalk line across the tread, then adjust tire pressure until the chalk line wears evenly off.

 

That being said, I'd rather have a rim too narrow than a rim too wide. I've got chronic bead problems with my 15x8's and a 9.5" wide swamper, but that's how I bought them used, so I gotta buy new wheels or deal with it.

Having a wider tire on a narrow rim also protects the rims and the tires bead area.

[DirtyComanche]

it is about tire wear.

with a narrow rim you bulge the top of the tread, so you have to adjust the tire pressure accordingly.

 

 

 

Yar. And because of that tire manufacterors and (more importantly) tire shops often have charts which stipulate what size of rim you need for a given tire - and they won't always allow a deviation from the chart. Which can cause headaches.

[Pete M]

Yup. And it sure is convenient that most 12.5" wide tires list a 8.5" wide rim as the narrowest they recommend. Who's ever heard of an 8.5" wide rim? And what makes them think that extra half-inch really matters. bastards.

[Drahcir495]

Yup. And it sure is convenient that most 12.5" wide tires list a 8.5" wide rim as the narrowest they recommend. Who's ever heard of an 8.5" wide rim? And what makes them think that extra half-inch really matters. bastards.

The hellcats are 8.5 wide, and the Walker Evans. Thanks for all the input.

[Pete M]

Learn something new every day. :D