I have an opportunity to pick up a Moser 12 bolt housing for pretty cheap that is set up for a 4th gen, but it has been narrowed (stock width is like 57" (I think), this one is 55" from flange to flange). I know some guys have done this, but my question is, what will my wheel/tire combination choices be like? I would like to run a 28" tall tire on a 15" wheel in the future, but what widths and backspacing will work? Or would it be best to go with a stock-width axle?

I appreciate all your replies!

 

What dimension are you quoting...? The stock 10-bolt is 64.72" between axle hub flanges, and 59.24" between the brake mount plates. Strange duplicates those dimensions on their 12-bolt.... I'm looking at their drawing for the dimensions.

But, assuming you are only losing 2" in overall width, you need a wheel with 1" less backspace. For a 15x8 wheel, use 4.5"BS, for a 15x10 wheel, use 6.5"BS.

You can fit a 28" outside diameter tire in the Formula wheel wells (not all 28" tires are actually 28.0" diameter, so you need to check the manufacturers dimensions). I have 28x11.5-15 QTP's and the only problem I had was the tire hitting the body due to "growth" when trap speeds went over 125mph. I think the 28" ET Streets are actually a little less than 28" OD. I already had my inner fenders hammered for 17x11's with 315/35s on them.

 

Thanks for the reply, Fred. That is exactly the info I was looking for. The 55" measurement I had was from brake mounting pad to brake mounting pad (the housing ends with the 4-bolt flange).

When you mentioned your 17x11 wheels, that reminded me that I want to run my stock wheels (or a stock 4th gen wheel) on the street, and I don't want to run a narrowed rear.

Thanks anyway!!