15X7 w/4in BS Tire Size Question

[TheDartSide]

Anybody know what is the biggest tire I can run in the rear of a 69 Dart using 15X7 with 4in Back Space? Looking to run BFG Radial T/A's

 

[67dartgtgo]

Tire 1 245/60/R14
Tire 2 245/50/R15
(Examples: 285 / 75 R 16 or 33 X12.50 R15)


Tire 1
Tire 2
Diameter
25.6 in.
24.6 in.
Width
9.65 in.
9.65 in.
Sidewall
5.79 in.
4.82 in.
Circumference
80.3 in.
77.4 in.
Revs/Mile
789
819


Use this link to mix and match comparisons
http://tire-size-conversion.com/tire-size-comparison/




Here's a quick comparison.
I ran 245/60/14's in my '67 before I had my narrowed 8 3/4 with an offset spring kit and they were the widest tire I could get in there without rubbing. I now run 275/50/15's and they're awesome.
I believe in this case with a stock rear end, spring placement and wheel openings, width will be your limiting factor without any modification.
...Brian

 

[rrvolare]

I just did it .... ONLY thing different from your wheels and mine... i have sbp 15X7 .... and my off set if 4 1/2.... I have NO issues with 255-60-15... I think you MIGHT/MAYBE have issues with ONLY a 4 inch back space.... MINIMUM 4.25 backspace to make these tires work ... I don't think 275-60-15 will work unless you alter spring location ... hope this helps

 

[Oklacarcollecto]

Some people roll the lip on their fender well to get wider tires under the car. 245 is a size a lot of members run.

 

[TheDartSide]

Thanks for the replies, guys. That's what I thought.

 

[TheDartSide]

what about 245/60/15???

 

[rrvolare]

This is what you need to do ... go to a Discount tire or equivalent tire place and request a worn out used tire of your choice .... have them mount it on your rim and try it ... I am NOT sure what will work with 4 inch back space ....

 

[TheDartSide]

Ok these wheels are going back getting them with 4.5 BS.

 

[rrvolare]

4.5 backspace will gurantee 255-60-15 working on STOCK 8 3/4 setup ... attach photos once you get them installed ...

 

[74DartSwinger360]

With 15x7 and 4 inch backspace my 225-60-15 are very close to the lip and will be getting rid of them.
That is with a factory spec a body 8 3/4

 

[TheDartSide]

Wheels went back! Now where can I find or have made Steel Wheels 15X7 w the 4.5 BS?

I know they will build them @ stockton wheel but $155ea plus shipping and unfinished? anywhere else to get them or anybody have a set laying around?

TIA

 

[autoxcuda]

Are you running small bolt pattern original axles? Including original axle re-drilled for LBP?

OR aftermarket or shortened large bolt pattern axles?

With small bolt original axles, I've run 4.25" backspace rallyes with 245/60/15 on my 68 Dart. Close on inside and outside with a very low leaf spring worn out rear end.

LBP aftermarket/shortened axles move the axle flange out 1/4" or so. Then you will need 4.5 backspacing.

 

[2 Darts]

Are you running small bolt pattern original axles? Including original axle re-drilled for LBP?

OR aftermarket or shortened large bolt pattern axles?

With small bolt original axles, I've run 4.25" backspace rallyes with 245/60/15 on my 68 Dart. Close on inside and outside with a very low leaf spring worn out rear end.

LBP aftermarket/shortened axles move the axle flange out 1/4" or so. Then you will need 4.5 backspacing.

I'll add to these questions, which front brake are you using. With the 75 BBP disk brake setup I've tried a 255/60-15 (does not work), 235/60-15 (works with fenders adjusted outwards), 205/60-15 (no problems at all). The first two were attempted using 15x7 cop car wheels, the latter with 15x7 Magnum 500s. All wheels 4¼ inch back spacing.

At the rear, the 255/60-15s were less than ¼ inch from the leaf spring. The other two fit with no problem at all. The axle was an A-body 7¼ BBP.

Hope this is helpful.

 

[rrvolare]

STOCKTON .. only place i know.... YES expensive ... Too bad you want 15 inch .. i have 14 inch stocktons done and will fit 245-60-14 tires no problem...