How Much Frame Notch to Fit 15x10’s?

D

dustin72

Not-quite-so-new-guy
Aug 21, 2016
15
0
1
#1
I’m purchasing some new wheels for my ‘80 Malibu and will be going 15x10 with 5.5” BS. How much are you guys notching the frame to fit? To the seam or farther? I don’t want to take out more material than necessary since I won’t be running a cage.
 
UMI Performance

UMI Performance

Master Mechanic
GBodyForum Sponsor
Jul 9, 2011
341
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Philipsburg, Pa
#2
That is tough, that could possibly clear with out notching. But for notching you want to notch the frame back until it is even with the inner wheel wells. Going deeper won't help because the inner wheel well is in the way. We the UMI kit we run a 11" wheel and 315 tire on a 79.
 
motorheadmike

motorheadmike

Comic Book Super Hero
Nov 18, 2009
2,879
4,774
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Ottawa, Ontario Canada
#3
That is tough, that could possibly clear with out notching. But for notching you want to notch the frame back until it is even with the inner wheel wells. Going deeper won't help because the inner wheel well is in the way. We the UMI kit we run a 11" wheel and 315 tire on a 79.
Unless you are going to move the wheel tub inward too. Best to do it once and do it right. When we did the wagon we installed all new inner tubs despite only notching to the seam on the frame. All that to say the issue isn't the width of your wheel it is the section width of your tires once mounted; not to mention the backspacing of your wheels, the diameter of your tires, and vehicle ride height. So, if you are at stock ride height, with 26" tall tires, and a reasonable offset it isn't going to matter as much as being slammed, on 30" tall tires, with lots of negative offset.

There isn't a one size fits all answer to this, just a lot of rule of thumb.
 
D

dustin72

Not-quite-so-new-guy
Aug 21, 2016
15
0
1
#4
I have 275/60/15 on 15x8’s with 3.5” backspacing now. Fender lips are rolled. Going to put the 275’s on the 15x10’s until they’re worn out then going to 315/55/15’s. I won’t be modifying the tubs.
 
D

dustin72

Not-quite-so-new-guy
Aug 21, 2016
15
0
1
#5
Car sits about 2” lower than stock. About 3/4” of tire tucking in the well.
 
565bbchevy

565bbchevy

Geezer
Aug 8, 2011
5,590
4,493
113
Michigan
#6
I would notch the frame so it is flush with the inner wheel tub and from there I would do some mock ups to see what you can actually fit before ordering rims.
With a 2" drop on a 15 x 10 with the right backspace might fit but I feel a smaller tire would be needed to provide enough clearance.
I am not sure who's tire you are looking at in a 315/55R15 but it will have approx 13" of section width and that will be the issue.
 
R

RG383Hurst

Not-quite-so-new-guy
Mar 7, 2015
36
91
18
#7
I wouldn’t notch past the inner tub unless you are going to widen the wheel tubs. My notch is to the edge of the spring bucket with tubs widened 2.5”. 15x10 welds 5.5bs with 295 55 15 MT dr’s, 2” UMI rear drop springs and modified fender lips. Car sits just on top the tire. Notch is wide enough to fit 325 50 15 dr’s on same rim with 3/4” clearance to frame. Not sure the 325 will tuck in fenders with the 5.5 bs. This is on a Cutlass, hope this helps out.
 
D

dustin72

Not-quite-so-new-guy
Aug 21, 2016
15
0
1
#8
I would notch the frame so it is flush with the inner wheel tub and from there I would do some mock ups to see what you can actually fit before ordering rims.
With a 2" drop on a 15 x 10 with the right backspace might fit but I feel a smaller tire would be needed to provide enough clearance.
I am not sure who's tire you are looking at in a 315/55R15 but it will have approx 13" of section width and that will be the issue.
Sorry, I meant 295/55/15. Should be 0.8” wider section width than the 275’s I have now.
 
D

dustin72

Not-quite-so-new-guy
Aug 21, 2016
15
0
1
#9
I wouldn’t notch past the inner tub unless you are going to widen the wheel tubs. My notch is to the edge of the spring bucket with tubs widened 2.5”. 15x10 welds 5.5bs with 295 55 15 MT dr’s, 2” UMI rear drop springs and modified fender lips. Car sits just on top the tire. Notch is wide enough to fit 325 50 15 dr’s on same rim with 3/4” clearance to frame. Not sure the 325 will tuck in fenders with the 5.5 bs. This is on a Cutlass, hope this helps out.
That helps a lot. I meant to say I will be running 295/55/15 m/t drs. Running the 275’s now. It sounds like your car sits like mine.
 
565bbchevy

565bbchevy

Geezer
Aug 8, 2011
5,590
4,493
113
Michigan
#10
Sorry, I meant 295/55/15. Should be 0.8” wider section width than the 275’s I have now.
Your 275/60's on your 8" rims should have a section width of 11.1" the 295/55 should be at 12.1 on a 10" rims but should still have no problem fitting .
I have M/T 295/55 on a 9.5" rim with plenty of frame room and the tires are tucked in even the section width doesn't stick out and I also ran M/T 295/65 but decided they were too tall.
 

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