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Old 07-19-2013, 06:12 PM
Mitchman's Avatar
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Wheel setback, check me on this.

'34 Ford.

As you can see, I've got 5" from drum to fender and 5 3/8" from drum to body. I plumb-bobbed it.

Assuming I'll leave that 3/8" for clearance I'm left with 10". If I leave 1" for tire sidewall bulge can I order an 8" wide rim with a 4" backspace (0" offset) and be safe?

For example, if I go to 7" (to allow for 1.5" tire bulge), do I then get a 3.5" backspace (0" offset)?

0" offset centers the wheel/tire on the drum's face, correct?

What width tire for either of these? I'm looking to stuff the rear fender with tire. Hot Wheels style. PHAT tires in the rear! PHAT PHAT!! Mid-life crisis PHAT. Pic from Rodder's Journal #48. E-T Classic V wheel.

I'm thinking 15x6 (or 7), 195/60 in front, 16x8 (or 8.5), 255/70 in rear.... ??


We used factory stuff waaaaay back in HS, never even thought about this stuff back then.
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Last edited by Mitchman; 07-19-2013 at 06:32 PM.
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Old 07-19-2013, 06:43 PM
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Here ya go, Mitch. I just found this on the innernut cause' I was thinking about the same stuff for my car. I'm putting this in my favs!!!

Custom rims, wheel tire packages for your ride - RIMSnTIRES.com
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Old 07-19-2013, 07:11 PM
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Quote:
Originally Posted by evolvo View Post
Here ya go, Mitch. I just found this on the innernut cause' I was thinking about the same stuff for my car. I'm putting this in my favs!!!

Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

Oh, nice find.

That's odd. If I dial in 8" wide, offset 0" it gives me a backspace of 4.5".

Why isn't the backspace 1/2 of the width?

To get the wheel centered on the hub, I need to dial in a -.5" (-12mm) offset.
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Old 07-19-2013, 09:26 PM
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This just came thru. I didn't expect an answer till Monday at the earliest


Hi Alan,

Backspacing counts also rim lip.
8 in your sample is inner rim width work area for mounting tire.
Actual rim width including lips will be around 9.

Thank you for your interest.
Best Regards,
Boris Kantemirov.
408-315-3897 (direct)
Custom rims, wheel tire packages for your ride - RIMSnTIRES.com
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Old 07-19-2013, 09:37 PM
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Ah. That's the phantom half inch. Gotta give Boris props for the late-night answer. He doesn't seem to carry E-T. I'll give him a call anyway.

Thanks evolvo.
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Old 07-20-2013, 12:10 PM
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Quote:
Originally Posted by Mitchman View Post
Assuming I'll leave that 3/8" for clearance ...
What are you using for locating the rear axle.. panhard bar, watts link, or ???

3/8" is pretty tight, you may end up with some rubbing issues.
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Old 07-20-2013, 04:49 PM
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Originally Posted by lakeroadster View Post
What are you using for locating the rear axle.. panhard bar, watts link, or ???

3/8" is pretty tight, you may end up with some rubbing issues.
The clearance will be determined by the width of the tire/wheel. I'll shoot for 3/4" to 1" inside and outside. An 8" tire should about do it depending on bulge at the sidewall. The 3/8" is there, but I chose to take it out of the calculation so we could work the math with a clean 10". Yes, I will have more than 3/8" eventually, although I've seen some cars at shows with just barely that.
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Old 07-20-2013, 05:52 PM
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My rears are 15" x 8" with a 4" backspace. My tires are 235/70x15. I have a bit more than 1/2" inner and outer. Stock width fenders on my sedan. I should say my wheels have a 3 3/4" backspace - I ordered them with 4", noticed it was real close on the inside, measured the wheels and they are actually 3 3/4" - so I added a 1/4" spacer.

The height of your rear will also effect your clearance, as your fenders and body side both pinch in a little at the top. The higher your ride height, the more effective clearance you have, assuming your suspension travel is limited.
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