Bottoming out and rubbing - Vintage Mustang Forums
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post #1 of 9 (permalink) Old 07-12-2019, 05:07 PM Thread Starter
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Bottoming out and rubbing

Having issues bottoming out all the time and rubbing.

I think I have only 2 options. Put back a bigger set of springs have some performance lowered ones or change the tire.

Right now p215/60r15. Could try a p205/50r15

But that would lower the car even more. It's pretty common size so has to be the lowering springs

Thoughts? Not sure of the back spacing on the shelby rims
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post #2 of 9 (permalink) Old 07-12-2019, 08:35 PM
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215/60R15 should not rub or bottom out. Perhaps your springs are completely worn out.
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post #3 of 9 (permalink) Old 07-12-2019, 08:48 PM
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I agree 100% with awhtx. It's not the tires. And although the backspacing on those wheels may not be exactly optimal, they aren't that far off either. The clearance in your pic looks good too. Something else is kerflooey and shot springs are the most likely suspects.

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post #4 of 9 (permalink) Old 07-12-2019, 09:12 PM
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Springs and shocks. Weak springs will allow it to move way too much and worn shocks won’t slow this motion down. Bad combination.

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1965 2+2 painted (66) Vintage Burgundy, 1998 roller 5.0 with GT40P heads, plans are for Sniper, T5 and 3:55 rear.
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post #5 of 9 (permalink) Old 07-12-2019, 09:14 PM
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It's all about the right backspace
My car is lowered quit a bit with larger wheels/tires and I don't have that issue


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post #6 of 9 (permalink) Old 07-13-2019, 11:41 AM
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Quote:
Originally Posted by 2nd 66 View Post
It's all about the right backspace

My car is lowered quit a bit with larger wheels/tires and I don't have that issue



What size tires and are you running spacers up front? If so, what size? Thank you


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post #7 of 9 (permalink) Old 07-13-2019, 07:25 PM
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Quote:
Originally Posted by antho View Post
What size tires and are you running spacers up front? If so, what size? Thank you


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the pic shows 17x8 05+Bullitts using a 1.5" wheel adapter making for 4.75ish backspacing which is considered ideal. The tires are 225/45/17(got them free) but I have room for more 235/45/17 for sure maybe 255/40/17 even
the three basics are
15x7x4.25
16x8x4.50
17x8x4.75
of course these cars being built in the millions had pretty loose production tolerances and after 50 years of who knows what, other thing such as alignment specs can make a difference as well


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Last edited by 2nd 66; 07-13-2019 at 07:30 PM.
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post #8 of 9 (permalink) Old 07-14-2019, 11:17 PM
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Bottoming out and rubbing

Thank you. I currently have 235/55/17 on the same wheel with 1.5” adapters. No rub in the rear so I may keep that size but go narrower up front. Thanks for the info.





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post #9 of 9 (permalink) Old 07-14-2019, 11:37 PM
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Quote:
Originally Posted by antho View Post
Thank you. I currently have 235/55/17 on the same wheel with 1.5” adapters. No rub in the rear so I may keep that size but go narrower up front. Thanks for the info.





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55's are a bit tall


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