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Old 07-17-2021, 09:42 AM   #1
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LCA Rubs Inner Wheel

I have a 2010 SS with quite a bit of BMR rear suspension products. The issue Iím having is my lower control arms (TCA028) rub the inner wheel of my 17Ē Weldís both on the dyno and on hard launches. This has happened on three separate occasions that I can recall, despite the clearanced section that is designed into the LCA. The car also has trailing arms, toe rods, subframe connectors, rear cradle bushings and rear DA coilovers. Iíll add some pictures as well but Iím curious if anyone else has ran into this and what might resolve the issue.





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Old 07-17-2021, 12:14 PM   #2
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Images don't show when clicked. May want to attach them....

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Old 07-17-2021, 12:21 PM   #3
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It's tough to see in those pics. All but the last one looks fine. Have you replaced the bushing in the knuckle too? What offset wheels?

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Old 07-17-2021, 02:47 PM   #4
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Iíll try attaching the pictures on this post reply and see if that works. Looking really close, the LCA is rubbing right on the lip of the inner wheel and taking a little bit of material off. The wheels are 17x10 Weld S71ís and while my receipt doesnít list a backspacing, looking at their website it looks like 7.8 is the likely number.
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Old 07-19-2021, 05:39 PM   #5
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I thought of a few things I thought Iíd get some opinions on.

1) Would it make any difference if I swapped the LCAís to each other side?
2) Would it be advisable to grind down the area of the LCA that is making contact for clearance? (Really donít want to sacrifice any integrity)
3) Should I go with a different LCA and if so, what would be the suggestible options?
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Old 07-19-2021, 06:07 PM   #6
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Can you get a pic of the mark on the LCA? I'm only seeing a scrape on the rim

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Old 07-19-2021, 08:42 PM   #7
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Itís a little difficult to get a good view from the angle itís at but I tried to clean up the area a bit and get as good as I can with my phone. Hopefully this helps some. Iíve got a few of the LCA and a few of where it chewed on the wheel lip.
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Old 07-21-2021, 02:46 AM   #8
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SO, how WIDE are the 17" rims?
These arms are also shorter than the OE arms.

The toe angle is being changed under acceleration. If the whole arm moved back
with the wheel, it would not hit.

You may have a bad bushing somewhere, and the knuckle spherical bushings are
the weak spot. The spherical bushings are Upper and Lower control arm @ the knuckle,
and inner UCA bushing @ the cradle. I recently replaced my knuckles because they
were bad, and I have UCAs to go on because those sphericals are bad.

Last edited by AlanRubin; 07-21-2021 at 05:59 PM.
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Old 07-21-2021, 02:10 PM   #9
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well, the back spacing is crucial in this situation. If you have a 7.8 back space 17x10 thats a fitment for 4th gen Fbody camaro's and C5 corvettes, i own both of them.

7.2" back spacing is the correct sizing for a gen 5 camaro. Weld Rts series has a fitment catalog you just have to match part numbers to what you actually have.
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