C2 Cup Wheels
10-22-2018, 11:48 PM
#1
Safety Car
Thread Starter
Member Since: Nov 2005
Location: Lompoc, CA. Santa Barbara County
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C2 Cup Wheels
I really want a set of chrome Cup wheels for my 427 Vert. But I just read a magazine article, Motor Trend I believe, where the long term C7 Grandsport with 40,000 miles had all of the wheels bent out of round. Is there a weakness with these wheels? I sure like the look.
Bee Jay
Last edited by Bee Jay; 10-22-2018 at 11:56 PM.
10-22-2018, 11:58 PM
#2
Racer
I've seen threads complaining about weak C7Z wheels. The Cup wheels shown are from the C6Z/GS and have not heard about issues. They are on my short list when I upgrade wheels next spring.
10-24-2018, 07:43 PM
#6
Team Owner
Friend is on his 3rd set of c7z wheels. Tons of issues with them cracking. I would avoid them if possible.
10-24-2018, 09:01 PM
#7
Melting Slicks
10-26-2018, 01:01 PM
#8
Drifting
I have about 6k miles on my Cup wheels and have had no issues. However, I have a friend with a C7Z and he had three bent wheels and one cracked when he had the shop check them last week. Luckily he had bought the wheel protection package so he got reimbursed for a new wheel and the straightening of the other 3.
10-26-2018, 01:36 PM
#9
Safety Car
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Member Since: Nov 2005
Location: Lompoc, CA. Santa Barbara County
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I was going to insist on factory oem wheels, but maybe the reproduction cup wheels is the way to go. I cannot believe GM is still having supplier quality issues. Now the wheel problem is noted in a major magazine road test.
10-26-2018, 11:16 PM
#10
Melting Slicks
I'm not sure, but there are certainly more C7s with the 19/20 combo than any other generation so more likely to have issues. And who knows if GM switched suppliers and the quality is not the same as the C6 Cup wheels.
10-27-2018, 08:27 AM
#13
Team Owner
Blaiming it on the rubber band sidewalls is a bit short sided, since there are TONS of good rims that hold up just fine with those tires/sidewalls. The rims simply are not built strong enough for the tires and application.
10-27-2018, 10:37 AM
#14
Sure - you certainly are not wrong. BMW and other german cars also have this issue and ofcourse have the rubber band sidewall specs.
It is difficult to build a rim strong enough (while remaining light) to handle the impacts of city driving when you are running without the help of sidewall damping.
Which rims are running without issue as an apples to apples? I am curious myself.
It is difficult to build a rim strong enough (while remaining light) to handle the impacts of city driving when you are running without the help of sidewall damping.
Which rims are running without issue as an apples to apples? I am curious myself.
Last edited by Apocolipse; 10-27-2018 at 10:38 AM.
10-27-2018, 11:52 AM
#15
Melting Slicks
Last edited by MYCoupe; 10-27-2018 at 11:54 AM.
10-27-2018, 11:55 AM
#16
Team Owner
Any decent quality wheel. Forgeline, BBS, etc etc. If GM can't design a wheel to use that tire and conditions, then they should pick a different tire, or spend the extra $50 on a forged wheel or design the wheel for heavier loads with a higher quality material or thicker walls. This is a simple design issue.
10-28-2018, 01:02 PM
#18
Sure - you certainly are not wrong. BMW and other german cars also have this issue and ofcourse have the rubber band sidewall specs.
It is difficult to build a rim strong enough (while remaining light) to handle the impacts of city driving when you are running without the help of sidewall damping.
Which rims are running without issue as an apples to apples? I am curious myself.
It is difficult to build a rim strong enough (while remaining light) to handle the impacts of city driving when you are running without the help of sidewall damping.
Which rims are running without issue as an apples to apples? I am curious myself.