Can scalloped tires cause unbalance?
07-31-2009, 01:38 PM
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Can scalloped tires cause unbalance?
I'm tried to balance my rear wheels twice and was told by the first shop the rears were out of round. I didn't really consider this an issue until I noticed a vibration above 75mph. I decided to take it to another place to try and balance the rears again, they balanced it without saying anything so I assumed its all good. However, the vibration is still there if not worse.
I did notice the tread wear is cupped/scalloped, can this be the cause of the imbalance? I hope the rim isn't bent because there are zero signs of visible damage.
I did notice the tread wear is cupped/scalloped, can this be the cause of the imbalance? I hope the rim isn't bent because there are zero signs of visible damage.
07-31-2009, 04:50 PM
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Originally Posted by mister x,Jul 31 2009, 06:09 PM
IIRC badly cupped tires can oscillate at certain speeds resulting in vibration.
08-01-2009, 02:01 AM
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If something was out of balance, you'd feel it all the time, not just under high speeds. It seems to me that you and I (also have the same problem) have the classic symptoms of CV pitting. Our cars rear axles are notoriously known for the CV's to get pitted on the inside and cause a vibration that is present either under acceleration or high speeds.
Is option 2 worth it?
Read up here -> https://www.s2ki.com/forums/index.php?showt...&#entry10548518
**T1R 2-piece half-shaft spacers are my next purchase.
Originally Posted by negcamber
You have 2 reasonably priced options:
- 1) Swap the CV buckets from driver's to passenger side and vice-versa. This costs time and requires some mechanical skill (if you installed your own coil overs you can probably tackle it).
- 2) Install 2-piece half shaft spacers. They'll cost $150-200 There are also 1-piece spacers that are cheaper, but they take nearly as much time to install as it would to swap the CV buckets...and that is free.
- 1) Swap the CV buckets from driver's to passenger side and vice-versa. This costs time and requires some mechanical skill (if you installed your own coil overs you can probably tackle it).
- 2) Install 2-piece half shaft spacers. They'll cost $150-200 There are also 1-piece spacers that are cheaper, but they take nearly as much time to install as it would to swap the CV buckets...and that is free.
Read up here -> https://www.s2ki.com/forums/index.php?showt...&#entry10548518
**T1R 2-piece half-shaft spacers are my next purchase.
08-01-2009, 10:07 AM
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Originally Posted by NightRider,Aug 1 2009, 05:01 AM
If something was out of balance, you'd feel it all the time, not just under high speeds. It seems to me that you and I (also have the same problem) have the classic symptoms of CV pitting. Our cars rear axles are notoriously known for the CV's to get pitted on the inside and cause a vibration that is present either under acceleration or high speeds.
Is option 2 worth it?
Read up here -> https://www.s2ki.com/forums/index.php?showt...&#entry10548518
**T1R 2-piece half-shaft spacers are my next purchase.
Originally Posted by negcamber
You have 2 reasonably priced options:
- 1) Swap the CV buckets from driver's to passenger side and vice-versa. This costs time and requires some mechanical skill (if you installed your own coil overs you can probably tackle it).
- 2) Install 2-piece half shaft spacers. They'll cost $150-200 There are also 1-piece spacers that are cheaper, but they take nearly as much time to install as it would to swap the CV buckets...and that is free.
- 1) Swap the CV buckets from driver's to passenger side and vice-versa. This costs time and requires some mechanical skill (if you installed your own coil overs you can probably tackle it).
- 2) Install 2-piece half shaft spacers. They'll cost $150-200 There are also 1-piece spacers that are cheaper, but they take nearly as much time to install as it would to swap the CV buckets...and that is free.
Read up here -> https://www.s2ki.com/forums/index.php?showt...&#entry10548518
**T1R 2-piece half-shaft spacers are my next purchase.
As far as an unbalanced wheel, a slight imbalance is only noticeable at high speeds so its not necessarily all the time.
An interesting thing I noticed today was how my car behaved with this new wheel/tire combo. The RPF1s are fine but I have Kumho Mx on front and Cooper Zeon in the back. When I'm driving 60mph I jerked my steering wheel from left to right and the car just doesn't feel planted, it would settle and wobble slightly. When I did this with my OEM wheels and Fuzion ZRis all around, the car felt completely planted and stable.
This issue is baffling me so I just bought a full set of Hankook Ventus V12 Evos, its a bargain for the performance (C&D did a test in July and ranked these 2nd out of a line up of ) and there is a $50 off coupon. I'll let you guys know if this issue is resolved once I get the Hankooks mounted.
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