Slight wobble between 45 and 85mph

Got these Rohana Rc10 wheels. They are 20x9 and 20x11 in the back with Nitto Invo's.

Got them balanced the other day when I had tpms installed. The wheels also have the little hub rings that kind of make them centered. Yet, after all that... the steering wheel shakes left to right between 45 and 85 STILL! Car has only 20k Miles and it's rarely driven... If I switch to my 19's it's all good. No shaking.

Also, I didn't know going from 19's to 20's would make a huge difference in my butt dyno... The car just feel slow now. I know the wheels are heavier, but I didn't think i'd notice that big of a difference.

Any thoughts?

Thanks

Ditch the 20's, they look like wagon wheels on the M3. 18's or 19's are going to give you the best results.

Boostin FD wrote

Got these Rohana Rc10 wheels. They are 20x9 and 20x11 in the back with Nitto Invo's.

Got them balanced the other day when I had tpms installed. The wheels also have the little hub rings that kind of make them centered. Yet, after all that... the steering wheel shakes left to right between 45 and 85 STILL! Car has only 20k Miles and it's rarely driven... If I switch to my 19's it's all good. No shaking.

Also, I didn't know going from 19's to 20's would make a huge difference in my butt dyno... The car just feel slow now. I know the wheels are heavier, but I didn't think i'd notice that big of a difference.

Any thoughts?

Thanks

Road force balanced? It does make a difference. Are the wheels new or used? This car is very sensitive to wheel shake if the setup is off.

Personally, I think the 20s look good, but yeah - it's going to be slower. I think 19 is the sweet spot for this car.

No, not road force... Just regular. The wheels were used... Not bent or scratched etc.

Try the road force balancing as suggested. Are you sure the wheels aren't bent? If road force balancing doesn't do the trick, have the wheels checked for lateral and radial runout. Those wheels are low pressure cast. They are going to be heavy if they really do meet JWL/VIA as the Rohana website claims. There are so many wheel companies. It's hard to know what is worth your money and what isn't. Do you have previous experience with the Rohana brand? There are some concerning aspects to the Rohana website including no physical address listed, stating that they meet JWL and VIA standards (JWL is the standard. VIA tests and certifies to the JWL standard). Hopefully it's just that their syntax is quite right. Many company's just show pretty pictures of their wheels and say soothing things about quality and engineering without claiming to meet any standards.

There are two sticky threads in this forum that provide info on how wheels are made and explain the various wheel standards.
Wheel Manufacturing: http://www.m3post.com/forums/showthread.php?t=357430
Wheel Standards: http://www.m3post.com/forums/showthread.php?t=353224

No need to road force balance as vibration at 45mph indicates something significantly out of balance/round.

Check that the spigot rings are truly hubcentric; they should fit snugly on the hub of the car and so should the wheels, and there should be zero play, and I mean zero. If you can feel any play, then you have just found your cause of your vibration.

I'm almost 100% certain it's due to that.

I have a vibration sticky in the mechanical section for you to check if you want.

are you running spacers? I agree..check everything in regards to hubcentricity.

Thanks guys... the hub-centric rings do fit snugly on... but they are so thin... not sure if they serve any purpose. I'll double check everything again.

Boostin FD wrote

Thanks guys... the hub-centric rings do fit snugly on... but they are so thin... not sure if they serve any purpose. I'll double check everything again.

Do they fit snugly AND make good contact on the hub of the car? Some spigot rings are too recessed into the wheel that they don't actually make contact with the hub-lip, even though they are centric. A photo of the spigot ring on the wheel and another photo of the spigot ring on the hub would be good.

Does the wheel sit flush with the hub of the car as well?

I had the same issue with a supposedly hub centric rims from a vendor on here but long story short was that they weren't. Once I ordered the right hub centric rings all the vibrations went away. My vibrations were at different mph also.

hova00 wrote

I had the same issue with a supposedly hub centric rims from a vendor on here but long story short was that they weren't. Once I ordered the right hub centric rings all the vibrations went away. My vibrations were at different mph also.

Who would know the right size of the rings that I need?

Are the wheels new? If you got them used check to see if they at straight, seem to be an over sight of people running 19's and 20's that unless they are forged they could bend if you hit a pot hole, etc.