i just bought some motegi dp12 17x7 +42 offset. i have 205/50/zr17 sumotomo tires.
now onto the bad stuff. when ever i hit the brakes the steering wheel, brake pedal, and car shake bad. ive already re tightened the lug nuts.

 

have you had the car aligned? since u had them put on????? if not u should pay the 50 bucks and have it aligned u changed the weight of the car quit a bit and it threw my alignment off wen i put my 17's on i had it aligned and after that had no probs.......

 

wheel alignment, balancing, also if they are directional tires make sure they are in the right direction

 

This is an easy trouble shoot. First, who did the job? Were the wheels balanced? You should not need an alignment with new wheels and tires.

 

if the weight is changed good chance it will need alignment

 

thats what I was thinking ^^^

 

alright thanks guys my dad mounted them he has a shop. they are directional and on the right way. i have not had them balanced but i did not think this was the problem since it only happens during braking. but my dad is going to trade cars with me and fix the problem for free. he said that he owes it to me for not having it perfect the first time.

 

when I got my wheels from wheelmax.com, they were supposed to be balanced. I took them in after installation because I was having the same problems as you. Balance was way off. They peeled off almost all the weights and rebalanced 3 of the four wheels. I had to send wheelmax the bill but they paid it, no problem. Very nice to deal with.

 

No need to look any further. They need to be balanced. Anybody who mounts a new tire to a wheel knows that is necessary. Strange your dad didn't know that.

While an alignment might be a nice, it would not be a cause of vibration as described. If there was a significant enough weight change, it would only effect tire wear. It wouldn't cause any vibration.

 

its not that he did not know that its just that he wanted me to drive a little and he didnt have the machine(he mounts 18 wheeler tire and rims but has a automotive mount, but no machine). but i guess now i can sleep knowing that it is just that.

Thanks yall guys rule

 

mine were balanced, but my car shakes a bit, only when the 18s are on, not my stockers, maybe i should have mine rebalanced

 

Hub rings.

 

what about warped rotors. would that cause this vibrating??? i only have 3500 miles.

 

He better fix it for free HES YOUR DAD!

 

Just to throw this out, If your wheel lugs aren't torqued correctly, while braking your car can vibrate.

 

^^^^^whell lugs are torqued correctly. (that was the first thing we checked)
does anyone know if rotors are covered under warranty and if so can i just go to GM and have them do something with it???

 

i don't know about on cobalts, but when i removed my stock wheels I had these wierd little clips that were on the lug nuts...I forget the reason why they were on there but with aftermarket wheels they caused vibration.

A guy at a tire place recognized them, removed them and the vibration went away.

 

Yes they are covered under the bumper-bumper warr. it's also a saftey issue. Get it fixed

 

Yeh, my base balt has 2 little silver rings on the wheel studs for each tire...If you haven't removed them yet, do so...

 

I have to take mine to the dealership to get it fixed because my brake pads have cut grooves in my rotors. Every time I brake I get a bad vibration.