Car shake

[nabzz]

Hi guys, so I own an a4 cabriolet 2006 s line... I changed the standard 18inch alloys to 19inch s5 style alloys.... Looks amazing but at speeds above 80mph the car shakes had it balanced twice still the same the guy at the alloy shop says it might be my bushes... He says the change in alloy size could be highlighting it... Could this be true... I don't get the shakes with the other alloys...

[neilos100]

If you go faster than 80 does it disappear? If so it does still sound like a tyre out of balance.....
Sent from my phone...

[zollaf]

very unlikely to be bushes. as above more than likely the new wheels not balanced properly. you say they have been done twice , by the same person ? if so, try someone else, maybe the balance machine needs calibrating.

[darich]

could be either a flat spot or one one of the wheels slightly out of true.

[warp_speed]

Hi guys, so I own an a4 cabriolet 2006 s line... I changed the standard 18inch alloys to 19inch s5 style alloys.... Looks amazing but at speeds above 80mph the car shakes had it balanced twice still the same the guy at the alloy shop says it might be my bushes... He says the change in alloy size could be highlighting it... Could this be true... I don't get the shakes with the other alloys...

Nabzz, you need to get centreless wheel balancing done. I think it states that in the Audi technical manuals that our cars can't be balanced properly on a cone type balance machine. I have been in this position many times and a guy I know only does centreless because "that's how the wheels are mounted on a car". Its a good point because I've never had a balance problem especially when on holidays in Germany. But always have problems using cone type balancing.

[nabzz]

Nabzz, you need to get centreless wheel balancing done. I think it states that in the Audi technical manuals that our cars can't be balanced properly on a cone type balance machine. I have been in this position many times and a guy I know only does centreless because "that's how the wheels are mounted on a car". Its a good point because I've never had a balance problem especially when on holidays in Germany. But always have problems using cone type balancing.

Warp_speed u r amazing I did not think off this... I'll get this done 2moro

[discobarry]

Out of interest warp_speed, How does everybody else get on with there B7 balancing if they don't use centreless balancing? I balance my own wheels for one with a normal balancer(which also does centreless) and never have any problems.

Maybe your guy just needs to calibrate his machine

[warp_speed]

Out of interest warp_speed, How does everybody else get on with there B7 balancing if they don't use centreless balancing? I balance my own wheels for one with a normal balancer(which also does centreless) and never have any problems.

Maybe your guy just needs to calibrate his machine

It's an excellent point, I asked my wheel balancing guy about this, who told me to ask other wheel balancing places that do centre mounted to run the machine with nothing on it. He was right, they tell me to f off and say its calibrated.

Of course there is the question about how it's mounted on the machine, you can't guarantee that the centre hole is bang on centre especially if the wheels like my ones are reconditioned. Perhaps thats why I have problems. But if you think about it the centre hole is not how a wheel is attached to the car. Perhaps thats why Audi say centreless wheel balancing only.

[zollaf]

the centre hole mounts tightly over the hub and is how the wheel is mounted. the wheel bolts merely hold it on. this is why spigot rings must be used if the centre bore of the wheel is bigger than original. if you don't believe me, remove a factory fitted wheel and have a look. if the centre hole is off centre, then the wheel is scrap, not refurbed but scrap.