I recently upgraded from 16" steels to 17" alloys, i could run up to a 100mph ( german autobahn ) with no wobble at all, but the alloys slightly wobble between 65-70 and i've had them balanced twice at two different places.
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Could be the tyres. Could be suspension components. Could be steering components (I'm starting to get on thin ice here). Anyway, it's not necessarily the wheels.
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Are the alloys new or used ?
Alloys are more likely to be bent and thus be harder/impossible to balance.
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Yes certain types and patterns can get bent. Move them aorund the car to see what happens.
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Are they manufacturers' alloys or are they ones that need adaptors or rings to be fitted?.If they need these parts then be very careful that as you fit them that everything is tightened evenly otherwise they will not run true.
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The alloys are used, but only done 3000 miles no marks or scratches, immaculate condition and tyres as new except one which is slightly scrubbed on outside edge as if its been toeing in.
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Have you put your old steels back on to see if the problem dissappears?
If the alloys are balanced twice by the sounds of it, I don't see why putting them back on the car should then cause them to become unbalanced. The only difference will be the tyre temperature on your car.
I have no idea.
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Yes they are manufacturers alloys.
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Are the tyres fitted to the alloys top line, budget or cheapos? The tyre "price position" makes a lot of difference to balancing with far more weights being needed on cheaper tyres.
I stick to top line, Goodyear NCT5 in my case, and find it's not uncommon that they don't need ANY weights to acheive good balance.
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Yep, i've got nct5's on mine as well.
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I had the same problem could not cure it untill a German tyre fitter said its your rear wheels that are causing the problem and it sure was
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Andy, the rears were causing the fronts to judder?
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I dont think alloys are any harder to balance, and don't agree that they are prone to bending either. If you observe each wheel being spun-up for balancing you should be able to see if the wheel is buckled at least badly enough to cause any wobble.
I had a problem balancing up some alloy wheels, and to be honest it turned out to be the sloppy way the tyre services used their machine. ie After two unsuccesful trips back to the place in question, I went to another tyre services who correctly balanced my wheels at extra cost to myself.
My advice is ask the tyre services how often they calibrate their machine, and also never use mobile tyre fitting services, as every time I have, the balance was wrong.
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Have you tried getting the wheel alignment checked? A knock against a kerb around the time you swapped the wheels over could be the problem, with the new alloys providing a red herring.
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