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Discussion Starter #1
This is my first post i always google any problem/diy I want to do on my car and always end up here finding the answer so I thought today I'd become a member as it just makes sense.

I've got a 2003 e46 330ci m sport convertible and I got a set of new csl reps took them to my local tyre guy got the mv2 alloys off swapped over the tyres happy days. But now when doing 70mph and breaking down to 50mph I get a really bad wobble but it's not really present during normal around town driving.
What could this be I read it won't be wheel balancing because I'd get the wobble all the time just very strange as I've not had it before on the other alloys quite the opposite my car used to drive perfectly on any run ? Any help would be appreciated
 

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If you have vibration the first thing you want to rule out is balancing. I would have them rebalanced. Generally if your wheels are unbalanced, when you go fast you will feel it, and when you so slow you won't.

Since it happened right after you got new wheels, it's mostly likely related to your new wheels. Sometimes cheap aftermarket wheels have defects and cause vibration problems at high speeds. Hopefully it's just a balancing issue.
 

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Discussion Starter #3
Thanks for the quick reply.

The wheels are 8j front and 9j rear so can't swap them over. And the guy who fitted them said they are really good light weight alloys he knows the guy who imports them to the uk and he has fitted lots. I read online about a guy who changed where is locking wheel nuts were as they were right next to the valve and he moved them opposite and it was ok. But he did have them re balanced too so don't know if that would make a difference. Is it possible that a weight has come off a wheel and is making the car wobble or would it wobble all the time if it was not balanced properly ?

On my day off Il go down there and get them to rebalance all wheels again if you think it could be a balancing problem. Thanks again
 

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So this is the same old situation, you cannot balance something out of round and make it turn round.

So bent wheels/rims are the very first thing to rule out. You can balance a bent wheel/rim all day long and the balance will show the wheel/tire combination balanced.

The other thing to check is the wheel center bore diameter, some wheels require hub centric spacers.
 

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Discussion Starter #5
So last night I looked at all the locking wheel nuts and they were all right next to the valve. so I took them all out and put them directly opposite the valve then had an hours driving at 70-80mph it was late and not many people on the road so when I had a clear bit of road I was testing the brakes. And the wobble is loads better sometimes didn't even wobble at all on really smooth bits of road but it is still a bit there. So I'm going to go and get them rebalanced. I think there is more of a chance that a balancing weight fell off than the wheels are buckled. I will update this after having them rebalanced as might help someone in the future. Thanks
 

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Discussion Starter #7
Well. The main really harsh. Wobbling is under breaking from 70mph to50mph but the steering wheel is twitching a bit when doing 50-80mph but no where near as bad as it does when breaking. But round town at 30mph doesn't really feel any different to before. But last week when I had the mv2 alloys on it was fine you didn't really need to hold the steering wheel doing 70mph as it was so solid. Then this week new alloys and now I've got this problem just seems like it must be something to to with the wheels ? And I swapped over the locking nuts last night and it was a big improvement as I read someone else did that and it helped. But if it was worn fcabs or sticky callipers I wouldn't of thought moving the locking nuts. Would of made any difference ? Or would it ?
 

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So this is the same old situation, you cannot balance something out of round and make it turn round.

So bent wheels/rims are the very first thing to rule out. You can balance a bent wheel/rim all day long and the balance will show the wheel/tire combination balanced.

The other thing to check is the wheel center bore diameter, some wheels require hub centric spacers.
I agree. I would have the wheels inspected for defects.
 

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Discussion Starter #9
Yesterday I went and got them rebalanced and both the front alloys were out of balance one looked like a weight had come off as there was just a sticky patch left and the guy said that could well cause the problem. and then I had to go back to work. after work pick the misses up so not really had a chance to properly drive the car yet to test but did have a couple of goes going from 60 and breaking hard and I did not notice it but today will be the real test as got a 2 hour round trip of driving so il know later. But so far so good.
 

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Oh and we checked the center bore incase I needed spigot rings but it fits perfect. These alloys are made for the e46 and all specs are spot on. 8j & 9j et 38 & 42.

But will update tomorrow after the run

Thanks for the input
 

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I had a similar problem on my MG ZR years ago, alloys went off got refurbished. Had the same tyres back on and re balanced and had wobbled, looked at what I thought was everything. Turned out to be my Outer CV joint, it had worn but the weight of the car had kept everything tight and together still, once the car had been lifted to remove alloys there was no pressure on the cv joint any more and it obviously moved/slipped then when the car went back on the ground it was no longer right and wobbled like hell. Just needed a new CV, wasn't very expensive and something you can do yourself if you have a basic knowledge and confidence to tackle.
 

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Discussion Starter #13
Well great news for me!! The car drives fine now the mad wobbling when hard breaking from 70-50 is now no longer there it stays perfectly straight and just brakes how it used to. So it was well worth getting the wheels rebalanced. it's mad how much of a difference there is from just being out a little on balance. Still very happy for all the input I got from you guys, this was my first post even though I have read tons of posts on here when doing different things to my car. Thanks again
 

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I'm amazed, and surprised. I've never heard of a wobble that only occurred during braking due to unbalanced tire/wheel. Live and learn
 

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Discussion Starter #15
I did say it was twitching a bit under normal motorway speeds. but didn't really notice anything around town driving at 30 but it was a massive difference when breaking from 70mph to 50mph and that's where it had a really bad wobble. But I'm very happy now as the car drives perfect again. ***55357;***56836;
 
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