Another tyre question - slight imbalance

[gdr]

Got a new set of A039s on, and they are giving slight vibration from 70ish up. Tyre fitter (Westhill Service Stn) is very good, he had a second attempt at balancing today. The machine says they are spot on but I'm still getting slight vibration. Anyone with similar experience of this? Could it be tread pattern or a slightly less than circular tyre? It doesn't seem to be consistent on all surfaces, on rougher tarmac vibration goes away. Car has not been sitting stationary long so I don't think a flat spot could have developed. I'm sure I've heard that trackday tyres can be a problem to balance sometimes but previous sets (48s and R888s) I've had on have been fine.

[Jamie84]

I sometimes feel asthough my wheel has a slight vibration, was gonna make a post about it the other day . Sometimes Its there sometimes not , makes me wonder if its just the fact you can feel every single little bump on the road , due to the accuracy/feel of the car .

Can anyone shed anymore light on this ?

[Brian J]

Does seem to be that with some sets of tyres it's difficult to avoid that sort of vibration. Had 48s without it but current R888s do despite two attempts to balance.

[mattg]

I had something like this a while back. steering wheel vibrated above 60mph.

turned out to be an off axis buckle in a front wheel.
found out by jacking car up, releasing brake (careful!) and spinning wheel with hand, noticed the wheel rim moved in and out with each rotation.
had to buy a new wheel in the end as this cannot be fixed.
m

[gdr]

The wheel buckle would be a concern, but pretty sure it is not the issue for me - you need to hit something (like a large rock) hard to do that (as I found out with my trusty 535i). My problem is defo tyre related, fine with the last set of 888s, a tad off with the new A039s, not so much as a minor pothole incident in between.

[Shug]

The wheel buckle would be a concern, but pretty sure it is not the issue for me - you need to hit something (like a large rock) hard to do that (as I found out with my trusty 535i). My problem is defo tyre related, fine with the last set of 888s, a tad off with the new A039s, not so much as a minor pothole incident in between.

Try getting them re-balanced somewhere else - I've seen 48s taking 2 or 3 goes before. Dunny why they should be, but it seems they can be tricky.

[gdr]

May have another balancing attempt tomorrow since Wheelsaround will be at the TrackScotland event at KH. I also have a sneaking suspicion that one of the A039s may be fashioned along the lines of a 20p piece. Maybe should run a bit more pressure (i.e. book 29 psi) on trip down to KH to see if it becomes perfectly round again.