Vibration when changed to standard tyres

[ls19]

Hi All,

Long time browser but only second time posting (1st was related to the soft close wiring issue in the boot with this forum help me resolve). Once again I find I need some help.

I have changed my tyres on my 35i from run flats to Goodyear Eagle F1's (with alignment and wheel balancing) around 3/4 months ago. I have noticed since this change i get some vibration through the steering wheel and brakes on certain roads. When driving this can be just through the steering wheel and under braking it will come through the pedal as well. Now for the tricky bit i can not get it to repeat if i try unless i am on the roads i know where it does it. I've put it on a break tester to see if the discs are warped but again there was very minimal difference on either side so doesn't seems to be the issue. Also under heavy braking on some roads no feedback is given. It seems odd but it happens on too many roads for me to think it can just be a results of these certain roads which to the eye don't seem much different.

Has anyone got any experience or ideas on what this could be? Failing this i have it booked in for rear brakes on the 21st Nov so they can have quick look over the front brake and suspension set up then. Main thing i can think to try now is switch a friend identical wheels with runflats on to mine again and see if the vibration is still there.

Thanks in advance.

[djstan]

What tyres have you gone for? It’s a long shot, but are they directional (and are they on the correct way?)

Edit: scratch that, just re-read the original post - can’t remember what the F1s are though..

[ls19]

Thanks, had a look when I got home and they are fitted fine. The tyre pressures have been ok the last couple of months as well.

[john-e89]

Had a good think about this and all I can come up with is changing from the rock solid runflats, which perhaps have wear on them, and next to no feel, to premium non run flats, have highlighted issues in the roads you mention that previously were hidden by the run flats. If you’re not getting your issues on roads you’re not using all the time then that perhaps tells the story, ie, don’t worry, it’s just the roads you know have issues and not your car. There is a section of road near me that rattles my teeth fillings, but it’s that particular stretch of....tarmac...I say that in its most loosed term, not the car.

[ls19]

Hopefully your right. I have been trying to figure this out for a while and still not got anywhere. Will keep thinking for now until it is in for the rear breaks in a couple of weeks and see if they can spot anything whilst it is on the ramps. Only thing I think is if the fronts are slightly warped it may be amplified on certain roads or as you say the normal tyres feel different. Thanks for thinking it over

[john-e89]

Hopefully your right. I have been trying to figure this out for a while and still not got anywhere. Will keep thinking for now until it is in for the rear breaks in a couple of weeks and see if they can spot anything whilst it is on the ramps. Only thing I think is if the fronts are slightly warped it may be amplified on certain roads or as you say the normal tyres feel different. Thanks for thinking it over

No problem.

Only thing I’ll add is if the front brakes are warped then they’re warped, you'll feel it whatever the road surface. Plus you get the vibration when not braking so it’s not the discs. Would be worth having the car on some ramps and a good lever around on the suspension arm bushes for any play, plus the track rod ends, but as it’s only on certain roads I think it’s the transition to good rubber you’re not used to.