Car - juddering feeling like an unbalanced tyre - FIXED!

[DrDonnyBrago]

Hi, my car has developed a 'juddering' feeling over 60mph. is fine whilst braking etc but over 60mph you can feel a bumping through the car. Happens about 2 or 3 times a second at 60mph.

Other than unbalanced tyres, what else could be causing it?

[MaybeGuy]

drive shaft/wheel bearing?
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[Kickstart]

Hi

Tyre would be my main guess but a buckled wheel would also cause it. And a worn shock will probably make this vibration far worse from just a lightly out of balance wheel.

Would agree with Matt about a drive shaft or wheel bearing being possible, but I would suspect you would hear other symptoms first before the vibration became an issue.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[DrDonnyBrago]

Thanks; I have hit a few rather deep pot holes over the winter months so anything is a possibility.

I am hoping I have just lost a wheel weight but will have a proper look at the weekend so need to know what else to look out for.


What sort of symptoms would a duff drive shaft or wheel bearing make? How would I check, spin the wheel and feel/hear for grinding?

[Kickstart]

Hi

Wheel bearings normally rumble when really bad, but whine when starting to go. You will probably be able to feel play in them.

If you have hot pot holes then a fair chance a wheel is buckled. Check the inside edge (we wrecked a wheel on the 155 on a lump of something on a roundabout, looked OK from the outside by a deep buckle on the inside edge)

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[DrDonnyBrago]

[tahrey]

Also don't forget the possibility of either something wrong with the tyre (flatspotted somehow?), or a driveshaft balancer having shifted or fell off.

I had the latter once and got through about four garages and an endless parade of wheel rebalancing/swapping around/etc before one of them actually figured it out!

[DrDonnyBrago]

Thought I would update for the benefit of future search results:

The problem was a slightly buckled wheel and a tyre that was very damaged. Tyre looked 99% normal with pressure in it, when it was taken off the rim though it it was very badly shaped (dent and twist in the tread), also splits in the rubber with threads exposed could be seen between the tread. I'm lucky it didn't blow I reckon, feckin potholes!

Anyway thanks for the help .