Uneven wear on front tyres
Discussion
Car is in for an MOT today. As expected it failed as the front tyres are rather worn. They are replacing the tyres at a very reasonable price, but were about to take the spanners to the front suspension as they reckon the alignment must be out due to the uneven wear across the width of the tyres.
Another MOT place came up with the same diagnosis a couple of years ago, but I was assured by a TVR specialist that the uneven wear is to be expected if the car is set up right.
Has anyone else had a "false" warning like this from non-TVR specialists? Should I be worried?
Another MOT place came up with the same diagnosis a couple of years ago, but I was assured by a TVR specialist that the uneven wear is to be expected if the car is set up right.
Has anyone else had a "false" warning like this from non-TVR specialists? Should I be worried?
Podie said:Yeah, that's how it struck me first time round. I can imagine you might set up the camber and tow (do I know what I'm tlking about? Do I ***) to give optimum grip when the car is cornering hard, i.e. when the car is rolling towards the outside of the bend. That set up might cause the tyres to scrub when you're going in a straight line.
That just doesn't sound quite right to me...
ATG said:
That just doesn't sound quite right to me...
Yeah, that's how it struck me first time round. I can imagine you might set up the camber and tow (do I know what I'm tlking about? Do I ***) to give optimum grip when the car is cornering hard, i.e. when the car is rolling towards the outside of the bend. That set up might cause the tyres to scrub when you're going in a straight line.
Fair point...
Be interested to see if someone like Joolz can set the record straight though...
I had a chat with a tyre guy a couple of years back and he mentioned that for our wide tyres running low-ish pressures, he would expect to see more wear at the shoulders than in the centre.
Noting that my old tyres had worn evenly, he remarked that I must have done some "continental driving" to wear out the middle too.
Noting that my old tyres had worn evenly, he remarked that I must have done some "continental driving" to wear out the middle too.
steve1c said:I could tell you about the time I got confused by the tyre pressure guage and drove around for a, erm, while with what I thought was 24 psi in the tyres but was actually 2.4 of the unit on the other side of the lollipop stick. I could tell you about that, but i won't coz I'd look staggeringly thick. Oh bugger.
I've noticed that 2psi extra gives more of an even wear pattern. Bit more bumpy though. Also slightly easier to steer at low speeds without P/S.
Other than tyre pressures the only other variable in the marketplace I have noted is the toe in numbers.
The quick boys seem to toe in the front 20' to counteract the bump steer syndrome on heavy braking etc.
I wonder if this has transfered as gospel for the daily drivers and could be a factor in tyre wear, I tend to set Chims parallel or 5 minutes toe in.
Cue Jools & PH
>> Edited by bugsy on Saturday 28th May 11:53
The quick boys seem to toe in the front 20' to counteract the bump steer syndrome on heavy braking etc.
I wonder if this has transfered as gospel for the daily drivers and could be a factor in tyre wear, I tend to set Chims parallel or 5 minutes toe in.
Cue Jools & PH
>> Edited by bugsy on Saturday 28th May 11:53
ATG said:And now that I have the car back, i know why. When I said "replace them with exactly the same tyres; SO3s", my girlfriend interpretted "exactly the same" as meaning "round and black". My front wheels now sport the finest, budget V rated rubber all the way from Serbia.
.... They are replacing the tyres at a very reasonable price...
ATG said:
.... They are replacing the tyres at a very reasonable price...
And now that I have the car back, i know why. When I said "replace them with exactly the same tyres; SO3s", my girlfriend interpretted "exactly the same" as meaning "round and black". My front wheels now sport the finest, budget V rated rubber all the way from Serbia.
Oh dear!!! can't even donut to destruction if they are on the front
If the car is set up with negtaive camber for good track and high speed performance, the inner shoulders will wear first. If the car is driven hard, the shoulders will tend to wear first. Page 337 of the bible has a piccy showing a typicl wear pattern in this case.
Toe has little to do with wear at the amounts you are talking about. Toe out can cause some interesting issues as it does make the car unstable under breaking but can help turn in. Definitely a competition setting though.
Steve
www.tvrbooks.co.uk
Toe has little to do with wear at the amounts you are talking about. Toe out can cause some interesting issues as it does make the car unstable under breaking but can help turn in. Definitely a competition setting though.
Steve
www.tvrbooks.co.uk
ATG said:
I've noticed that 2psi extra gives more of an even wear pattern. Bit more bumpy though. Also slightly easier to steer at low speeds without P/S.
I could tell you about the time I got confused by the tyre pressure guage and drove around for a, erm, while with what I thought was 24 psi in the tyres but was actually 2.4 of the unit on the other side of the lollipop stick. I could tell you about that, but i won't coz I'd look staggeringly thick. Oh bugger.
at least you didn't drive around with 34 psi on the new back tyres for a week, wondered why it was bouncing for Britain!! duh!
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