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RogerH

Tyre Wear

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Hi Folks,

the outer edge of my rear nearside tyre is wearing quicker than normal. What would be the usual cause ??

Excess toe in is my first guess but has anybody got more expert knowledge.

All four tyres were replaced last October with Vred Sprint Classic. The fronts still look very good. The rear off side is worn a little more but quite evenly across the wodth.

 

Roger

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Have you got a local tyre depot with operators and kit you can trust to do 4-wheel alignment, including checking camber? Or maybe a motorsport specialist with 4-wheel laser alignment?

If you can find an intelligent, sympathetic operator, get your camber and toe checked then (if necessary) adjusted to factory standard settings, that should help.

I'm lucky to have a tyre centre locally who are interested and will do this properly. It probably helps that the boss has restored a Herald, which he took to Stratford last month!

Nigel

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Hi Nigel

there is a tyre shop that has a Hawk Eye system. 

 I will fit a shim to correct the possible toe in and then see about getting it scanned.

 

Roger

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I assume it is an IRS car.

If the previous set of tyres didn't wear in this way, something is knackered. it might be the trailing arm bushes, I once made the mistake of fitting a set of poly bushes to my PI Estate which I found a few years later had non stainless crush tubes that had corroded and torn the bushes to shreds internally.

Check the trailing arm mounting brackets, I found several of mine had serious stress cracks, I noted the replacements were thicker metal.

When you are getting the rear tracking checked, sit in the car while it is done if you normally drive solo as the tracking changes with suspension loading. When I built my TR6 about 30 years ago I tracked the car empty but suffered wear on the rear tyres, so I ballasted it to my weight with bags of sand before resetting it, and I did the same on my TR250. This cured the tyre wear problems.

Neil

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2 minutes ago, RogerH said:

Hi Nigel

there is a tyre shop that has a Hawk Eye system. 

 I will fit a shim to correct the possible toe in and then see about getting it scanned.

 

Roger

FWIW,

I had my car set up on a Hunter Hawk Eye system, I provided the Brown Bible TR6 Workshop Manual for the operator/technician to refer to.....he never even opened the book! Instead he told me they contact the U.S. manufacturer of the Hawkeye system giving them the vehicle details, Hunter Hawkeye respond by email with the settings and the technician adjusts accordingly, my car drives brilliantly after this treatment and I highly recommend it.

Richard.

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Hi Neil,

I had a sneaking suspicion that something was not right on the previous set of tyres.

I adjusted the back end in about 2015 and noticed last year that the NSR tyre was wearing quicker than the OSR tyre. 

I fitted the new set of tyres last October and noticed the wear today with all the tyres off the car.

I was happy with the camber but wondered if toe-in was the problem.

More Hawk eye testing to do.

 

Roger 

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Hi Roger, could be worth checking toe in yourself first, I made a simple gauge to do this out of a length of 1ins x 1/4 ins steel bar with a slotted join in the middle and a notch each end. Standing this on two blocks and adjusting to the smaller size at the front of the wheel rims allows you to move the bar to the rear of the wheels where the gap indicates the toe in. I used this on my fronts before and after fitting a new steering rack and it was accurate enough for tyre shop to say it needed no further adjustment. 

You could also check if tyre is holding pressure, under inflation or excessive weight on one side (did I say that) could cause this, also check damper and spring. 

Lastly is  the spring bridge level, they can crack at ends and bend upwards lowering car on that side. 

Chris

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Hi Chris,

the rear is fairly level (by eye). The bridge is still in one piece. I tend to run a little over pressure (apprx 28psi)

 

I have fitted a extra shin in the outer arm of the TA - this should reduce whatever toe-in is there.

Next week I'll pop into my local Hawkeye tyre shop.

 

Roger

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59 minutes ago, ChrisR-4A said:

Hi Roger, could be worth checking toe in yourself first, I made a simple gauge to do this out of a length of 1ins x 1/4 ins steel bar with a slotted join in the middle and a notch each end. Standing this on two blocks and adjusting to the smaller size at the front of the wheel rims allows you to move the bar to the rear of the wheels where the gap indicates the toe in. I used this on my fronts before and after fitting a new steering rack and it was accurate enough for tyre shop to say it needed no further adjustment. 

You could also check if tyre is holding pressure, under inflation or excessive weight on one side (did I say that) could cause this, also check damper and spring. 

Lastly is  the spring bridge level, they can crack at ends and bend upwards lowering car on that side. 

Chris

:0o :0)

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