Uneven front Tyre wear.

farleton · Sep 18, 2019

I have a 987 Gen2. When my car was at OPC for a major service and MOT recently reported that there was excessive wear on the extreme inside edge of the off side front Tyre. Not enough to cause an MOT failure but they suggested that I get the tracking tested. This has been done and the tracking was spot on. When I examined the tyre the wear was very pronounced and not smooth. Having just read Cobnut's post about the RAC I took the decision to change both front tyres with a the same make and model of the tyres on the rear. I wonder whether anyone else has experienced the problem of excessive wear on only one front tyre and whether anyone has an idea of what may be causing this. I do wonder if this could be a speed hump problem. In our vicinity we do have a number of speed humps of the type that can be straddled by cars with sufficient ground clearance. They are too high for the Boxster so I tend to position the left hand wheels on the kerb side of the hump and mount the hump with the offside wheels. All this is done at a very slow speed. There is no corresponding damage to the off side rear tyre maybe because they are wider.

blue99 · Sep 18, 2019

Hi a tire that wears leaving what they call castellated edge as in it’s wearing and feels like the top of a castle is a fault on the wheel bearing

farleton · Sep 18, 2019

Thanks for that but the bearing have been checked and cleared by the OPC when the wear was discovered

s999sws · Sep 19, 2019

That’s exactly what it is. I had a Golf and had to go over a number of speed bumps every day for about a year when going to work. I always straddled them. Anyway, one day I just happened to look under the car, and all of the 4 tyres were worn n the inside edge. I had to replace the lot. Since then I always slow down and drive one wheel over the hump

sws

cobnut · Sep 19, 2019

Hi farleton, just for info, when I had the tracking checked on Tuesday, the guy did confirm it was "miles out", so in my case it seems the problem was tracking. That said, there'd have to be a reason for the tracking to be so out of whack, but given the number of potholes in the roads, it could be any or all of them over a period of time.

I've read a few interesting articles about speed bumps and their effect on car suspensions, and there seems to be conflicting opinions over the risk. There are split humps in and out of our town and until now I've been trying to hit them dead centre with the wheels going either side. I'm going to change that policy now to go over them with one wheel crossing the hump over the middle, the other in the gap. This article claims that the stress involved straddling a hump is far less than in cornering, but cornering is a steady pressure, not a sudden (and on longer stretches, repetitive) impact, so I'm not sure.

Whatever I do, I'll be fastidiously checking the wear across the whole tyre from now on...

J

Dicky_Art · Sep 23, 2019

Sounds like the camber on the OSF is greater than the other Front. Does tracking check camber?
Worn bushes on the control arm?
Do you get any wheel wobble?