Tyre wear - questions..
#1
Scooby Regular
Thread Starter
Join Date: Apr 2013
Location: UK
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
Tyre wear - questions..
I'm new to subaru and also AWD. I've taken some tyre tread measurements from the two central groves.. (30psi all round.. looks a little low, I'm going to pump up to 33psi.). Tyres are also all the same brand and make and were on the car when I bought it.
NS Front - 5.2 mm
OS Front - 6.2 mm
NS Rear - 6.1 mm
OS Rear - 6.5 mm
Even accounting for measurement inaccuracy its obvious that the NS Front is wearing faster than the opposite side, especially towards the outside edge.
So my first port of call will be to have the alignment done? as it looks like its out. I don't feel any pulling or anything though.
Next question is I know that the subaru AWD system / diff doesn't like differences in tyre sizes / tread etc.. but how much? The manual just says to not to mix tread depths, sizes etc.. I assume meaning if you have 2/3mm left all round and you get a flat not to just replace the one with a new 8mm tread one?
Also should I rotate the tyres given the current levels or leave for a while, not sure when the last owner did this..
cheers!
NS Front - 5.2 mm
OS Front - 6.2 mm
NS Rear - 6.1 mm
OS Rear - 6.5 mm
Even accounting for measurement inaccuracy its obvious that the NS Front is wearing faster than the opposite side, especially towards the outside edge.
So my first port of call will be to have the alignment done? as it looks like its out. I don't feel any pulling or anything though.
Next question is I know that the subaru AWD system / diff doesn't like differences in tyre sizes / tread etc.. but how much? The manual just says to not to mix tread depths, sizes etc.. I assume meaning if you have 2/3mm left all round and you get a flat not to just replace the one with a new 8mm tread one?
Also should I rotate the tyres given the current levels or leave for a while, not sure when the last owner did this..
cheers!
#2
Scooby Regular
Thread Starter
Join Date: Apr 2013
Location: UK
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
I've seen posts of some of the US forums staring 1/4" circumference max difference and 2/32" tread difference (which is about 2mm), but I can't find anything official from subaru or in my manual... apart from the generic message about using the same size, tread depth etc.. does this imply no difference at all in tread is allowed?
#3
Scooby Regular
Thread Starter
Join Date: Apr 2013
Location: UK
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
The tracking was well out it seems..
Also got them to switch the rear's with the fronts while they were at it, my logic being that the font's will wear a bit quicker so hopefully even it out a bit.
Also got them to switch the rear's with the fronts while they were at it, my logic being that the font's will wear a bit quicker so hopefully even it out a bit.
#5
Scooby Regular
Join Date: Mar 2008
Location: Aberdare / Daventry
Posts: 5,365
Likes: 0
Received 0 Likes
on
0 Posts
Seems like you found the cause you uneven wear. I'd keep an eye on it in the future and check then.
I would not be worried about 1mm on the tread depth, that difference could be seen in the tyre pressures.
I would not be worried about 1mm on the tread depth, that difference could be seen in the tyre pressures.
Thread
Thread Starter
Forum
Replies
Last Post
Mattybr5@MB Developments
Full Cars Breaking For Spares
28
28 December 2015 11:07 PM
shorty87
Wheels And Tyres For Sale
0
29 September 2015 02:18 PM