check your tyres

[lucky63]

hi ! newbie here on PH, my first post of many - so here goes - after reading the thread on 'do you wait till 1.6mm before changing your tyres' i decided to check my treads on my 2010 997.2 turbo cab, they are bridgestone potenzas with 9300 miles on them, viewing from the back of the car they looked ok but after checking with tyre guage i have 3mm on outer edge 4mm middle 1.5mm inner edge and fabric cord showing on the last 5mm of the inner edge on both back tyres !! - the only way i saw this damage was with a torch, guess i could have had a major blow out at any time ! have ordered a new set of michelin SS from Event Tyres (cheapest fitted price i could find)

[6C4GTS]

You need your geo set up when your new tyres go on too.

[Sandy59]

It's really not that easy checking you tyres properly on a 911, especially the rears for any damage or small nails etc.
I wonder how many people on here right now, could categorically state they have no real damage or small nails etc in their tyres ??

[BertBert]

Sandy59 said:

It's really not that easy checking you tyres properly on a 911, especially the rears for any damage or small nails etc.
I wonder how many people on here right now, could categorically state they have no real damage or small nails etc in their tyres ??

I can! They are sitting in a pile in my garage waiting to go on the wheels tomorrow. I love new tyres
Bert

[stevod]

6C4GTS said:

You need your geo set up when your new tyres go on too.

And is the low wear in the middle a sign of pressures being too low?

[FarQue]

BertBert said:

Sandy59 said:

It's really not that easy checking you tyres properly on a 911, especially the rears for any damage or small nails etc.
I wonder how many people on here right now, could categorically state they have no real damage or small nails etc in their tyres ??

I can! They are sitting in a pile in my garage waiting to go on the wheels tomorrow. I love new tyres
Bert

i'm with you on this Bert - I too love a stack of new tyres in the garage!

[NBTBRV8]

That's how mine wore too, the left hand one goes before the right hand one too. I had my set up checked by 2 different independents and both said I was spot on. When I was at a Porsche driver training day I looked under the back of a 997.2 turbo and it was wearing like this too. I think this is the way they wear normally.

[red997]

the cars run a relatively large amount of neg rear camber - to aid rear grip.
in 'normal' driving you will always wear the inner edges first.

Having a fast road / track geo will make the situation worse (usually adds even more neg camber), especially if you drive like a girl !

[Sandy59]

FarQue said:

BertBert said:

Sandy59 said:

It's really not that easy checking you tyres properly on a 911, especially the rears for any damage or small nails etc.
I wonder how many people on here right now, could categorically state they have no real damage or small nails etc in their tyres ??

I can! They are sitting in a pile in my garage waiting to go on the wheels tomorrow. I love new tyres
Bert

i'm with you on this Bert - I too love a stack of new tyres in the garage!

Ok apart from Bert, FarQue, and myself - car's at the OPC, right now how many people could categorically state they have no real damage or small nails etc in their tyres ??

[stubbsy996]

stevod said:

6C4GTS said:

You need your geo set up when your new tyres go on too.

And is the low wear in the middle a sign of pressures being too low?

No! that's pressure too high.
Wear on edges would be pressure too low.

[Trev450]

Sandy59 said:

Ok apart from Bert, FarQue, and myself - car's at the OPC, right now how many people could categorically state they have no real damage or small nails etc in their tyres ??

Me, because I only fitted my summer wheels and tyres back on a couple of days ago and they had a good inspection before doing so.

[monthefish]

lucky63 said:

on outer edge 4mm middle 1.5mm inner edge and fabric cord showing on the last 5mm of the inner edge on both back tyres !!

This wear pattern is extremely common.

[lucky63]

i always keep the rear tyre pressure at 2.7 bar (cold) and have a pressure monitor system - it is just shocking to only notice the inside tyre wear with a torch and head under the rear bumper !

[BertBert]

stubbsy996 said:

stevod said:

And is the low wear in the middle a sign of pressures being too low?

No! that's pressure too high.
Wear on edges would be pressure too low.

I think the question has confused you there stubbsy! The OP talked about having most tread in the middle, ie least wear. stevod's question was about this. "low wear" = "least wear". Which could indeed be a sign of pressure too low (or a case of TADTS)

Pressure too high could cause high wear = most wear!
Bert

[Jim1556]

BertBert said:

I think the question has confused you there stubbsy! The OP talked about having most tread in the middle, ie least wear. stevod's question was about this. "low wear" = "least wear". Which could indeed be a sign of pressure too low (or a case of TADTS)

Pressure too high could cause high wear = most wear!
Bert

Beat me to it, but just for illustration:

[r1flyguy1]

Trev450 said:

Sandy59 said:

Ok apart from Bert, FarQue, and myself - car's at the OPC, right now how many people could categorically state they have no real damage or small nails etc in their tyres ??

Me, because I only fitted my summer wheels and tyres back on a couple of days ago and they had a good inspection before doing so.

Me too

I took all my wheels off last week to clean them and inspect the tyres.... Did find slight corrosion on one of the alloys, and a slight graze on another on the inside rim, god damn it

[ClarkPB]

I check my tyres (including pressures) every time I clean it...which is pretty much after every time I've had it out!

[2stis]

Sandy59 said:

Ok apart from Bert, FarQue, and myself - car's at the OPC, right now how many people could categorically state they have no real damage or small nails etc in their tyres ??

I can. I take the wheels off the car regularly to clean the inner faces and also check the tread all the way around then.