New tyres

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Neil1911
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Location: Sheffield, England

Post by Neil1911 » Fri Aug 05, 2022 10:04 am

pmg wrote:
Thu Aug 04, 2022 11:26 pm
Neil1911 wrote:
Thu Aug 04, 2022 10:54 pm
Sheffield OPC have agreed to replace my two front tyres at "cost price" which is £10 per tyre more than Blackcircles, a premium I'm happy to pay for the coffee and pleasant waiting room!
Have you worn the fronts more than the years? I am the other way round and will need new rears this Autumn with the fronts likely to do another summer
Yes, the tracking has obviously been out, I wish I knew why/how. Most of the width has got plenty of tread but the inner edges are seriously worn, driver's side being the worst.
Gen2 S: another Volcano Grey, 18" Macan Wheels +Spare, 14 way seats, ACC, Air Susp, PASM, Roof rails, Heated Screen & Front Seats, 75l tank, Comfort Lighting, PS+, Rev camera.
PNIX29H8 ordered, 11 Jan 2022 @ Stockport.

On-Track
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Post by On-Track » Fri Aug 05, 2022 10:09 am

Neil1911 wrote:
Fri Aug 05, 2022 10:04 am

Yes, the tracking has obviously been out, I wish I knew why/how. Most of the width has got plenty of tread but the inner edges are seriously worn, driver's side being the worst.
I assume this is a stupid question but I take it you've had the steering realigned? Alignment really needs to be done on all four wheels.
Peter

Current: 2020 Carmine Red GTS http://www.porsche-code.com/PMST9ZI9
Gone- 2015 Sapphire Blue Diesel
Gone -2013 Cayenne Diesel

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SAC1
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Post by SAC1 » Fri Aug 05, 2022 12:05 pm

Neil1911 wrote:
Fri Aug 05, 2022 10:01 am
SAC1 wrote:
Fri Aug 05, 2022 6:56 am
Here is what the BTMA says about replacing a pair of tyres, rather than a full set:

"Due to their greater tread depth, new tyres will generally have better grip than the remaining tyres on the vehicle, especially in the wet. This grip differential can lead to vehicle instability under sudden manoeuvres, such as when swerving and braking to avoid a collision. Electronic stability programs reduce this risk but in general it is best to fit new tyres in pairs and to the rear axle. However, where the vehicle manufacturer gives different advice you should follow it."

https://btmauk.com/advice-about-tyres/m ... c803a-b661
Steve! That was fine on my Focus, but when front and back DON'T use the same tyres it can't be applied.
Neil - yes I do know about the size difference! But will there be more than 3mm difference in tread depth between the new fronts and the existing rear tyres? If so, then I'm sure that your OPC will want you to change all 4 tyres.
Steve

2020 GTS in Sapphire Blue
(sold) 2017 SD in Rhodium Silver

bennachie
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Post by bennachie » Fri Aug 05, 2022 12:14 pm

OPC four wheel alignment works out cheap compared with a new set of tyres. Speed bumps knock hell out of tracking..................to say little about the potholes in our so called 'highways' some of which are little better than their roman counterparts
'The secret of life is enjoying the passage of time'

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Neil1911
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Post by Neil1911 » Fri Aug 05, 2022 1:14 pm

SAC1 wrote:
Fri Aug 05, 2022 12:05 pm
Neil1911 wrote:
Fri Aug 05, 2022 10:01 am
SAC1 wrote:
Fri Aug 05, 2022 6:56 am
Here is what the BTMA says about replacing a pair of tyres, rather than a full set:

"Due to their greater tread depth, new tyres will generally have better grip than the remaining tyres on the vehicle, especially in the wet. This grip differential can lead to vehicle instability under sudden manoeuvres, such as when swerving and braking to avoid a collision. Electronic stability programs reduce this risk but in general it is best to fit new tyres in pairs and to the rear axle. However, where the vehicle manufacturer gives different advice you should follow it."

https://btmauk.com/advice-about-tyres/m ... c803a-b661
Steve! That was fine on my Focus, but when front and back DON'T use the same tyres it can't be applied.
Neil - yes I do know about the size difference! But will there be more than 3mm difference in tread depth between the new fronts and the existing rear tyres? If so, then I'm sure that your OPC will want you to change all 4 tyres.
I was a little surprised they didn't, on checking the rears, on average, have 5mm, they must be happy with that.

I'll certainly be keeping a closer eye on the tracking in future, although I find it strange this didn't seem to be an issue with the first set, they onky lasted 13,500 miles but the wear wasn't as uneven as these.
Gen2 S: another Volcano Grey, 18" Macan Wheels +Spare, 14 way seats, ACC, Air Susp, PASM, Roof rails, Heated Screen & Front Seats, 75l tank, Comfort Lighting, PS+, Rev camera.
PNIX29H8 ordered, 11 Jan 2022 @ Stockport.

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pmg
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Post by pmg » Fri Aug 05, 2022 1:58 pm

Neil1911 wrote:
Fri Aug 05, 2022 1:14 pm
SAC1 wrote:
Fri Aug 05, 2022 12:05 pm
Neil1911 wrote:
Fri Aug 05, 2022 10:01 am


Steve! That was fine on my Focus, but when front and back DON'T use the same tyres it can't be applied.
Neil - yes I do know about the size difference! But will there be more than 3mm difference in tread depth between the new fronts and the existing rear tyres? If so, then I'm sure that your OPC will want you to change all 4 tyres.
I was a little surprised they didn't, on checking the rears, on average, have 5mm, they must be happy with that.

I'll certainly be keeping a closer eye on the tracking in future, although I find it strange this didn't seem to be an issue with the first set, they onky lasted 13,500 miles but the wear wasn't as uneven as these.
New tread is about 7 o 7.5 so 5 is within 3mm
2019 Macan S Porsche code PKW8WKI8

bennachie
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Post by bennachie » Fri Aug 05, 2022 8:55 pm

Allegedly 8 mm new
'The secret of life is enjoying the passage of time'

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Nuclear Nick
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Post by Nuclear Nick » Sat Aug 06, 2022 7:07 am

Neil1911 wrote:
Fri Aug 05, 2022 10:04 am
pmg wrote:
Thu Aug 04, 2022 11:26 pm
Neil1911 wrote:
Thu Aug 04, 2022 10:54 pm
Sheffield OPC have agreed to replace my two front tyres at "cost price" which is £10 per tyre more than Blackcircles, a premium I'm happy to pay for the coffee and pleasant waiting room!
Have you worn the fronts more than the years? I am the other way round and will need new rears this Autumn with the fronts likely to do another summer
Yes, the tracking has obviously been out, I wish I knew why/how. Most of the width has got plenty of tread but the inner edges are seriously worn, driver's side being the worst.
Do you have a lot of speed cushions locally? Driving over these wears the inner shoulders rapidly.
Nick

Defender 90 V8

991.2 C2 GTS

Macan Turbo - sold

BMW K1300S, BMW R1250 GSA

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Neil1911
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Location: Sheffield, England

Post by Neil1911 » Sat Aug 06, 2022 7:35 am

Nuclear Nick wrote:
Sat Aug 06, 2022 7:07 am
Neil1911 wrote:
Fri Aug 05, 2022 10:04 am
pmg wrote:
Thu Aug 04, 2022 11:26 pm


Have you worn the fronts more than the years? I am the other way round and will need new rears this Autumn with the fronts likely to do another summer
Yes, the tracking has obviously been out, I wish I knew why/how. Most of the width has got plenty of tread but the inner edges are seriously worn, driver's side being the worst.
Do you have a lot of speed cushions locally? Driving over these wears the inner shoulders rapidly.
A good number, but I wouldn't have thought I engaged with them often enough, once or twice a week maybe, and no more with this set of tyres than the previous ones. Regardless, I'll be switch to comfort mode and taking them square on rather than trying to straddle them from now on.
Gen2 S: another Volcano Grey, 18" Macan Wheels +Spare, 14 way seats, ACC, Air Susp, PASM, Roof rails, Heated Screen & Front Seats, 75l tank, Comfort Lighting, PS+, Rev camera.
PNIX29H8 ordered, 11 Jan 2022 @ Stockport.

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Nuclear Nick
Posts: 3217
Joined: Wed Feb 17, 2016 3:42 pm
Location: Bristol

Post by Nuclear Nick » Sat Aug 06, 2022 8:44 am

Neil1911 wrote:
Sat Aug 06, 2022 7:35 am
Nuclear Nick wrote:
Sat Aug 06, 2022 7:07 am
Neil1911 wrote:
Fri Aug 05, 2022 10:04 am

Yes, the tracking has obviously been out, I wish I knew why/how. Most of the width has got plenty of tread but the inner edges are seriously worn, driver's side being the worst.
Do you have a lot of speed cushions locally? Driving over these wears the inner shoulders rapidly.
A good number, but I wouldn't have thought I engaged with them often enough, once or twice a week maybe, and no more with this set of tyres than the previous ones. Regardless, I'll be switch to comfort mode and taking them square on rather than trying to straddle them from now on.
Yes, good plan. Getting the offside or nearside pair of wheels over the centre of the pad evens out the wear across the face of the tyre.
Nick

Defender 90 V8

991.2 C2 GTS

Macan Turbo - sold

BMW K1300S, BMW R1250 GSA

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