New tyres before geo?
Discussion
Current tyres have done 10k miles and are 7 year old MPS (car is 996 Turbo S). Would you replace these before a geo set up?
They clearly have life in them, but advice seems to say "they are old so replace them" and "they are not worn evenly so will affect a geo set up".
| Tyre | Inner | Middle | Outer |
| Front Nearside | 5.2 | 5.9 | 4.8 |
| Front Offside | 4.5 | 5.7 | 5.5 |
| Rear Nearside | 3.8 | 4.6 | 4.2 |
| Rear Offside | 4.3 | 4.8 | 3.8 |
They clearly have life in them, but advice seems to say "they are old so replace them" and "they are not worn evenly so will affect a geo set up".
chris7676 said:
Why would that be the case, except for what I mentioned ?
The tyre sits differently on the rim as it is a new straight tyre not worn to the original camber like the old tyre has. You do a geometry, then fit some new tyres and you will see the steering wheel will be off centre.Seen this 100 times before, people that do wheel alignments on old tyres then fit new ones..... you are wasting everyones time.
Mike
sportsandclassic said:
chris7676 said:
Why would that be the case, except for what I mentioned ?
The tyre sits differently on the rim as it is a new straight tyre not worn to the original camber like the old tyre has. You do a geometry, then fit some new tyres and you will see the steering wheel will be off centre.Seen this 100 times before, people that do wheel alignments on old tyres then fit new ones..... you are wasting everyones time.
Mike
plus 7 year old tyres? not on my car thank you very much
For the OP thought I would do a before and after. Old to new tyres. Your tyres dont have dissimilar wear to my Cayman so thought it would be an idea to let you know that if you tyres dont have large wear differences from inside to outside it's worth having an alignment done if you dont plan to chuck your tyres away soon.
This has the tread depths written on the sheet for comparison.
Now after a new set of tyres fitted you can see that almost no difference is measured on the before and after.
Dont get me wrong if you have tyres with bad wear patterns on them ie large differences inside to outside it would not be wise to align the car with the old tyres on. Your figures are not too bad so had the tyres not been old I would have checked the alignment on those tyres.
Hope this helps.
This has the tread depths written on the sheet for comparison.
Now after a new set of tyres fitted you can see that almost no difference is measured on the before and after.
Dont get me wrong if you have tyres with bad wear patterns on them ie large differences inside to outside it would not be wise to align the car with the old tyres on. Your figures are not too bad so had the tyres not been old I would have checked the alignment on those tyres.
Hope this helps.
Hi Matt,
Thanks for posting this information; good to have some real data. Since starting the post I have had 4 new MPS2's fitted courtesy of Costco and I'm just waiting to get the geo set up. Given that I don't think the car has been geo'd before in 7 years I'm looking forward to seeing the difference
!
Thanks, Paul.
Thanks for posting this information; good to have some real data. Since starting the post I have had 4 new MPS2's fitted courtesy of Costco and I'm just waiting to get the geo set up. Given that I don't think the car has been geo'd before in 7 years I'm looking forward to seeing the difference
!Thanks, Paul.
New tyres on their own should feel better if nothing else. Getting the geo done should also improve the handling if yours isn't great to start with. Gassing Station | Porsche General | Top of Page | What's New | My Stuff