New tyres completely upset handling

[shorts!]

Had some new goodyears put on the rear a few weeks ago, at a reputable dealer, but since then then car feels decidedly nervous, prone to tramlining and pretty imprescise on the faster corners. I thought they'd bed in with a bit of use but that was a couple of thousand miles ago. Perhaps it shows how well set up the car was on its well used Goodyears but I'm a little nervous taking it to Croft next week in its current state. I guess I'll have to have the alignment done again but the guys who did it last time sound like they're too busy before the Croft trackday. Any recommendations, especially in the South?

[tvron]

If you are in Essex Area Supertyres at Maldon are very good and have latest rig

[pupp]

May be obvious but tyre pressures? Not been left over-high by the tyre monkeys have they?

[hollowlegs]

tyre monkeys had mine on at 50psi , took me a day or two till i figured it out

[red griff roger]

Definitely check the pressures. Mine new shoes on the back felt horrible, until I found the pressure was 35psi.

[tvrbob]

shorts! said:

Had some new goodyears put on the rear a few weeks ago...........prone to tramlining

Tramlining is a front wheel issue. I can't imagine how changing rears would cause this.

Best thing to do is to get the pressure right. The 'book' pressure will not necessarily be right for these tyres. Best to try them over a range. 20 - 26psi. Don't go below 20 as this can cause the tyres to rotate on the rim that in turn causes loss of pressure. Once you find the optimum pressure you need to get some heat into them to vaporise any 'mould slip' that tends to remains in the tread for a few hundred miles.

One thing you may be wise to think about, tracking a car with new tyres will cause excessive heat build-up due to too much tread flexing. Be cautious out there and try to recognise the signs. If grip starts to fall away you may need to pull into parcferme early.

[leorest]

This is your man

www.centergravity.co.uk
Chris Franklin
center gravity limited
12 orchard way
measham
derbyshire
de127jz
phone: [phone]

He has a mobile rig so location is not a problem! Can even take it to your track of choice.
Driver "I dont like the way it ........"
Chris "measure, spanner, spanner, tweak"
Driver "Vroom vroom squeal giggle, Ahh thats much better thanks"

[shorts!]

Thanks guys. I don't think it's a pressure problem as I've been playing around with these already. Like TVRbob I too don't know why the new rears would lead to more tramlining, if I did I probably wouldn't be asking for advice . . .
And I agree new tyres and trackdays aren't a great combination, something I try to avoid; like long tee-shirts and short shorts.
Thanks for the hint about the mobile guy, he may be the best option if my usual guys can't squeeze me in.
Still welcome any other help though.

[dickkark]

did they definitely fit them to the rears?it isn`t unheard of for them to take it upon themselves to swap wheels around and possibly fit one of the best remaining tyres from the back to the front,not realising the different offset?
or have they jacked it up on something that could have bent,even slightly would make a difference.

I spotted a honda recently at a tyre bay, the young(very overwieght) lad was trying to do tracking, with it jacked up so he could reach!

[gerjo]

I had the same problems last year with new Toyo's on the rear. New front tyres and geometry check solved it in the end.