New Toyo Proxes on rear has ruined handling

[Else]

Hello all.

I'm looking for advice after fitting a pair of new Toyo Proxes sport tyres to the rear of my TVR Chimaera. It has ruined the handling, feeling as though it is steering from the rear, very unstable in corners and difficult to keep it in a straight line without constant correction. I have no confidence driving it quickly.
It had Toyo Proxes T1R on previously and was fine so I have just fitted a second set or rear wheels with worn Bridgestones on and it is perfect. Very stable and planted and tracks perfectly in a straight-line.

At the time I couldn't get any Proxes T1Rs, I think they have been discontinued so I went for Proxes Sport thinking they are an equivalent but I'm guessing I have made a mistake.

Can any tyre experts help me locate the best equivalent to the original T1Rs

Thanks in advance

Andy

[Else]

So Toyos aren’t proper tyres then?

[Else]

Wow, thanks mate, very informative. I noticed there are several PS4 versions, will have to make sure I understand the differences. I have around 400bhp rear wheel drive and weighs about 1100kg so want to make sure I choose the right tyre this time.

Thanks again

Andy

[Else]

MB140 said:

How long did you have them on for. Could this just be a case of scrubbing off the oils that sit in the surface when they come out the mould. I’d give them 50-100 miles to see if they get better.

Yeah, i thought that too but no improvement even after 200 scary miles

[Else]

Tyre Tread said:

May be an obvious suggestion but have you checked the pressures. Most tyre bays will put circa 30PSI in them and you want about 24 in the rears of a Chim.

It makes a hell of a difference

I ran the same 24 all round with the original TR1s which were great but tried these tyres higher and lower, no improvement. I can only assume the sidewall is much softer allowing the tyre to squirm around.

[Else]

GreenV8S said:

Especially so while the tyres are still green. I remember getting a new set of Bridgetone some-or-other and driving a couple of hundred miles to an event, then finding the thing just wouldn't grip. It was a warm day so I put the pressures up to see if that would help, and I could barely keep it in a straight line. New tread blocks are very flexible before they've been through a few heat cycles and higher tyre pressure concentrates the forces into a smaller contact patch. After that I learned to run new tyres a couple PSI softer.

Hello Peter. Good point about new tread blocks. I think i'll give them another try at a lower pressure to get some heat in them for a few cycles, maybe that will help. Otherwise they're coming off.