Wheel and tyre size..... again?

CW comment would be nice here.

Ok, I need to start looking at which wheels and tyres I need.

I like keeping the car as geometrically standard as possable, but now having purchased a big brake kit on the front, im gonna have to go to 18's!

I still want to be able to put the power down, do some drifting etc..... anyone know a proved combonation? Rubber bands = not keen.

cheers.

Lexus GS300 sport wheels

18 inch x 9 at front with 35 profile, and 10 at the back with 30

Lexus GS300 sport wheels

I was thinking that, but im not sure they will t\ke the size rubber im after..... or indeed need...

On the rear you could go up to 305/30/18 on the 10" Lexus rims. Would you need any more than that?

True, but isnt that a massive stretch on a 9.5? Or have I got it wrong and they are 10's?

Yeah they are 10" wide on the rears (Like I said in my first post )

I've got 285/35/18 on mine and it could comfortably take wider, the arches would need rolling though.

Wider tyres only increase lateral grip....so they don't help acceleration.

Don't make the mistake of over tyring the car, unless drag racing is king you need to be able to get the car "dancing" on a circuit. OK, if you have downforce like a "proper" race car, you can use a lot of rubber, but a road car, albeit modded and used on track days needs balance, and overtyring can kill this, grip may increase, but handling, in the truest sense, will probably disappear. You don't need more than 275's on the back, and maybe 245 on the front. As an example my 2WD Skyline runs 265 rears and 235 fronts. I consider it may handle better on narrower rubber still, myself. You also need to consider that the wider you go the lower the tyrewall profile needs to become, and the suspension kinematics of the MKIV means it does not like, nor can it properly use, sections lower than 40% The camber change is such that it NEEDS some sidewall flex otherwise it lifts part of the tread in roll.

I am having some different MKIV springs made, to provide a kit for the more dedicated track day addict, if you don't mind a stiff ride I will be doing a series of 3 different packages in the New Year.

I have a set of AP water cooled six pot calipers here, with pump, lines and reservoir, to make an awesome front package up, great "pub talk" value too, "I have got water cooled calipers from a BTCC Mondeo on my *****"

Thanks Chris much appreciated. So only a 9.5 is needed? or 10 is good? The GS300 rims I know you like.....

Cheers.

9.5 rims should be quite adequate. The Lexus ones are great, everything is spot on, they are forged, correct counter bore size, correct offset, OE quality, powder coated, look (IMHO) great on a MKIV, and fairly light for a road car rim, too.

Wider tyres only increase lateral grip....so they don't help acceleration.

???????? Hmmmmmm.... I think you need to reconsider that

???????? Hmmmmmm.... I think you need to reconsider that

Ok they help but not properly...you need taller tyres for that.

Isn't there something about pressure as well, where if you go to a wider tyre you lower the pressure on the contact patch because the surface area is higher and therefore don't actually get x% more grip with x% more rubber...? Or something like that

Water cooled brakes. Yum. How geeky and futile on a road car - I want them

-Ian

just out of curiousity........how much would you be looking at for a set of the Lexus GS300 rims?

£1220 retail.

So about £1100 if you can negotiate 10% discount