11 replies to this topic

[MAXR]

I don't want to ruin the handling of my VX, make it tramline, understeer or upset the suspension, but want some additional grip without going to slicks. Can anyone who has tried 18/17's let me have some feedback. What size tyres, offsets and brand of tyres did you use? 

 

cheers

[mbes2]

Doesn't Nev run this setup ?

[fiveoclock]

It'll make it change direction slower

[MAXR]

I thought there would be compromises. The problem is, now that my car has grown dramatically in width and length, 17/16" wheels look really silly.

 

I'd need to fit at least 17" 225's possibly 235's on the fronts and 18" 275's on the rear. I do like my Porsche compound tyres, they are amazing!

[Nev]

Easier to ring me Max, too much to type on here really. I've tried 16", 17", 18" on the fronts. Have sent you a PM.

[Aerodynamic]

I thought there would be compromises. The problem is, now that my car has grown dramatically in width and length, 17/16" wheels look really silly.

I'd need to fit at least 17" 225's possibly 235's on the fronts and 18" 275's on the rear. I do like my Porsche compound tyres, they are amazing!

275/40 17 exist as as R tires for the most common tires like R888r and V70.

And 245 xx 16 as front?

[2-20]

A French guy tested different tires and wheels combo 7 years ago and his conclusion was that 17/18 was the fastest on his turbo Speedster.
Some details in the link... It's in French but you can see the track time listed.

http://www.myspeedst...=780376#p780376

[fiveoclock]

A French guy tested different tires and wheels combo 7 years ago and his conclusion was that 17/18 was the fastest on his turbo Speedster.
Some details in the link... It's in French but you can see the track time listed.

http://www.myspeedst...=780376#p780376

All depends what type of track it was done on

[siztenboots]

would be obvious which wheel and tyre combo was lightest , you will notice the gyro effect on the fronts.

anyway unsprung mass and all that

[Nev]

IMO (and empirical experience) it's not just about the wheel/tyre weight/width or circumference, offset and % profile has a strong influence, particularly the former. IMO the car needs a high profile tyre (i.e. lots of sidewall height) to absorb all the little stuff.

 

I have 16", 17" and 18" front wheels for my car (all shod with tyres) and swap them round depending on conditions. I also swap around the ARB settings and offsets from time to time.

 

For the front, the 18" x 245 cause understeer, partly as it's hard to warn them up, and partly due to the necessary ET15 offset to get them to fit - this in turn causes scrub (which in turn (i think) causes the understeer).

Edited by Nev, 19 September 2018 - 06:47 PM.

[2-20]

 

A French guy tested different tires and wheels combo 7 years ago and his conclusion was that 17/18 was the fastest on his turbo Speedster.
Some details in the link... It's in French but you can see the track time listed.

http://www.myspeedst...=780376#p780376

All depends what type of track it was done on

 

 

Yes of course...

Tests were done on Nogaro track

https://www.circuit-...n-du-circuit-45

 

Many videos on the net

[Nev]

 

 

A French guy tested different tires and wheels combo 7 years ago and his conclusion was that 17/18 was the fastest on his turbo Speedster.
Some details in the link... It's in French but you can see the track time listed.

http://www.myspeedst...=780376#p780376

All depends what type of track it was done on

 

 

Yes of course...

Tests were done on Nogaro track

https://www.circuit-...n-du-circuit-45

 

Many videos on the net

 

 

Shhhhsh, don't let them all know.

 

Ultimately it's all about nimbleness and how much you are willing to sacrifice in  "change of direction" vs "outright lateral grip".