Tyre profile choices

Im changing my wheels back down to 18's now and have been looking at tyres

Main reason is now my single is all set up i want to try and maximise traction so the idea of a smaller wheel and larger profile seems to make sense

Im just trying to find out why the premium type tyres like R888, AD08R etc only seem to offer a 30 profile for anything wider than a 275?

Im trying to get the best size tyre i can but for me the optimum profiles for 18's on a supra would be a 40 profile up front, and a 35 on the rear, where as the 30 profile at the back seems more suited for a 19" wheel

After looking at the AD08R the 255 offer a 40 profile, but 285 and 295 only come as 30 which doesnt seem like it will match very well

Would there be any real benefits going from a 235/35/19 & 275/30/19 over to a 255/35/18 & 295/30/18?

I know they are wider but wider doesnt always mean better traction and from my understanding the profile plays a massive part in traction so i dont get why these top tyres dont seem to offer more choice, i know width also affects the profile size too which may answer my question

I'm on 235/40/18 and 265/35 18 and I think grip is pretty good. My mates car has 245/40/18 and 315/35/18 and whilst grip in the dry is great, the hydroplaning is terrible in the rain. Gets to the point where it's scary to drive but also fun.

The profile is a percentage of the width, so a 30 profile on a 315 is going to give a larger sidewall than a 30 profile on a 265/275 etc. In fact, a 315/30 has a bigger sidewall (94.5mm) than a 265/35 (92.75mm).

A benefit of dropping to an 18" would be that you could get more sidewall in there due to losing 1" diameter on the rim. 275/30/19 is only 0.4" smaller than 285/35/18 for example. A 295/30/18 would give a bigger sidewall, bigger width and more arch clearance due to being smaller in diameter. The tyres are probably cheaper too.

I run a 295/30/18 R888 on the rear just now and don't have any traction issues whatsoever.

Currently running:

front: 8.5jx18 235/40/18

rear: 9.5jx18 275/40/18

Only had them on for a few weeks, but pretty convinced this is the best compromise for a road car. No noticeable downsides over the 35, but the ride quality on the rear of the car is much improved. Need to check my speedo still though to check how accurate it is now, although I'm expecting some leeway as it read too low before.

No grip issues here either mate and I'm running Fronts 265/35/18 and the Rears 295/35/18.

I have recently changed my wheels and tyres.

I now have 8.5j fronts with a 225 40 18

10j rear with a 265 35 18

go for a Jamie Fosta style mate, drag wheels on the rear... I'm tempted with that mainly for the ride quality. My 19s are on a 30 profile, you can feel it

No grip issues here either mate and I'm running Fronts 265/35/18 and the Rears 295/35/18.

Any pics dude? I'm just about to buy tyres and was thinking of 295/35/18 on a 10J. Alternatively I was looking at a 275/35/18.

Cheers

go for a Jamie Fosta style mate, drag wheels on the rear... I'm tempted with that mainly for the ride quality. My 19s are on a 30 profile, you can feel it

Supra's with 30's on 19's have ride quality comparable to a Fakir's bed.

40's on 18's is as low a profile that works properly on a Supra.

Any pics dude? I'm just about to buy tyres and was thinking of 295/35/18 on a 10J. Alternatively I was looking at a 275/35/18.

 

Cheers

Give me a few hours mate and when back from London I'll get you some photos.

Supra's with 30's on 19's have ride quality comparable to a Fakir's bed.

 

40's on 18's is as low a profile that works properly on a Supra.

40's may be more comfortable, but using a 255 width tyre as an example, 35's on an 18 are practically identical to the 17''/40/255's that left the factory.

Give me a few hours mate and when back from London I'll get you some photos.

 

/QUOTE]

No probs, are yours on a 10J though?

 

 

No probs, are yours on a 10J though?

 

/QUOTE]

18x10 7.25 and 18x11 8.25. Fronts are 265/35/18 and the Rears 295/35/18.

 

Bet that doesn't help [emoji6]

 

 

18x10 7.25 and 18x11 8.25. Fronts are 265/35/18 and the Rears 295/35/18.

 

Bet that doesn't help [emoji6]

 

/QUOTE]

 

Not really, I was hoping the 295/35 was on a 10J But thanks anyways.

 

Anyone else run that combo?

Not really, I was hoping the 295/35 was on a 10J But thanks anyways.

 

Anyone else run that combo?

I was running 285/30/18's on my 10.5j rears.

Members with 30 profile tyres on their Supra should be banned and those with 35 profile tyres should be laughed at regularly.

Slammed on 30's is cool

Members with 30 profile tyres on their Supra should be banned and those with 35 profile tyres should be laughed at at every opportunity.

Your rationale being?

Your rationale being?

The squidge of a tyre is an essential activity for suspension designed to use it, without this squidge the suspension cannot work properly and will crash along like a Fakir's bed increasing the odds of finding a ditch.

If you won't believe me, try believing Chris Wilson.

The squidge of a tyre is an essential activity for suspension designed to use it, without this squidge the suspension cannot work properly and can/will crash along like a Fakir's bed.

 

If you won't believe me, try believing Chris Wilson.

I believe both you and Chris Wilson, but would like to state my car feels as refined and comfortable as a ponies ass on the existing setup.

I believe both you and Chris Wilson, but would like to state my car feels as refined and comfortable as a ponies ass on the existing setup.

That's your problem right there, your Supra should feel as refined and comfortable as Baby Bears bed.

The squidge of a tyre is an essential activity for suspension designed to use it, without this squidge the suspension cannot work properly and will crash along like a Fakir's bed increasing the odds of finding a ditch.

 

If you won't believe me, try believing Chris Wilson.

The squidge of a tyre is an essential activity for suspension designed to use it, without this squidge the suspension cannot work properly and will crash along like a Fakir's bed increasing the odds of finding a ditch.

 

If you won't believe me, try believing Chris Wilson.

I'm sorry but that's BS. I've run everything from 45's down to 30's on my supra, and the only negatives I can list are increased harshness over bumps and less grip in the wet/cold.

From what I've experienced, the 30's I had were a little much for day to day travel, but worked great on the track. The 45's I used were terrible for anything but sedate driving. I could feel the sidewalls flexing when pushing it through the corners. Not great for inspiring confidence, especially as Supra is a heavy car that likes to understeer from the factory.

I'd rather sacrifice some road comfort and the loose stock handling feel for more grip and a stiffer ride.

increased harshness over bumps and less grip in the wet/cold.

Exactly.

All roads have bumps and it frequently rains here in the UK.

Exactly.

 

All roads have bumps and it frequently rains here in the UK.

I suggest you stay in bed then. Nice, soft and cosy in there.

You cant paint all tyres with the same brush regarding sizes though.

The profile size is a percentage of the width.. therefore a 295 30 18 wont have the same side wall depth as a 225 30 18 thus making your coment completely redundant?

I may be wrong here and i dont claim to be any sort of tyre size genius but i dont understand how you can say 30 profile tyres are bad without also stating a width?

:d He has a point David, perhaps you are too old and knackered for a Supra these days

I suggest you stay in bed then. Nice, soft and cosy in there.