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The mkiv Supra Owners Club

Tyre Size and Model Help


Eightdip

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Hi all,

 

I bought some JR15 wheels recently (18x9.5j et +40 for the front, 18x9.5j et +20 for the rear) and looking at tyre sizes.

 

Thinking of going 265/35/18 all round but will I have issues with clearance on the front?

 

Also, has anyone used Nankang NS-2R tyres before? Seem to be a good trackday option but suitable for road use too

 

Appreciate there are loads of threads about tyre sizes but I couldn't find anything with my specific query!

 

Thanks,

Piers

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I had Yokohama AD08s on a BMW 328i and they were excellent on road and track. NS2's in my experience, you cant get enough heat in them to be decent on the road (had them on 2 track cars) My brother has them on his Megane and they're OK, not brilliant

 

Also should have bought decent wheels :D lol

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Please don’t take this the wrong way but why are you looking to add cheap part worn tyres to the car?

 

What is your budget for new tyres?

 

As for size, 245/40/18 or 255/40/18 for the front and 265/40/18 or 275/40/18 for the rear.

 

For the record I think you are mad for fitting a square set up and those wheels to a Supra.

 

Pilot Super Sports here for just under £168 - https://www.camskill.co.uk/m61b0s3715p102384/Michelin_Tyres_Car_Michelin_SuperSport_Pilot_Michelin_Super_Sport_-_265_40_R18_%28101Y%29_XL_TL_Fuel_Eff_%3A_E_Wet_Grip%3A_A_NoiseClass%3A_2_Noise%3A_71dB

 

Just over £156 here - https://www.tyres-guru.co.uk/product/R-268600?&ID=psm_rdg_uk_shopzilla&Country=GUK

Edited by Frank Bullitt
Links added. (see edit history)
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Thanks for the response Frank, I was hoping to get them to see how 255's look and see if they fit etc. I won't go into an argument for/against part worn tyres with you

 

As for budget, I was looking around £130 a corner maximum really. When you say square set up, do you mean same size front and back?

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Any tyre place should be able to show you an old tyre they have removed to give you a rough idea of the look.

 

You could go for a 35 profile on the front and rear but I wouldn’t recommend it as the Supra suspension can't cope with lower profiles.

 

If running a 35 expect it the car not to handle as well and to feel everything you drive over. 40 will make a much more comfortable ride and importantly make the car more predictable.

 

As for a square set up, yes same width front and back.

Edited by Frank Bullitt (see edit history)
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Thanks I'll give that a go

 

As for profile, I've found the bigger the profile the more wallowy and 'wandery' the car feels in my experience. I'm not fussed with a comfortable ride, I actually prefer a stiffer ride (as the actress said to the bishop)

 

Would you recommend going for a 255 or even a 245 on the front and 265 on the rear or stick with the same all round?

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Tyres usually have an “ideal” foot print on a specific width range, if your wheel is narrower than the ideal width range then the result is sidewalls bow resulting in a squirmy mid corner.

 

Tyres that are mounted on wheels wider than its ideal foot print may result in the “stretched” sidewall which doesn’t create the ideal contact patch and results in reduced grip.

 

High horsepower rear wheel drive means the more “meat” across the rear axle is a requirement to capably deliver power and handling. 40 is known to be the best all round profile.

 

I will also tentatively add my understanding of things go like this...

 

Staggered tyre setups on performance vehicles can help to achieve a desired handling balance. That balance isn’t all about outright grip and performance. They can also encourage a level of predictable handling.

 

Having smaller width tyres on the front axle generally produces understeer near the handling limit.

 

A square tyre setup will produce more front end grip when cornering as the front end of the car feels more “planted” due to the greater contact patch.

 

That said, having never run a square set up I couldn’t advise.

 

You have an option to run the same size all round, 255 front and rear or 265 front and rear. If you want to run different widths go with a 255 for the front and 265 for the rear although this defeats the object of running a square set up.

 

A 245 on the front is going to be stretched and a 275 will more than likely balloon.

Edited by Frank Bullitt (see edit history)
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Ok thanks for all your help Frank!

 

Maybe it's worth giving the full square a go for the research haha, I was thinking because the front end is so heavy that wider tyres would help with that. Though I guess it's counter productive as bigger wheels/tyres are heavier...

 

Will keep you posted if you're interested!

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I have a 245 square setup on one of my Supras, got a good deal on some nearly new winters on eBay, whacked them on my stock 17's ( the rears are 9.5" wide) and no issues. I do so few miles they've even stayed on through the summer. It obviously removes some of the under steer the stock setup has and I would do it again.

 

Saying that on yours clearance might be an issue up front and so 245 255's might be necessary to avoid arch rubbing

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I have a 245 square setup on one of my Supras, got a good deal on some nearly new winters on eBay, whacked them on my stock 17's ( the rears are 9.5" wide) and no issues. I do so few miles they've even stayed on through the summer. It obviously removes some of the under steer the stock setup has and I would do it again.

 

Saying that on yours clearance might be an issue up front and so 245 255's might be necessary to avoid arch rubbing

 

You fitted 9.5 wheels all round to combat the understeer?

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