How do stretched tyres perform

As title says really. I'm buying new wheels, i'm probably going for 8.5j all round, which means i wont be stretching tyres, but if i end up going 9.5-10j on the back, how would say a 245 40 perform on a rim that size?

I run a 225/40 on an 18x10 front & 255/40 on a 18x10 rear, and its fine, they have stiffer sidewalls and if you stretch more then this then you risk popping the tyre off the rim, with a effectively harder sidewall you loose the sidewall impact absorbtion properties

As title says really. I'm buying new wheels, i'm probably going for 8.5j all round, which means i wont be stretching tyres, but if i end up going 9.5-10j on the back, how would say a 245 40 perform on a rim that size?

I have 10J rears with 285s and 9.5J fronts with 245/40/18 and they're fine. They don't look stretched to me, and they're only one size lower than the optimal 255 or 265 on a 9.5J

Cheers guys. Reason i ask is when i had 275 35's on 10j 18's on the supra i didnt like it. So i dont wanna over-tyre the soarer and end up preferring the way it drives on the original 16's 225's right now.

So, if i was to go for 245 on 10j's on the rear, i'd have a decent amount of grip, but not too much for a bit of skidability?

Like stretched condoms, unreliable to dangerous, depending on what you are doing.

Like stretched condoms, unreliable to dangerous, depending on what you are doing.

Cheers Chris. What it looks like I'll be going for is 8.5j on the front with 225 tyres, and 9.5j the rear with 235. Fronts according to tyre websites aren't classed as stretch at all, and rear it says minimum 245 really on 9.5j, so 235 should be ok as in hardly stretched at all?

I run 255 35 18 toyo t1r on a 10" wide at the rear. I have had no problems but only run them as i got hold of them cheap. Will be goin for 265 or 275 next time though. They are only a little bit more to buy anyway.

I have got to be boring and say the tyre manufacturers don't make up these recommendations for fun, you would be in a grey area in a serious accident.

I don't understand why you would want to fit such narrow tyres? 235 on the front 255 or 265 on the rear will give you much better handling, ride quality and grip levels.

Wider tyres for the win!

Maybe it's a wheel-rim hate-fetish thing.

Ibrar must love it.

Wider tyres for the win!

What the hells happened to those tyres ?

I think they are a road legal tyre in the usa, crazy yanks. Micky thomlinson's maybe. Im sure some dude on here will know what they are.

poorly!

Like sh!t.

micky thomlinson's maybe.

There is a guy on the MB forum who runs his like this

Here's a stretch-fest that I'm pleased is not a thread on here.

http://zilvia.net/f/chat/136032-most-extreme-tire-stretch-thread.html

There is a guy on the MB forum who runs his like this

Now that is a stretch !!!

255 on a 10" rim is not a stretch, not even according to guidelines and I am sure that Porsches run this much "stretch" as standard

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There is a guy on the MB forum who runs his like this

Now that is a stretch !!!

255 on a 10" rim is not a stretch, not even according to guidelines and I am sure that Porsches run this much "stretch" as standard

I don't 'get' stretched tyres. The car's handling MUST be compromised / dangerous as a result of doing it AND it looks sh!t as well, like you bought the wrong size and thought "oh well, it'll do..." Baffling.

I don't 'get' stretched tyres. The car's handling MUST be compromised / dangerous as a result of doing it AND it looks sh!t as well, like you bought the wrong size and thought "oh well, it'll do..." Baffling.

The issues with what people class as stretch is that it is so diverse, I run 255 on a 10" rim some people calll that stretch where a friend of mine runs a 215 on a 10" and that is Stretch

The issues with what people class as stretch is that it is so diverse, I run 255 on a 10" rim some people calll that stretch where a friend of mine runs a 215 on a 10" and that is Stretch

Both a stretch IMO, just one is more extreme than the others.

To the op... what is your reasoning for wanting undersized tyres? The way I'm reading it is that you want decent grip? Seems strange to go down this route.

I have relatively stretched rear tyres and I hate the look. The grip was fine, at BPU, but I dare say it could be a lot better. Stretched tyres will be a LOT more twitchy in the bends and the limit will be a far more narrow zone.

Don't compromise on rubber if you actually want decent handling. If you're after the "stance" look then go for it, choose one though... you can't have both. Absolutely anything in between is compromising (guilty as charged but I got what I got with the wheels).

...and rear it says minimum 245 really on 9.5j, so 235 should be ok...

I just love your logic here.