4200 coupe rear tyre size

[gt86driver]

Now how about a new topic gents?
Excuse me as I crawl under a rock


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[GeoffCapes]

In all honesty. I think it is a false economy fitting cheap tyres to a high performance car.

At best you are saving money on tyres.
At worst you are putting yourself, your passengers and other road users and pedestrians in danger through fitting sub standard tyres.

It could end up costing you way more than you are saving.

To me, it's just not worth the risk.

 

[gt86driver]

In all honesty. I think it is a false economy fitting cheap tyres to a high performance car.

At best you are saving money on tyres.
At worst you are putting yourself, your passengers and other road users and pedestrians in danger through fitting sub standard tyres.

It could end up costing you way more than you are saving.

To me, it's just not worth the risk.

I originally tried them on my gt86 after looking at medium range tyres, and liked them so much I got them on the 4200

Even though I don't push the mc to its limit.
& The tyres performance is satisfactory being a Chinese brand leaves its safety at question.

Maybe I better look at different options.
I appreciate the concern guys.





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[conaero]

Go Goodyear F1's, on tyreleader.co.uk they are pretty inexpensive for the quality they are. If you want to spend more, get Michelins.

 

[davy83]

I also would go for good year F1's a good compromise for grip and cost, ok in the wet and not too uncomfortable. I agree the tyres look too stretched especially at the rear and I have tried oversized tyres to get some sidewall protection with few issues. PM me I can share what I have tried.

 

[MrPea]

I have the Super Sports on all for wheels and frankly they're epic. Totally transformed an already excellent car when I put those on. They also give me far more confidence in wet or greasy conditions than the p zero rossos that helped me total my first maser.

 

[allandwf]

Never scrimp on tyres, after all you have 4 palm sized contact areas between you and the road, not much! Personally if I am looking for a car, unless it is exactly the spec I want, if it has budgets on I will walk away.

 

[FIFTY]

On going debate aside I am interested to hearing an answer to the OPs question... how wide can you get the rear tyres on the standard 18s without sending the traction/stability control into a frenzy?

If I was going down this route I'd push it up from 265 to maybe 285/290 and increase the fronts a little but too much will induce understeer

But really the problem with the handling on these cars is the skyhook suspension so if you are trying to eradicate the floating sensation into the apex of a corner and the nervousness while feeding the power in on the exit then I suggest some proper suspension mods... springs and anti roll bars... or beter yet instead of springs get adjustable coilovers then you can have a nice ride combined with good handling if set up properly

 

[gt86driver]

On going debate aside I am interested to hearing an answer to the OPs question... how wide can you get the rear tyres on the standard 18s without sending the traction/stability control into a frenzy?

If I was going down this route I'd push it up from 265 to maybe 285/290 and increase the fronts a little but too much will induce understeer

But really the problem with the handling on these cars is the skyhook suspension so if you are trying to eradicate the floating sensation into the apex of a corner and the nervousness while feeding the power in on the exit then I suggest some proper suspension mods... springs and anti roll bars... or beter yet instead of springs get adjustable coilovers then you can have a nice ride combined with good handling if set up properly

Iv heard FD Springs & stabilizer bar upgrade do wonders. but do you think the skyhook dampers & shocks can handle it?
My coupe Being 15years old but only 45k kms

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[Zep]

I have read up on tyre sizes before, wider tyres do not necessarily mean more grip.

Tyre grip is a function of both the size of the tyre (contact patch), the stiffness of the belt and shoulder - a stiffer belt means the tyre doesn't deform around imperfections in the road, reducing the contact patch reducing grip, conversely a stiffer tyre will resist higher slip angles, increasing grip - providing it is in contact with the road. The suspension geometry, wheel width and rubber compound also impact.

The stability control is of less concern, traction control and ABS compare rotational speed, but as the front and rear tyres on our cars already have different circumferences and those circumferences vary significantly with tyre wear, minor differences here are unlikely to be telling. Stability control uses yaw sensors and so again is unlikely to be affected.

You could go as far as a 285/40/18 with only a 1.2% increase in the rolling circumference, but the recommended wheel width is 10†(our wheels are 9.5â€) so it will look pinched and this will also affect grip.

In short, it would be very difficult to predict the affect of wider tyres without considering all these and other variables, so in the end it would be trial and error. If you decide to change, good luck, I hope it works out for you, let us (and your insurance company!) know how you get on.

 

[FIFTY]

Iv heard FD Springs & stabilizer bar upgrade do wonders. but do you think the skyhook dampers & shocks can handle it?
My coupe Being 15years old but only 45k kms

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The FD springs are firmer than the H&R ones they might put more stress through the shocks and at this age they can start leaking or failing actuators but it's not that common. Personally I want to fit the KW V3 coilovers but they cost to buy and fit so I will need to save my pennies and hope there is no more unplanned maintenance for a while. I only want to lower the car by 1" and set it up for fast road, the coilovers will be much more forgiving on Britain's appalling roads.

I have read up on tyre sizes before, wider tyres do not necessarily mean more grip.

Tyre grip is a function of both the size of the tyre (contact patch), the stiffness of the belt and shoulder - a stiffer belt means the tyre doesn’t deform around imperfections in the road, reducing the contact patch reducing grip, conversely a stiffer tyre will resist higher slip angles, increasing grip - providing it is in contact with the road. The suspension geometry, wheel width and rubber compound also impact.

The stability control is of less concern, traction control and ABS compare rotational speed, but as the front and rear tyres on our cars already have different circumferences and those circumferences vary significantly with tyre wear, minor differences here are unlikely to be telling. Stability control uses yaw sensors and so again is unlikely to be affected.

You could go as far as a 285/40/18 with only a 1.2% increase in the rolling circumference, but the recommended wheel width is 10” (our wheels are 9.5”) so it will look pinched and this will also affect grip.

In short, it would be very difficult to predict the affect of wider tyres without considering all these and other variables, so in the end it would be trial and error. If you decide to change, good luck, I hope it works out for you, let us (and your insurance company!) know how you get on.

Which is why you would want a tuning company to go through that trial and error and deliver a nice package if you want to turn a 4200 into a track monster. I do envy the "tuning" market they have over in the US, their car culture really is on a different level... I think we're either a bit too boring or too much on the other extreme with the "max power"/"doing burnouts in staples car park scene" in the UK

 

[gt86driver]

I have read up on tyre sizes before, wider tyres do not necessarily mean more grip.

Tyre grip is a function of both the size of the tyre (contact patch), the stiffness of the belt and shoulder - a stiffer belt means the tyre doesn't deform around imperfections in the road, reducing the contact patch reducing grip, conversely a stiffer tyre will resist higher slip angles, increasing grip - providing it is in contact with the road. The suspension geometry, wheel width and rubber compound also impact.

The stability control is of less concern, traction control and ABS compare rotational speed, but as the front and rear tyres on our cars already have different circumferences and those circumferences vary significantly with tyre wear, minor differences here are unlikely to be telling. Stability control uses yaw sensors and so again is unlikely to be affected.

You could go as far as a 285/40/18 with only a 1.2% increase in the rolling circumference, but the recommended wheel width is 10†(our wheels are 9.5â€) so it will look pinched and this will also affect grip.

In short, it would be very difficult to predict the affect of wider tyres without considering all these and other variables, so in the end it would be trial and error. If you decide to change, good luck, I hope it works out for you, let us (and your insurance company!) know how you get on.

Nice writeup.
I think im 'sticking' to stock size

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[CatmanV2]

Tyre *width* shouldn't make any difference to the traction control. As Zep says, it's rotational speed, not tarction that the electronics are concerned about.

C