Rear tyre choice

[toomanyhorses]

Try www.camskill.co.uk

regards loz

"No Stock & No Delivery Date", sadly. Normally my first place to check...

 

[toomanyhorses]

Off track a bit but just fitted Vred winter tyres to my Disco. Hard to get but good value and great tyres.

Have heard that. Have Kumho's on my 4x4. Not main stream either, but excellent too

 

[Emtee]

I'm having a pair of 452's fitted to my 4200 on Wednesday (Blackcircles), to replace the 452's already fitted. They've performed faultlessly both on and off track, through summer and last winter, and through many pot-holes.

With regards to the Vred's, I do have to say that I've heard of a few issues on this forum that have made me wary.

If you want a bit of extra rim protection, then over-size whichever tyre you choose. Details below...

Rear Standard.

265/35/18 - Overall tyre diameter of 643mm. Circumference of 2019mm. 797 revolutions per mile.

Rear Options.

275/30/18 - Overall tyre diameter of 622mm (a difference of -21mm or -3.27% against standard). Circumference of 1955mm. 823 revolutions per mile.
275/35/18 - Overall tyre diameter of 650mm (a difference of +7mm or +1.09% against standard). Circumference of 2041mm. 788 revolutions per mile.

285/30/18 - Overall tyre diameter of 628mm (a difference of -15mm or -2.33% against standard). Circumference of 1973mm. 815 revolutions per mile.
285/35/18 - Overall tyre diameter of 657mm (a difference of +14mm or +2.18% against standard). Circumference of 2063mm. 780 revolutions per mile.


Front Standard.

235/40/18 - Overall tyre diameter of 645mm. Circumference of 2027mm. 794 revolutions per mile.

Front Options.

245/35/18 - Overall tyre diameter of 629mm (a difference of -16mm or -2.48% against standard). Circumference of 1975mm. 815 revolutions per mile.
245/40/18 - Overall tyre diameter of 653mm (a difference of +8mm or +1.24% against standard). Circumference of 2052mm. 784 revolutions per mile.

255/35/18 - Overall tyre diameter of 636mm (a difference of -9mm or -1.4% against standard). Circumference of 1997mm. 806 revolutions per mile.
255/40/18 - Overall tyre diameter of 661mm (a difference of +16mm or +2.48% against standard). Circumference of 2077mm. 775 revolutions per mile.


One of the calculators I used advised no more than +/-2.5% variance in diameter.

So to add a little bit more rubber to protect your rims, wider by 10mm with no change to the sidewall ratio is best whether front or back. If you want to add 20mm, then again leaving the ratio unchanged is probably the most consistent between front and back, but your speed and mileage readings will be further off.

 

[rotorheadcase]

The issue with over sizing the tyres for the rim is too much sidewall flex, which defeats the purpose of having performance tyres in the first place. The widest you should reasonably go on the front is 245 and 275 on the rear with a standard wheel.

If you want a more progressive tyre try the Michelin Pilot Sport or the Pirelli Rosso Corsa, but be prepared to replace they every two years or so. I run standard Rossos on my Maserati and on the 911 and have always found them to give good grip and they slide very predictably provided they have good tread depth and more importantly not older that a couple of years. They do lose performance with age regardless of tread depth.

Neil

 

[adam01]

The issue with over sizing the tyres for the rim is too much sidewall flex, which defeats the purpose of having performance tyres in the first place. The widest you should reasonably go on the front is 245 and 275 on the rear with a standard wheel.

If you want a more progressive tyre try the Michelin Pilot Sport or the Pirelli Rosso Corsa, but be prepared to replace they every two years or so. I run standard Rossos on my Maserati and on the 911 and have always found them to give good grip and they slide very predictably provided they have good tread depth and more importantly not older that a couple of years. They do lose performance with age regardless of tread depth.

Neil

Neil

Have the Corsa's, not impressed in damp/wet conditions but being a semi track tyre I guess thats par for the course. Yet wear out just by looking at them

Might try the Mich's next but believe they are no better in similar wheather

 

[rotorheadcase]

No such thing as a good all rounder...you always sacrifice something. Yes, I've run the Michelins before and they are no better in the wet. The Continental Sport Contacts 3 are not as sticky but give far superior wet weather traction so might be another option.

Neil

 

[Parisien]

You need to check the tread wear code on their side too.....


P

 

[Parisien]

UTQG Ratings

Passenger car tyres are accompanied by a UTQG Rating (Uniform tyre Quality Grading, mandated by the Federal Government) which rates the tread life of tyres by looking at tread wear, traction and temperature resistance. The UTQG Rating is usually found opposite the tyre size markings and will be in three separate ratings: treadwear, traction and temperature.

The treadware grade standard is 100. A grade of 200 means the tread would wear twice as well as a tyre graded 100.

Traction grades run from AA to C, with AA being the highest grade and C meaning the tyre brakes poorly on both wet concrete and wet asphalt.


P

 

[toomanyhorses]

The UTQG Rating of the Vreds is 280 AA A, the F 452's are 300 AA A (same as the new Michelins), so rating much on a par.

The online reviews have slightly swung it for the Vreds for me though, for what I'm looking for.

Could I find any UK 265 stock? No :[

So, following Mile's advice re next best size, I've ordered the 275/35/18's in the Vreds which should be with me tomorrow, (though they are about 100 quid each more in that size) and hope that they are as rigid as the 265's.

Will post an update in due course.

Thanks all again for your pointers and excellent advice.

 

[rs48635]

The UTQG Rating of the Vreds is 280 AA A, the F 452's are 300 AA A (same as the new Michelins), so rating much on a par.

The online reviews have slightly swung it for the Vreds for me though, for what I'm looking for.

Could I find any UK 265 stock? No :[

So, following Mile's advice re next best size, I've ordered the 275/35/18's in the Vreds which should be with me tomorrow, (though they are about 100 quid each more in that size) and hope that they are as rigid as the 265's.

Will post an update in due course.

Thanks all again for your pointers and excellent advice.

Seems the UTQG holds true, F452 on mine are lasting soooooooo long. Want to try the sticky pirellis again.
Anyone know the UTQG treadwear value for them?

 

[ENZ525]

Seems the UTQG holds true, F452 on mine are lasting soooooooo long. Want to try the sticky pirellis again.
Anyone know the UTQG treadwear value for them?

Don't have my QP here at the moment, so can't check those,
but here are the numbers on my 550:

P Zero Rosso
Rear - 295/35/18 (99Y) load rating...160 / AA / A
Front - 255/40/18 (95Y) ......"........220 / AA / A

Pretty sure the rears on my QP have a load rating of 101Y, so will be interesting to see what the UTQG ratings are.

 

[rs48635]

Thanks Enzo

Seem to recall the 3200 AC shipped with teh super stick rosso corsa tyres which might even have been treadwear 100!

 

[maserati]

Don't have my QP here at the moment, so can't check those,
but here are the numbers on my 550:

P Zero Rosso
Rear - 295/35/18 (99Y) load rating...160 / AA / A
Front - 255/40/18 (95Y) ......"........220 / AA / A

Pretty sure the rears on my QP have a load rating of 101Y, so will be interesting to see what the UTQG ratings are.

Hi Enzo,

The rears on my QP have the nineteen inch wheels. The size is 285 35 ZR 19 with a load index of (99Y)

Regards,

Paul

 

[ENZ525]

Hi Enzo,

The rears on my QP have the nineteen inch wheels. The size is 285 35 ZR 19 with a load index of (99Y)

Regards,

Paul

Hi Paul,
The OEM wheels on mine are 18s and run P Zero Rosso,
Fronts are 245 / 45 ZR 18 and are (100Y)
Rears are 285 / 40 ZR 18 (101Y)
Just don't have the UTQG ratings to hand.

I also have a set of 19s for the QP, running P Zero rosso's,
Fronts 245 / 40 ZR 19 (98Y) - 220 / AA / A
Rears 285 / 35 ZR 19 (99Y) - 160 / AA / A

Will be interesting to see if the higher load ones have different UTQG ratings

Regards,
Enzo.

 

[toomanyhorses]

The 265/35/18 rossos I currently have on the rear are 220 AA A

 

[maserati]

Hi Paul,
The OEM wheels on mine are 18s and run P Zero Rosso,
Fronts are 245 / 45 ZR 18 and are (100Y)
Rears are 285 / 40 ZR 18 (101Y)
Just don't have the UTQG ratings to hand.

I also have a set of 19s for the QP, running P Zero rosso's,
Fronts 245 / 40 ZR 19 (98Y) - 220 / AA / A
Rears 285 / 35 ZR 19 (99Y) - 160 / AA / A

Will be interesting to see if the higher load ones have different UTQG ratings

Regards,
Enzo.

Enzo,

I didn't know you had both sets of wheels for your QP. Do you notice any difference between the eighteen and nineteen inch wheel and tyre configurations?

Regards,

Paul

 

[ENZ525]

Enzo,

I didn't know you had both sets of wheels for your QP. Do you notice any difference between the eighteen and nineteen inch wheel and tyre configurations?

Regards,

Paul

Hi Paul,
The 19s are Khans that I bought for the track, so have only used them getting to/from Llandow!
there is a small difference in feel, but not as big as I thought there might be,
could be because the 18s have a higher load index, makes them just a little bit stiffer on the sidewall..
Regards,
Enzo.

Couple of pics...

 

[maserati]

Enzo,


Ah yes I remember now seeing you tearing around the circuit at Llandow....... What lovely pictures of your car. It does you credit.


Paul

 

[spydercc2002]

grip is all that matters
kumho ecsta v70a

 

[toomanyhorses]

Enzo,

Those Khans do really transform the appearance. The originals look Gentlemanly, restrained even. The Khans give it a sporting look, whilst retaining the elegance and really suit it too. What a good choice