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Michelin Pilot Sport Two (PS2) 225/40/18 92Y Extra Load : Review
Andy:
golf gti on 225/45-17 91w tyres 32psi front 29psi rear
laden speed 35psi front 41psi rear,these are taking out of the michelin tyre fitment book we have at work
Teutonic_Tamer:
--- Quote from: RedRobin on October 23, 2009, 12:12:29 pm ---Perhaps TT and tony_d should try to sort out their differences by PM - It's worked for me and TT in the past.
--- End quote ---
I fear my PMs may be . . . . ignored! :P :laugh:
Teutonic_Tamer:
--- Quote from: maxitrol on October 23, 2009, 12:34:58 pm ---to you find that running your tyre pressures that high TT wear the middle of the tyre out quicker
--- End quote ---
Nope, not at all. Not on the Dunflops, nor the PS2s as used on the GTI. And on other cars when inflated higher than the recommended pressures - nor on ContiSportContact2s, nor Bridgestone S02, nor on Bridgestone ER30, nor on Bridgestone RE040, nor on the original Mich Pilot Sport, or the Pilot Exalto, or the Pilot SX, or the Pilot HX, not the Mich Energy, nor the Mich MXL, and nor the ContiEcoContact2, and nor the original ContiEcoContact, nor the Yokohama AVS Sport and AVS S1Z. So I have very considerable experience, over many, many years - of knowing it is perfectly safe, and does not produce any adverse or uneven wear - when running on a whole load of different tyres - at much higher pressures.
Actually, there was one tyre which did - and that was the Pirelli P Zero Rosso (from my RS4) - but then you had to run them high to get some semblence of stability. And when I binned them, there was a total lack of carcass strength - not only in the sidewalls, but more scarily in the tread area too. They were fairly light though. And come to think of it - EVERY flavour of Pirelli tyre has always been increadibly pressure sensitive in terms of even tread wear.
HTH
Teutonic_Tamer:
--- Quote from: maxitrol on October 23, 2009, 12:40:24 pm ---
--- Quote from: Teutonic_Tamer on October 23, 2009, 12:57:05 am ---
--- Quote from: stealthwolf on October 22, 2009, 11:56:27 pm ---You mean like lorries and tractors? But surely the tyres are designed to withstand such pressure on such vehicles?
--- End quote ---
In some occurances, yes, in others no. And whilst truck tyres may be designed to carry extra weight, and the associated forces - the steel in the bead is identical to a normal car tyre, the carcass materials are the same, even the rubber is fairly similar. And what is more interesting - truck and bus roadwheels are made to exactly the same set of standards and specifications as car roadwheels.
--- End quote ---
the difference in car tyres is they are 4ply meaning the wire is 4x
vans tractors wagons are 6ply upwards meaning they can accept more tyre pressure
ie a trailer tye 195-50-13 is 8ply and takes 90psi
--- End quote ---
Yes, agreed to a certain extent about the ply ratings. But when you look at a 4ply car tyre - which can carry say a 2.5 tonne car (fully loaded - total mass shared by all tyres) - doubling the ply rating to 8ply doesn't give you a total of 5 tonnes - but will actually take you into the 44 tonne realms (yes, there will be more wheels - but it is still possible to get a two axle tractor unit with just twin-rears above the fifth wheel) - it is actually the 'air pressure' which supports the load, not the 'ply rating'. Anyway - this is wayyyy to geeky for a PS2 thread.
--- Quote from: maxitrol on October 23, 2009, 12:40:24 pm ---think this has gone a bit of topic now
--- End quote ---
Not me, M'Lud, honest! :laugh: :laugh: :laugh: :laugh:
Teutonic_Tamer:
--- Quote from: maxitrol on October 23, 2009, 12:48:58 pm ---golf gti on 225/45-17 91w tyres 32psi front 29psi rear
laden speed 35psi front 41psi rear,these are taking out of the michelin tyre fitment book we have at work
--- End quote ---
Sadly, the Michelin Car Tyre Fitment and Pressure Guide (I have one on my desk as I type) has some fundamental errors (covered by their 'obligatory' disclaimer) - because they list the Mk5 GTI as being available with 16" rims - in the UK market.
And regarding their stated tyre pressures - allow me to quote verbatum:
--- Quote from: Michelin Car Tyre Fitment and Pressure Guide, page 99 and back cover ---"The tyre pressures given in this book are for indication only.
Please refer to the vehicle manufacturer's advice (eg in the vehicle handbook, on the door pillar or fuel filler cap) for the specific tyre pressure information on a particular vehicle."
--- End quote ---
So it is pretty irellivent what Michelin themselves recommend. Those pressures recommended by tyre manufactures are generally just a 'ball park' figure for lazy tyre fitters, or tyre fitters who don't have access to the handbook or whatever.
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