Tireetim
Member Since: 08 Apr 2012
Location: Isle of Tiree, Scotland
Posts: 26
  
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The plate on the drivers door of my D4 says that tyre pressures should be 33psi at the front and 36psi at the rear. This seems pretty low and I think is the reason that one of my front tyres got pinched on a curb. For road use, is there any reason why I can't run them at about 40psi to avoid having that bulge that they seem to have at 33?
Thanks.
Tim.
This post has been edited by the site administration team
Moved to "Wheels & Tyres"
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 3rd Jul 2012 10:24 am |
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Fudpucker
Member Since: 30 Jan 2012
Location: Banbury
Posts: 202
 
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I run my D3 19" wheels/tyres at 36 front 40 rear with no problems.
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| 3rd Jul 2012 10:45 am |
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Biffysun
Member Since: 09 Jul 2011
Location: Central
Posts: 1788
 
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me got 18"s, 8) at alignment check guy suggested 36F and 38R, so far car seems fine and tyres wearing normally 
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| 3rd Jul 2012 12:17 pm |
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NJSS
Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10614
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The figures quoted by the manufacturer are really only for guidance, and much will depend on the tyres you have fitted, the load, the weather (hot/cold, wet/dry/icy) and the surface on which you will be driving.
A crude test is the so called "chalk test".
Find a quiet flat place with a smooth tarmac surface.
Draw a chalk line across the tread of a tyre and drive forward at least one vehicle length.
The chalk line should have, in part transferred to the road surface. The line should be the
full width of the tyre.
If the shoulders are missing then the tyre is over inflated, & the centre of the tread will wear faster.
If the centre of the line is missing the tyre is underinflated, & the edges of the tyre will wear faster.
Repeat for all four wheels, and adjust pressures until perfect.
I have done this in the past, but you get and eye & feel for tyre pressure.
I run GG AT2's at 38F & 42R. Don't rely on forecourt pressure gauges, or those built into a pump.
Read this review:-
http://www.autoexpress.co.uk/products/prod...ested.html
and get a decent gauge - I have a Draper in the car & in the workshop.
NJSS Am I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
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| 3rd Jul 2012 1:37 pm |
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