The Triumph Dolomite Club - Discussion Forum
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Tyre pressures
http://forum.triumphdolomite.co.uk/viewtopic.php?f=5&t=33577
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Author:  Galileo [ Sat Feb 03, 2018 11:06 am ]
Post subject:  Tyre pressures

Googling my Fourtrak tyre pressure ("4 PSI rule"), as I had forgot what they are when using 31" tyres, came across this wild statement from Cooper Tires:
Quote:
"Beware of vehicle placards with recommendations below 30psi.
Some older vehicles may still show lower pressures which were
used to “enhance” ride but resulted in poor tyre life and in some
circumstances are dangerous."
https://www.coopertires.com.au/media/14 ... ssures.pdf

Author:  Galileo [ Tue May 15, 2018 12:30 pm ]
Post subject:  Re: Tyre pressures

Having just bought new Falken tyres I asked them for a pressure recommendation and they have kindly supplied me with a certificate, which is good enough for me to supply to the insurance company if needed to explain why I've inflated them more than the 70s tyre pressures suggested by BL.

2 bar front/ 2.2 bar rear - Attached the PDF if anyone else wants it.

Edit: Better add that was for a Sprint, also attached a translation from the German!
Image

Attachments:
201805208.pdf [18.34 KiB]
Downloaded 32 times

Author:  Mahesh [ Tue May 15, 2018 1:11 pm ]
Post subject:  Re: Tyre pressures

Incredible,

I've been setting up 29f, 31r because it felt right.

Author:  Galileo [ Tue May 15, 2018 1:29 pm ]
Post subject:  Re: Tyre pressures

I'm not surprised Mahesh, I put the new rubber on and it was like driving on flat tyres over the old ones, not a pleasant experience cornering. which is why I thought I'd ask the question,. Going to adjust upwards when I get home!

Author:  Mad Mart [ Tue May 15, 2018 1:57 pm ]
Post subject:  Re: Tyre pressures

I put 30psi all round for as long as I can remember.

Author:  Galileo [ Tue May 15, 2018 3:36 pm ]
Post subject:  Re: Tyre pressures

Seen a few old posts that you've been in Mart but everyone always comes on and says that we run the risk that the insurance would be invalid, so having paperwork to mitigate has put my mind at rest. It's good to hear that others like you and Mahesh's real world experience matches what the tyre supplier suggests, taking into account that the 2.2 bar for the rears is at maximum load.

Author:  TrustNo1 [ Tue May 15, 2018 8:09 pm ]
Post subject:  Re: Tyre pressures

ive always had 30 all round.

As for insurance for being invalid for incorrect pressure does anyone know anyone that had a claim refused for slightly incorrect pressure, the answer will be no as a claims assessors rarely check pressures unless they suspect the pressure is overly inflated or very flat then they would have to prove they were that pressure at the time of the incident.
Police do sometimes check pressures at an accident scene if it involves a life changing injury or death.
Most cars don't even get checked other than a repair value assessment.

(many years experience in the accident trade)

Author:  GTS290N [ Tue May 15, 2018 8:40 pm ]
Post subject:  Re: Tyre pressures

A couple of years back Falken recommended 26 all round on my 1850, 29 fully loaded, standard 4.5j dolly steel wheels.

Author:  trackerjack [ Thu May 17, 2018 7:57 am ]
Post subject:  Re: Tyre pressures

Yep I always used higher pressures similar to the folk on here.
On my kit cars however I use less because they weigh less.
Horses for courses old boy.

Author:  Carledo [ Thu May 17, 2018 12:50 pm ]
Post subject:  Re: Tyre pressures

Quote:
Yep I always used higher pressures similar to the folk on here.
On my kit cars however I use less because they weigh less.
Horses for courses old boy.
Exactly! On the lightweight (760kg) Carledo I run my 195/50/15s at 28 front and 24 rear dropping the rears to 12psi on the dragstrip.

But I expect to be running the considerably heavier (and softer sprung) Dolomega with it's 185/60/14s at about 30 all round.

You have to go with what works best for the car, not what someone said 40 years ago about a tyre that is no longer available! Tyre technology, like every other sort, has moved on and so should we!

Also, Justin has the right of it! An insurance assessor will not check tyre pressures during an inspection. The Police WILL, in the event of a fatality but only insofar as to make sure (as far as possible on a damaged car) that the tyres were at a reasonable pressure at the time if the incident. A few pounds here or there would not bring their wrath down on you!

Steve

Author:  Jod Clark [ Thu May 17, 2018 3:10 pm ]
Post subject:  Re: Tyre pressures

12psi front and rear on my Vindicator, because its near as dammit 100g per corner on Toyo T1Rs 195/50/15. i started out at 30psi all round and it handled like a very fast supermarket trolley

Author:  soe8m [ Thu May 17, 2018 8:13 pm ]
Post subject:  Re: Tyre pressures

On the volvo 165r15 2.5 bar at the front and 3 at the rear. Makes it slide better in corners. Dollies about 2 bar and the ones with 205/60/13 2.2-2.5.

Jeroen

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