Tyre Pressures-Chalk Test

The Mad Hat Man · Oct 20, 2012

The Mad Hat Man said:
do the chalk test.

blow them up to a nominal value,
rub a line of chalk across the tyre,
drive a couple of hundred yards in the dry,
look at chalk mark,
if centre of chalk mark is worn off, decrease pressure,
if outside of chalk mark is worn off, increase pressure,
repeat until all of chalk is worn off uniformly,

tyre pressure is ideal for your motor, loaded as per test.

easye1 · Jan 17, 2015

read this through a few times then thought about it...

it`ll work just fine on new tyres, but wont if you use preworn tyres, as they too may have un normal tyre wear for your chalk test - perhaps..

Superted87 · Mar 10, 2015

Remember chaps, this does not work on a chalk surfaced road !

easye1 · Apr 30, 2015

good god, how would this work then on chalk roads of dover, or, or , or maybe....

300bhp/ton · Jul 21, 2015

Also depends on what use you are using the vehicle for. Towing you'll probably want slightly over inflated, off road under inflated. And tyre type, side wall height, ply thickness. Suspension geometry will also affect this, as the chalk test assume the tires is completely vertical with 0 toe in/out, no caster and 0 camber.

norseman · Jul 22, 2015

Sounds like someone is trying to re-invent the wheel (no pun intended)
Over the last five decades I have realised decent mileage averages on tyres just by sticking to the manuf. stated settings, without faffing about with bits of chalk.

flyingbanana · Sep 16, 2015

So are we any closer to what pressure ?
As its raining I can't try this
Some one must have these and must know
Andy

wooly123 · Nov 7, 2015

flyingbanana said:
So are we any closer to what pressure ?
As its raining I can't try this
Some one must have these and must know
Andy

use waterproof chalk ?

Coffeelandy · Nov 17, 2015

Tipex?

freelance · Nov 17, 2015

Mistake! Sorry, thought I was on word association thread.

mik · Mar 18, 2016

The Mad Hat Man said:
blow them up to a nominal value,
rub a line of chalk across the tyre,
drive a couple of hundred yards in the dry,
look at chalk mark,
if centre of chalk mark is worn off, decrease pressure,
if outside of chalk mark is worn off, increase pressure,
repeat until all of chalk is worn off uniformly,

tyre pressure is ideal for you motor, loaded as per test.

Sheesh!....this is about one of the best ways of spotting a deflated or over inflated tyre! This I must try as looking at other threads tyre pressures thet range from 24 to 32 bar!!!! Thanks tmhm!

MULDERKE · Jul 29, 2016

Ok Pals.
Getting some dry weather would be a start. Until then I'll stick at 32 lbs and see how we go.
Must say though, can really feel the difference with these tyres on compared to my old set. Now, they were road tyres and yet the new set has better road grip.
I'll see how they fare off road in a week or so.My hobby takes me off road (shale, small rocks & mud) every other weekend, so well see how we go.
Cheers ALL.

Oldseadog · Aug 5, 2016

28 psi in the front and 32 psi in the rear for normal road driving

Off road 16psi all round, but remember to pump them up after your play!

LordOWar · Aug 6, 2016

mik said:
Sheesh!....this is about one of the best ways of spotting a deflated or over inflated tyre! This I must try as looking at other threads tyre pressures thet range from 24 to 32 bar!!!! Thanks tmhm![/QUOTE

I hope that's ment to be psi because 32 bar is a bit high.

EvanCooper39 · Jan 27, 2018

I usually just go with the manufacturer's recommendation. I'm too lazy to play around with chalk. Did you make a hop-scotch on your tyres?

Turboman · Jan 27, 2018

EvanCooper39 said:
I usually just go with the manufacturer's recommendation. I'm too lazy to play around with chalk. Did you make a hop-scotch on your tyres?

Recommendation doesn't take into account actual loading. Which may vary widely.
We used a version of the chalk test to inflate tractor tyres, although we didn't actually use chalk. We just parked the tractor on a concrete floor, and then inflated until the lugs were flat on the floor across the bottom.
The actual pressures would be quite different if you had an implement or lift box on the arms, or unladen.

kevstar · Jan 27, 2018

mik said:
Sheesh!....this is about one of the best ways of spotting a deflated or over inflated tyre! This I must try as looking at other threads tyre pressures thet range from 24 to 32 bar!!!! Thanks tmhm!

Have you've been sniffing the chalk lol good luck getting 24 bar into a tyre

dieseldog69 · Jan 31, 2018

mik said:
Sheesh!....this is about one of the best ways of spotting a deflated or over inflated tyre! This I must try as looking at other threads tyre pressures thet range from 24 to 32 bar!!!! Thanks tmhm!

24 bar

That's as near as dammit 350psi

Rank Amatuer · May 9, 2018

I once got a company 4x4 back from the garage with 80psi in the tyres. “That’s what’s written on the sidewall.” Said the ‘mechanic’. It made the vehicle a bit bouncy and directionally unstable.
Mind you, this was in Australia, perhaps they do things differently there.

saxavordian · May 11, 2018

Question are all standard tyres manufactured to the same size and thickness going from expensive to cheaper end. So if my Freelander 1 2002 says 195 - 65 - R16 all other tyre makers have the same moulded thickness when new.

Tyre Pressures-Chalk Test

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