TIRE PRESSURE
Thread Starter
Newbie
Joined: Oct 2020
Posts: 2
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GLE 350d
TIRE PRESSURE
Hi to everybody,
I've looked for this information but didn't find it.
On my car I've 22" Wheels and in the fuel flap I read normal condition pressure is 2.0 bar (29 PSI) front and rear.. Full load 2,?? - 2,9..
In my experience 2.0 is very low. What do You think about it?
Ps. For Winter tires I've bought 20"x9,5 wheels with 275/45...
I use 2,5 bar for both.. What do You think about it?
Thanks a lot.
I've looked for this information but didn't find it.
On my car I've 22" Wheels and in the fuel flap I read normal condition pressure is 2.0 bar (29 PSI) front and rear.. Full load 2,?? - 2,9..
In my experience 2.0 is very low. What do You think about it?
Ps. For Winter tires I've bought 20"x9,5 wheels with 275/45...
I use 2,5 bar for both.. What do You think about it?
Thanks a lot.
MBWorld Fanatic!
Joined: Jul 2003
Posts: 6,771
Likes: 1,265
From: Lake Oswego, OR
2020 GLE 450; 2023 BMW M2 Coupe
Tire pressure
Hi to everybody,
I've looked for this information but didn't find it.
On my car I've 22" Wheels and in the fuel flap I read normal condition pressure is 2.0 bar (29 PSI) front and rear.. Full load 2,?? - 2,9..
In my experience 2.0 is very low. What do You think about it?
Ps. For Winter tires I've bought 20"x9,5 wheels with 275/45...
I use 2,5 bar for both.. What do You think about it?
I've looked for this information but didn't find it.
On my car I've 22" Wheels and in the fuel flap I read normal condition pressure is 2.0 bar (29 PSI) front and rear.. Full load 2,?? - 2,9..
In my experience 2.0 is very low. What do You think about it?
Ps. For Winter tires I've bought 20"x9,5 wheels with 275/45...
I use 2,5 bar for both.. What do You think about it?
Member
Joined: Oct 2009
Posts: 78
Likes: 15
Seat Alhambra
Tirepressure is all about real load on tire, and maximum speed used( and wont go over for even a minute).
maximum load of a cartire is calculated for the reference-speed of 160kmph/99mph.
and for the reference-pressure of standard load 2.5bar/36 psi.
then there is an official system for higher speed and lower load then maxload, to determine the needed pressure.
its all to prevent the tire from overheating when driving the speed for wich it is calculated.
If now max speed is not high, and maxload of tire is with ilarge reserve, a low pressure is yustified. Will still give no overheating.
most likely the MB has tires, that have a large reserve, so the 2bar/29 psi is completely safe.
If you can produce the real axleweights( frobt and rear different) and your max speed, together with the tire-specification, I am able to calculate a safe highest pressure, with still acceptable comfort and gripp.
determining the weights on axles, bes axle-ends, is the most tricky part in it all.
maximum load of a cartire is calculated for the reference-speed of 160kmph/99mph.
and for the reference-pressure of standard load 2.5bar/36 psi.
then there is an official system for higher speed and lower load then maxload, to determine the needed pressure.
its all to prevent the tire from overheating when driving the speed for wich it is calculated.
If now max speed is not high, and maxload of tire is with ilarge reserve, a low pressure is yustified. Will still give no overheating.
most likely the MB has tires, that have a large reserve, so the 2bar/29 psi is completely safe.
If you can produce the real axleweights( frobt and rear different) and your max speed, together with the tire-specification, I am able to calculate a safe highest pressure, with still acceptable comfort and gripp.
determining the weights on axles, bes axle-ends, is the most tricky part in it all.
Last edited by jadatis; Oct 29, 2020 at 04:02 PM.
Thread Starter
Newbie
Joined: Oct 2020
Posts: 2
Likes: 0
GLE 350d
Thanks a lot for the "very technical reply"!!
I use 2.5 on my experience.... But if You have this knowledge I trust in You...
Normally I drive at 140 Kmh sometimes 170 for few minutes and sometime over 200 but for short time.
Normal load is 2-3 persons....
Car Weight is a normal GLE 350d whith 22" 325/285 in summer and 20" all 275 in winter...
I use 2.5 on my experience.... But if You have this knowledge I trust in You...
Normally I drive at 140 Kmh sometimes 170 for few minutes and sometime over 200 but for short time.
Normal load is 2-3 persons....
Car Weight is a normal GLE 350d whith 22" 325/285 in summer and 20" all 275 in winter...
Member
Joined: Oct 2009
Posts: 78
Likes: 15
Seat Alhambra
Thanks a lot for the "very technical reply"!!
I use 2.5 on my experience.... But if You have this knowledge I trust in You...
Normally I drive at 140 Kmh sometimes 170 for few minutes and sometime over 200 but for short time.
Normal load is 2-3 persons....
Car Weight is a normal GLE 350d whith 22" 325/285 in summer and 20" all 275 in winter...
I use 2.5 on my experience.... But if You have this knowledge I trust in You...
Normally I drive at 140 Kmh sometimes 170 for few minutes and sometime over 200 but for short time.
Normal load is 2-3 persons....
Car Weight is a normal GLE 350d whith 22" 325/285 in summer and 20" all 275 in winter...
but I am not an MB driver, so cant produce Max permissable axleweights , sou have to give them.
also the tires 275/ ?? R 20 and if XL or standard load.
Also for the summer tyres, and different front and back .
MBWorld Fanatic!
Joined: Jul 2003
Posts: 6,771
Likes: 1,265
From: Lake Oswego, OR
2020 GLE 450; 2023 BMW M2 Coupe
You can be sure Mercedes' recommended tire pressures have been tested and are conservative for all normal conditions, including maximum speed.
