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Tyre pressure

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07 Mar 2014 18:46 #107587 by Casey
Tyre pressure was created by Casey
Hi

Just wondered if anyone can help me with a question about tyre pressure.

I recently changed my wheels and now have tyres sized 205/75/R15 instead of the original 205/70/R15. This might be a really stupid question, but do I still use the tyre pressure that appears on the label inside the driver's door, or do the new tyres need a new pressure?

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  • MWells
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07 Mar 2014 18:49 #107590 by MWells
Replied by MWells on topic Tyre pressure
I would use the same to start with and see how the ride is and adjust accordingly.

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07 Mar 2014 21:23 #107624 by gilburton
Replied by gilburton on topic Tyre pressure
It's such a small difference so stick to standard pressures.
I would get your speedo checked against a satnav just to see how much it has been affected though ;)

I started off high and worked my way down ever since :-)
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  • Leathery1
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07 Mar 2014 23:34 #107667 by Leathery1
Replied by Leathery1 on topic Tyre pressure
Speedo will still be running a bit low compared to satnav at 205/75s.
Ihave 215/75s and the speedo is now spot on with my satnav, and calibrated laser speed camera as used by local community speedwatch (dont ask, I just know, OK?)
Stick to same pressures unless tyre manufacturers say different. I have found best ride on BFG ATs is about 24 all round, but depends on suspension set up too

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08 Mar 2014 09:36 #107684 by gilburton
Replied by gilburton on topic Tyre pressure
That's why I recommended checking the speedo as your tyres are now about an inch larger in diameter so will affect the speedo and bring it nearer actual speed indicated.
Most speedos under read by about 2 mph and the change of tyre will take about 1 mph off of that so your margin of error going through a camera at say 50mph will be reduced.

I started off high and worked my way down ever since :-)
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  • rogerzilla
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08 Mar 2014 22:33 #107806 by rogerzilla
Replied by rogerzilla on topic Tyre pressure
For road-only use some people put a bit more air in (say 2-3 psi extra front and back) as this can improve economy without significantly affecting ride or ultimate grip. On most cars it increases cornering power too, but this isn't something you really want on a Jimny...you'd prefer a drift to a rollover :side:

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09 Mar 2014 09:35 #107850 by zerez
Replied by zerez on topic Tyre pressure
The width 205/75/15 and the 205/70/15, so I would think that for on-road travel you need to keep the pressure as recommend by Suzuki.

For offloading I would use 16-17 PSI (with the 205/70/15 I am using 20 PSI).

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