Re:Tyre Pressure for 215/75/R15 ?

Hi All ,

There has been so many threads about tyres but not much about tyre pressure. If there is a thread that has this answer, please direct me to it.

I have recently bought some new steel wheels - 15x7" with 13 negative offset.



I am looking to add on them some BFG KO2 215/75/R15's but I don't know what PSI should I have.

Does anyone have a good idea on what tyre pressure would be best for :

• Touring/ Everyday - ___ ? (possibly 30 PSI
• Sand - 13-16 PSI
• Mud/Rock - 20-22 PSI

Any useful suggestions on what PSI I should be running on any scenario would be helpful!

Also , has anyone had any rub issues with such a large negative offset?

23 front , 26 rear

Drop 3 psi off-road if you want

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Negative 13 is barely anything. Standard is between 0 and negative 5 depending on which steels or alloys you have. Negative 32 is a fairly common size instead of using spacers and it's not usually a problem especially if you don't have front mud flaps.

I run KO2's in the same size. 24 psi all-round is where I am at.

I have tried a number of pressures and different front to back..... 24 psi works for me and my driving style. I drive fast B roads mainly and want a relatively stiff sidewall allowing fast changes in direction without the wallow caused by soft sidewalls.

I do plenty of off roading (rock, mud, sand) and have never had to lower pressures to get out of trouble. The day may come...... I would happily lower to 10psi if needed, the tyres would stay on the rims.

I run 30mm spacers and have no rubbing issues with a 45mm lift. There was no rubbing on standard wheels and standard suspension. Offset wheels and 215's on old tired suspension will rub on full lock, not much tho.

Cracking tyres in my humble opinion.

sniper

Thanks all for the advice , very useful.

I have the Gen 4 Jimny 2019 , would that make any difference in PSI ?

26 all round in Gen4

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As it's a gen4 the offset of the factory wheels is actually negative 22,( actually we now know that all 3 and 4 wheels are et5 and interchangeable) so with a negative 13 rim you're moving the wheel inboard 9mm which could be ok but might actually cause rubbing when at full steering lock or compression. Are you firm on having a complete second set of wheels and tyres because the 215s will fit the factory wheels and you would have one less complication.

I run 215/75 r15 BFG Muds.
I run them at 21psi on the road.
16-19psi off-road.
As low as 10psi on soft peaty ground or sand.

As a rule of thumb, the larger the volume of the tyre, the lower the pressure. Fitting bigger tyres and running them at higher pressures than standard is a recipe for a slipped disc!

Thanks everyone for replying.

Once I get the KO2's on the Gen 4 Jimny, I will play around with the tyre pressure.

I was thinking between 20-24 psi and looks like that is the what everyone is generally doing.

I have contacted BFG and waiting for their thoughts as well.

It is possible to calculate the exact number using the information on the sidewall of the tyre. It will state the maximum load the tyre can support at the maximum pressure it can contain. Therefore with the maximum axle weight of the car from the vin plate it is simply a matter of working that back into the pressure the tyre needs to support the load the car imposes.

I spoke with BFG directly and provided them with the Jimny 2019 Gen 4 PSI tyre pressure on the side of the door and they have provided me with this.





This is direct from the source. If you are running KO2 215/75/R15 on a Gen 4 Jimny

Does this account for the weight of the Jimny as in did you give them the axle weights as well as the inflation pressure of the standard tyres because those pressures seem a bit high for a tyre with a load index of 100? Not saying that it is wrong just seems a bit arbitrary.