Tire pressure for Yokohama G003 tyres on 15" wheels

Caledonian

Caledonian

TJ Enthusiast
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I have a frustrating 2 months waiting for my 2004 TJ 40 auto (Japanese spec) coming from the Land of the Rising Sun..

So while I wait I'm an arm chair theorist.

The 40 Sport is fitted with what appears to be 15" alloys with Yokohama Geolander G003 tyres.

Questions
  1. What tyre pressures would you use for highway use including upto say 70mph
  2. What tyres pressures would you use for forest tracks ideally
  3. Ditto for mud plugging
  4. Any difference for snow and ice?
  5. The rear tyre / wheel is different..my understanding that a matching wheel/tyre is required if you have a Dana 44 with factory LSD fitted?
  6. Can anyone identify the make of the alloy wheel?
Cheers!

0803424A30200911W00111.jpg


0803424A30200911W00112.jpg
 
Caledonian said:
I have a frustrating 2 months waiting for my 2004 TJ 40 auto (Japanese spec) coming from the Land of the Rising Sun..

So while I wait I'm an arm chair theorist.

The 40 Sport is fitted with what appears to be 15" alloys with Yokohama Geolander G003 tyres.

Questions
  1. What tyre pressures would you use for highway use including upto say 70mph
  2. What tyres pressures would you use for forest tracks ideally
  3. Ditto for mud plugging
  4. Any difference for snow and ice?
  5. The rear tyre / wheel is different..my understanding that a matching wheel/tyre is required if you have a Dana 44 with factory LSD fitted?
  6. Can anyone identify the make of the alloy wheel?
Cheers!

View attachment 220310

View attachment 220311
Click to expand...
What size tire are the Yokahoma Geolander’s?

Don’t know the wheels. Some Soft 8 with a decorative edge. Search for “soft 8’s”
 
JMT said:
What size tire are the Yokahoma Geolander’s?

Don’t know the wheels. Some Soft 8 with a decorative edge. Search for “soft 8’s”
Click to expand...
Information apart from what can be gleaned from the pictures is scant..looking at possible sizes in production my best guess is

30X9.50R15 maybe 31X10.50R15 ?

Yokohama only publish a maximum presssure of 50 PSI..
 
They look like a 31x10.5r15. If so, 28psi. You can air down if you have snow for long periods of time and improve traction, 8-10psi. For mud and normal offroad, 10-12psi. Your spare should be within one tire size of whatever size the Yokohama is. It doesn’t have to be the same wheel/tyre.
 
JMT said:
They look like a 31x10.5r15. If so, 28psi. You can air down if you have snow for long periods of time and improve traction, 8-10psi. For mud and normal offroad, 10-12psi. Your spare should be within one tire size of whatever size the Yokohama is. It doesn’t have to be the same wheel/tyre.
Click to expand...
Hello Yokohama does do a 31 x 10.5 R15 too..thx
 
True pressure start out at around 30 psi. Drop by 2 psi until you hit what the tires want. You will know. The tires will suddenly track beautifully and give a nice soft (Jeep soft) ride. Probably be around 26 psi.
As for off road pressure, stick with normal psi unless you are driving on rocky surfaces that could cut the tire. For normal forest trails, light mud, etc. just keep normal pressure unless you are going fast enough to want a lower pressure to give a bit softer ride inside. And then drop to 20 or so psi. Again, if you aren't experiencing traction loss there is no real need to drop the air in the tires, exception being sharp or jagged rocks that could cut the tires. Then to around 12-15 psi. Or big rocks where soft tires needed to mould around and grip the rocks. Again, 12-15 psi.
No real need to fuss with the tires unless traction is being lost and this is unlikely during normal trail driving. There is no harm in dropping down to 12-15 if you want to, just will be waiting to air down and again air up at the end of the trail. Find a group of Jeepers in your area and try to hang out with them and learn from them what is best. Local information is normally the best information.
Jeeps are extremely capable offroad with little more than good tires. Try and ride along with a few guys (most are more than happy to if they have room) on different trails and you will start to pick up tips to make trails easier and picking the best line to drive over obstacles.

Welcome to the Jeep World! 🥳Tons of info on this forum you can read through and we are glad to help with any questions. 🍻🍻
 
Goatman said:
True pressure start out at around 30 psi. Drop by 2 psi until you hit what the tires want. You will know. The tires will suddenly track beautifully and give a nice soft (Jeep soft) ride. Probably be around 26 psi.
As for off road pressure, stick with normal psi unless you are driving on rocky surfaces that could cut the tire. For normal forest trails, light mud, etc. just keep normal pressure unless you are going fast enough to want a lower pressure to give a bit softer ride inside. And then drop to 20 or so psi. Again, if you aren't experiencing traction loss there is no real need to drop the air in the tires, exception being sharp or jagged rocks that could cut the tires. Then to around 12-15 psi. Or big rocks where soft tires needed to mould around and grip the rocks. Again, 12-15 psi.
No real need to fuss with the tires unless traction is being lost and this is unlikely during normal trail driving. There is no harm in dropping down to 12-15 if you want to, just will be waiting to air down and again air up at the end of the trail. Find a group of Jeepers in your area and try to hang out with them and learn from them what is best. Local information is normally the best information.
Jeeps are extremely capable offroad with little more than good tires. Try and ride along with a few guys (most are more than happy to if they have room) on different trails and you will start to pick up tips to make trails easier and picking the best line to drive over obstacles.

Welcome to the Jeep World! 🥳Tons of info on this forum you can read through and we are glad to help with any questions. 🍻🍻
Click to expand...
Your advice is much appreciated ...at the very least it’s a good baseline to start from 👍
 
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