On my 2020 X2 XT-R with 27" GBC Dirt Commanders, I run them at 11 psi. I tried them at 9 or so, but it was too soft for hard pack and turns. My reservoir shocks are set at the softest slow and fast dampening settings too. I like a plush ride. LOL.

 

Thank you for the reply. For a reference point I am interested what Yamaha recommends for 27" tires.

 

I have a 2021 X2, I'm pretty sure Yamaha recommends 14-18 psi I brought mine down to 10 but might go up to 12

 

 

OEM recommendations will be for the OEM tire size and when you change that, you are on your own or the advice of the selling tire dealer and/or a tire manufacturer recommendation if you get such an offer. Loads vary as well as speeds per individual car and driver, which drives the pressure needed on a given tire. So you will probably get your best advice from owners on forums who have experience with the same tires and style of driving. The main caution I would offer is to be judicious in airing up a tire based on the maximum load, conditions and speed you plan on driving, and especially if it is on pavement. As with any size car, Auto or UTV, the big tire killer is heat on the roads. Not to mention sharp rocks and hidden cut roots in grass clumps.
And a 27" tire comes in anything from 4 ply to a 10 ply in radial and bias ply designs. What wheels? beadlocks or not? 12" or 14"? Swaybar connected? Any other speed mods? Until you answer those type questions I personally would not offer an opinion on pressure. I do respect the qualification that Planetcat gave to his response.

 

Thank you for the above post. Having ridden for 25 years over thousands of miles I agree with everything you are saying.
I am trying to get a starting point for the air pressure from a 2021 owners manual. I will adjust from there. With respect, I am not asking for an opinion just what the owners manual suggests.

 

Tire pressure sticker right below the drivers seat inside the cab. There are 2 recommendations based on vehicle load. If I recall...the lowest settings are 11 and 13 (front and rear) with the lightest load in the car. I could be wrong.
I'm assuming the engineers matched up the sticker to the stock GBC 27" dirt commanders that came on the car.
Anyway, that is what I am running right now. 11 front 13 rear. Everything still stock.

I will likely go down a couple lbs. from there depending on terrain, but I will likely never go up. I don't plan on hauling a bunch of heavy stuff.

I didn't cross check the owners manual. This is in my 2020 X2 XT-R...assuming the 21 model has the same sticker in the same place...

 

Thank you.