Thread: Wrangler MTR 19's

Originally Posted by BlackPerth

Gents, what are recommended off road tyre pressures for MTR's (Wrangler) on 19 inch rims? More in relation to stony rough gravel roads / mud n ruts than say sand - but interested in all comments.

Hey BlackPerth,

I have had my D4 for about 6 mths and am really only trying to get a grip (pardon the pun) on what my tyres are and can/cannot do.

I have stock Goodyear Wrangler 19" tyres that state M+S All Weather....which I've read means Mud & Snow......but I dunno.

MTR...supposedly meaning Maximum Traction Reinforced...where does it say that on the tyre?.....how do you know? Are we talking about the same tyre?

Anyway....on my tyres.....did a heavily loaded trip to a campsite with the recommended pressures...36 & 42psi. Left them that way all weekend on heavy gravel and limited surface mud. No issue what so ever. The D4 was very sure-footed and suffered no tears, scallops or any damage at all. Repeated the same a few weeks later in even more trying conditions...gravel, rocks and wash-outs...same result.

Cheers,

Kev.

My experience on rocky tracks etc is 25lb minimum.
I have been lower than that twice & experienced problems both times.

Regards

Chuck

If it's a dirt road where you'd do 70-80 then 30psi. Otherwise go as low as 25 for low range work, lower if you're careful. Sand another story though, start at 20 and lower from there.

Thanks guys, mine are the very agressive mud terrain 19inch off road tyres (not the standard 19inch Wrangler). I bought them with 5 second hand RRS wheels as a second set for the forthcoming D4 (arrives Oct). I'm curious what LR recommend for tyre pressures (PSI) for these tyres as they used them extensivley on the G4 Challenge.

Given Land Rover decided it was a good idea to run a Freelander with 235/65/17s at 25psi in very soft duney sand I'm not sure I'd put a lot of faith in their recommendations, but each to their own!

I also seem to recall they don't air down in rocky terrain, citing sidewall concerns.

Chris,

I've a self-made booklet I keep in the glove box which talks about suggested settings. I will e-mail you a copy when I get sorted. One of the settings is tyre pressures. For the MTRs, I use the following:
Driving Type Front Rear (psi)
Highway light 35 38
Highway hvy 40 46
Gravel 30 30-33 (depending on load, trailer)
Rock/Hard Sand 22-28 24-32 (max 60 km/hr)
Soft Sand 16-20 16-20 (max 50 km/hr)

These are "cold" pressures I use, not "actual" (can increase by 4psi when driving from cold start). On rock, if they're jagged, use the higher settings and drive carefully to prevent impacting and cracking one of those beautiful rims. This is the unavoidable downside of low profile 19" rims.

Cheers,

I have the MTR's and done a 17k on them now.

Did the powerlines today, full of mud and rocks and left them at 36psi. I dont see the point of lowing them and they work a treat as is.

On sand however i drop them to 18psi and that works well

Dorko