Thread: 2014 Defender 110 - Tyre Pressures

Yes, pondering Bilbos point, be interesting to see if my MY15 110 with DSC has different tyre pressures, but I doubt it.

If you use the 4 psi rule, you can get the pressures that are appropriate for the load you are carrying and the speed at which you are driving.

I run 45psi all round on the road in my 110 Puma with 235/85r16 Goodyear Wrangler MTR's.
That's to compensate for front bar, winch, front and rear heavy gauge diff guards and heavy duty bash plate, and timber rear draw system.
All the extra weight of accessories needs to be taken in mind when talking tyre pressures.
I'm still "playing" with tyre pressures that suit me best in differing off-road conditions.

I have found the best tyre pressure gauge so far to be the ARB E-Z Tyre Deflator.
Its accuracy is spot in, and can obviously be used as a tyre gauge and deflator in one unit (as it states on the packet!)

Cheers,

So much depends on tyre size, type and construction, let alone weight/load and distribution.......

Case in point, I used to run 33psi on road (F&R) with 255/85 BFG KM Mt's.
Running Maxxis 762 Big Horns in the same size I need 38psi F&R with the same loads.

Purely gravel, 26psi all round, all on a 130 with a decent work load in the back seat and tray.

As for the speculation re under/oversteer and tyre pressures, I highly doubt it.
Deefers tend towards understeer when pushed anyway, but roll resistance, spring rates and CofG vary wildly from vehicle to vehicle depending on setup and will influence balance far more.

Originally Posted by BilboBoggles

I believe the reason for the lower front pressure on a defender is to induce understeer and avoid over-steer, I would guess it's an important handling characteristic on a defender in an emergency situation. I'd guess that a defender is more susceptible to flipping on it's side with oversteer. So you may want to avoid keeping them at exactly the same pressure front to back.

The effect of the pressure also varies across tyre brands.

My X-Tech defender has been through the dynamic test driven by me,I ran higher front pressure lower rear and it past the test,almost all the other vehicles were the opposite and all of them rolled to the point the drivers bailed and straightened up,all the vehicles except the Ambulances were unloaded. Pat

Originally Posted by AussieAub

I run 45psi all round on the road in my 110 Puma with 235/85r16 Goodyear Wrangler MTR's.
That's to compensate for front bar, winch, front and rear heavy gauge diff guards and heavy duty bash plate, and timber rear draw system.
All the extra weight of accessories needs to be taken in mind when talking tyre pressures.
I'm still "playing" with tyre pressures that suit me best in differing off-road conditions.

I have found the best tyre pressure gauge so far to be the ARB E-Z Tyre Deflator.
Its accuracy is spot in, and can obviously be used as a tyre gauge and deflator in one unit (as it states on the packet!)

Cheers,

You will have no grip and the tyres will howl running those pressures,the MTR is a rubbish tyre but try lower pressures,around 36 and below. Pat

Originally Posted by PAT303

You will have no grip and the tyres will howl running those pressures,the MTR is a rubbish tyre but try lower pressures,around 36 and below. Pat

Actually having them on my vehicle, and running as I've stated, I beg to differ.

I used to run oversized 235/85r16 Hankook RT/03's on my old V8 D2 at 55 PSI all round (65-70 PSI recommended by Hankook development team after a quick phone call). I got nearly 80,000km out of those before considering replacing, and those weren't noisy either....despite people telling me they would never last and the noise would be unbearable.

There's certainly no "howling" from the current MTR tyres at any speed I've done so far. It's very smooth and quiet.
And 36 and below is a shockingly low pressure to be running at with my set up, or any "mud designated" tyre at that.....I'll leave as is thanks.

Cheers,

How many K's have your MTR's done?,mine lasted 36,000k's running the recommended pressure.Don't know about the 70 psi on your D2,have fun with that on a corrigated track. Pat