Go skinny my friend. A wide tyre like a 12.50 will be of no real benefit on the trail with a full bodied Disco.
Even 35" is a bit too tall for these trucks but that depends a lot on what you do to fit them. You don't want to lift it sky high so cutting body panels and running a wheel or spacer that pushes the tyre out from the chassis can help a with that..
it is not too tall for these trucks at all. you just need to know how to put them on the "right" way, which is keeping COG low, trimming the fenders, and running the correct axle shafts, gearing, and lockers. there is a list to be done, but 35s are not too big at ALL.
A 33x10 is a good size for your disco. Anything bigger than that and you will begin to seriously compromise stability, maneuverability, performance and durability for very little gain. In racing it is called the law of diminishing returns.
bullshit, again. you won't compromise stability at all with a 3" lift and 35s. you're going to need to push the tires out, yes, so either spacers, or a wheel with at least an offset or 4.75 or less is in order. once you hit 35s, the trail possibilities grow ten fold. you can go so much further with lockers and 35s than you will with 33s.
Everyone makes a big deal about ground clearance and wants to fit the largest tyres they can in an effort to gain a 1" or 2" but how useful will that be to you, how often do you think you will really need it and what will you sacrifice to get it.
it's the difference between getting over that rock or not. crawlers try to gain every single inch they gain while keeping the rig balanced. ever hear of dana 60 swaps? the diff on a D60 hangs down pretty low, making it an anchor in the rocks. however, it's one of the most bullitproof axles out there, so do you know what they do? they shave 1"-2" off the pumpkin just to gain those few inches. it really comes in handy. and extra inch or two of unsprung ground clearance can mean getting over something or not.
First be realistic. A Discovery is a big heavy SUV with a large rear overhang. On the trial or in the rocks maneuverability is far more useful than big tyres. Unless you want to go for a balls out full time dedicated trail rig and bob tail your Disco the extra width and height will be of little use in the real world.
so are land cruiser 80 series, but people take those things absolutely EVERYWHERE. all the issues you mention can be gotten around with good driving and the right protection.
The few situations that you will likely encounter where a 35x12.50 would be advantageous over a 33x10 can usually be overcome by a combination of driver skill, experience and maneuverability. Remember that traction is more often the deciding factor in a loss of progression, not tire size.
how do you know if he will encounter them or not? all the good, difficult trails around me REQUIRE 35s, at least one locker and a winch. so you have no idea what trails he will be running.
Fitting a locker is actually easier on axle components as it reduces shock loads.
Hope this helps.
not when your axles are made of swiss cheese like rovers. a rover axle is going to have a hell of a hard time holding up to 35s and a locker on multiple trail rides, especially if his driving style is throttle happy.
Obviously running a tire that size would be counter-productive if they hit the firewall, or I can't turn the front's when they're stuft. That's why I'm thinking a narrower tire would be better.
here are some examples of discos and other LR that are the same chassis (same design and components anyways) for you to see. 35s will fit without hitting the fire wall, but some fender trimming is necessary:
35" KM2s. 3" lift and some trimming:
35s. 3" lift. then he got 37s on the same lift a little bit down. it's more modified now and a trail rig "truggy" only. those photos are at the end:
what were you saying about stability? looks stable to me.
he winched out, and didn't flip. who would've guessed?