Thread: Mud terrain success!!!! 285/50 R20

Hello and excellent report...

Sorry to sadden you though... those wheels aren’t load rated to the Disco.... you can’t run RRS wheels on a D4...

If you are going to run that size tyre the HydroBushes and sidewall flex will likely see them rubbing everywhere from your photos... so continue to observe....

And you will need an emergency EAS kit - otherwise when it drops you will be stuck hard.

The taller rear bump-stops from MY12 on-wards stop most over-size tyres from wreaking the havoc they do on earlier D4s when air is lost.

Originally Posted by Graeme

The taller rear bump-stops from MY12 on-wards stop most over-size tyres from wreaking the havoc they do on earlier D4s when air is lost.

That’s interesting Graeme, I’ve been too chicken to drop mine to bump stops as a test. MY15 with 265/65/R18 Cooper STMaxx’s.

Thanks for the constructive criticism Tombie. Was not aware of the load ratings of the RRS though compared to the D4. SO from what I could tell gross vehicle axle load at the rear is 1855kg for a D4, which would make the wheels I have (900KG) just short. YOu know what, I can live with that. These wheels will prob be on the car 3 times max per year for weekend jaunts to the high country, and never at GVM. Yes not entirely legal....... .
The photos are the car on the bump stops (via the Gap tool) and I drove it on the bump stops to see where it was rubbing, which was the liner in the rear, slightly.Yes you will get a bit of flex from the bushes, sidewall but I can live with this. As I said those pics were at full articulation. As discussed I did run the 285/60 R18 at 799mm and now running the 285/50R20 at 793mm, so slightly smaller. I never really had a drama with the larger tyre, some paint missing on the chassis rails and some scuff marks on the liner.

I have been looking at the 18's as an option for the D4 but after Fraser Island, may go up to 20's. Reason? Well the sand that was stirred up when driving in ruts sat inside the rims and chewed the brakes out super fast.

Had a super loud horrible sound one from the front when driving to lake Mackenzie one day. Nursed it back to camp and had a mate bring some new pads over and did a swap on the island.

On inspection, the sand sitting in the brakes had got in, got hot and turned to glass inside the inner pads on both sides .

Hence I am thinking a 20 inch rim may give better free space for crap to fall out when driving.

I did 9500 Kms for the trip, up to the Cape and back via Fraser Island and have to say I have come away surprisingly impressed with the Hankooks. Kids asked me best part of the trip.....Not getting any punctures was one.

Will keep my eyes out for a nice black set of D4 rims

Originally Posted by Crofty

That’s interesting Graeme, I’ve been too chicken to drop mine to bump stops as a test. MY15 with 265/65/R18 Cooper STMaxx’s.

You may surprise yourself, I actually heated up the liner at the rear, folded a towel 4 times and placed it on top of the tyre where is was touching then dropped it down to the stops to press the liner in place. This was not exactly successful though as it split the liner! Will replace it when selling.

Originally Posted by Crofty

That’s interesting Graeme, I’ve been too chicken to drop mine to bump stops as a test. MY15 with 265/65/R18 Cooper STMaxx’s.

This was discovered after having fitted new MY12 shocks to my MY10.

Originally Posted by Wheelan

Thanks for the constructive criticism Tombie. Was not aware of the load ratings of the RRS though compared to the D4. SO from what I could tell gross vehicle axle load at the rear is 1855kg for a D4, which would make the wheels I have (900KG) just short. YOu know what, I can live with that. These wheels will prob be on the car 3 times max per year for weekend jaunts to the high country, and never at GVM. Yes not entirely legal....... .
The photos are the car on the bump stops (via the Gap tool) and I drove it on the bump stops to see where it was rubbing, which was the liner in the rear, slightly.Yes you will get a bit of flex from the bushes, sidewall but I can live with this. As I said those pics were at full articulation. As discussed I did run the 285/60 R18 at 799mm and now running the 285/50R20 at 793mm, so slightly smaller. I never really had a drama with the larger tyre, some paint missing on the chassis rails and some scuff marks on the liner.

FYI, I checked my wheel aligned report after noticing some scuffing on the chassis horn too (right side was rubbing not left), I stayed within the manufacturers specs and increased the castor (moved wheel forward), have never had a problem since. I now have zero rubbing up front with the 285 60 18s and only that spot at the rear where that tab is behind the guard that I was too lazy to bend back. Obvs need to have a wheel alignment machine to do this so not a diy job, but can be requested. . .

A lot of the techs won't adjust your castor to precisely where it needs to be as it doesn't affect tyre wear by being out a little bit and still within tolerance. Only problem is now the chassis horns turned orange from the lack of frequent polishing it was getting.