Largest tyre sizes on a standard ratio driveline?

**twr7cx** · 26th February 2013, 07:08 PM

What is the largest tyre size that anyone has run on the standard ratio driveline of their D2?

I am currently running 255/70R18 which are 32.05" or 814.07mm. Personally, I prefer the vehicle like this. The revs are lower on the highway (and the torque converter still locks up at highway speeds), and with the VNT and exhaust modifications it is still fast enough without any negative effects on the fuel economy.

**gavinwibrow** · 26th February 2013, 07:13 PM

Don't you also have a 2" lift?

**twr7cx** · 26th February 2013, 07:27 PM

Originally Posted by gavinwibrow

Don't you also have a 2" lift?

3". I have a 2" suspension spring lift and 1" suspension spacer lift based on the Les Richmond White Tiger kit.

But my question for this thread does not relate to rubbing. It relates to the vehicles driveline ratio/gearing. The larger the tyre, the more it slows the vehicle down, meaning you have to work the engine harder to move and probably also stresses the driveline more. I'm curious as to how far others have gone while retaining the standard driveline ratios.

**walker** · 26th February 2013, 07:27 PM

On my last D2 I ran 32" everyday but then ran 34" simex's offroad. Standard axles but with ARB lockers. The 34's were ok, but it did mess up the auto gearing.

This time round I am running 33" as everyday tyre but with 4.12 ratio diffs.

**twr7cx** · 26th February 2013, 07:29 PM

Originally Posted by walker

This time round I am running 33" as everyday tyre but with 4.12 ratio diffs.

What do you think 33" would be like every day? I am looking at fitting some 285/75R16 which are around there. Considering I have been running and am used to 32", I'm hoping the further 1" increase may not be too bad?

**bob10** · 26th February 2013, 08:16 PM

Been doing a bit of research into this topic, as I will be buying new tyres in about 18 months. The advice given to me was, from tyre dealers almost to a man, was, if you are travelling in remote areas, the most common sizes are - 265x 70, 245 x 70 [ because most Toyotas & nissans run those sizes]almost any other size , if you have a problem in a remote area, cold see you waiting for delivery, at a very high price. According to them. Bob

**walker** · 26th February 2013, 08:28 PM

They are running 265/70 but on a 17" rim

The 285/75-16 is a very very common tyre out there. I would not run that size without altering the diff ratio's. The Disco will handle it but fuel economy goes up and performance goes down. The auto tends to hunt as well

**Slunnie** · 26th February 2013, 08:33 PM

Originally Posted by twr7cx

What do you think 33" would be like every day? I am looking at fitting some 285/75R16 which are around there. Considering I have been running and am used to 32", I'm hoping the further 1" increase may not be too bad?

I ran like that for quite a while. It's fine with the TD5 auto at least. Used a bit more around town and a bit less on the hwy, but fuel economy was inconsistent.

**walker** · 26th February 2013, 08:49 PM

Originally Posted by Slunnie

I ran like that for quite a while. It's fine with the TD5 auto at least. Used a bit more around town and a bit less on the hwy, but fuel economy was inconsistent.

I knew you would be on here contradicting me Slunman!

We have always had different ideas about what size tyres run nicely. But that could be to do with the difference between TD5 and V8. I just think 33's are too much for the V8 on stock diffs.

**brenno** · 26th February 2013, 09:04 PM

I'm running 33" (285/75R16) BFG KM2's on standard gearing.

Probably a little sluggish off the line, but I don't race it.

Let's face it, it's still quicker than a TD5

I'll go to 4.12's (or 4.37's if I go to 35's) one day.

Thread: Largest tyre sizes on a standard ratio driveline?

Thread Tools

Largest tyre sizes on a standard ratio driveline?

Bookmarks

Bookmarks

Posting Permissions