URGENT 31 inch tyres on standard 300 tdi gearing

[ROAMER_AUS]

Hi all,

31 inchers on manual 300 tdi disco1?


Does anyone have this setup and how do you find it fuel consumption and acceleation wise?

31 inch doesn't seem much bigger than standard 245/75.

Need the info urgently!

Thanx!

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[edddo]

what car?
I run 31s on a disco 1. 245/75 is close enough to 31 so no real difference.

[Dougal]

Standard is 235/70r16.

[ROAMER_AUS]

It's a 96 disco1 300tdi manual. I bought mine with 245/75 so i taught that was standard.

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[Spel1]

I run 31x10.5 15s on the 300tdi auto- no issues and the closest the speedo has been to accurate at 100kmh. 245/75 16 is my next choice and as mentioned are about the same. Only that the 15s are way less expensive for my tyre choices.

[ROAMER_AUS]

What about clearance? Did you have to do the camelback cuts at the rear?

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[edddo]

Yes I needed the rear camel cut for the 31s. Can also hit the top of wheel arch on full compression when cross axelling with a bit of momentum..noticed this on recent simpson crossing. Otherwise I had not noticed this in 6+ years of driving with this tyre size.

[DiscoMick]

I went from the standard 235/70/16 to 245/75/16 in our auto 300Tdi and didn't notice much difference except the speedo is slightly closer to accurate now, according to the GPS. Didn't have to cut the rear but they did rub a bit on full lock and the lock needed adjustment.
Next time I would go 245/70/16 as I was told that doesn't cause the rubbing on full lock.

[ROAMER_AUS]

Looks like my disco already has some lift. So I might get away with it. Tests soon to come!!!

[Dougal]

Looks like my disco already has some lift. So I might get away with it. Tests soon to come!!!

A lift doesn't stop rubbing, it simply delays it until you're actually stuck.
Then the body grabs a tyre and you're really stuck.;)

[loanrangie]

You will need to do the camel trim at least as they will hit the guards when the rear articulates even with a lift.

[Dougal]

My 215/85R16's and 255/65R16's don't hit the guards on the back. I'm surprised the 245/75's do.

[DiscoMick]

I have a 50mm lift and my 245/75/16s don't hit the guards.

[ROAMER_AUS]

To me it seems that it won't rub neither. I'll have to do some exact measurements. But yes you are all right, lift doesn't stop rubbing.

[discoverybob]

do a search on Bridgestone tyre site. It lists most tyre sizes with all the info you need to find the answer to your question.:cool:

[THE BOOGER]

I have 265,s the front rub on full lock and needed a fair bit cut off the rear guard speedo is slightly under about 2 k at 100 with fuel pump tweaked no problems accelerating it was a little sluggish at first

[Dougal]

I have 265,s the front rub on full lock and needed a fair bit cut off the rear guard speedo is slightly under about 2 k at 100 with fuel pump tweaked no problems accelerating it was a little sluggish at first

But what height 265's?

[THE BOOGER]

But what height 265's?

265 75 16
about 32.156 according to the exploreoz trye calculator:)

[loanrangie]

The camel cut is to prevent the tyres hitting the rear of the rear guard, tyre height is another matter.
I'm also running 265/75's but with a 3" lift so i dont hit any guards just the radius arms.

[Dougal]

The camel cut is to prevent the tyres hitting the rear of the rear guard, tyre height is another matter.
I'm also running 265/75's but with a 3" lift so i dont hit any guards just the radius arms.

Whether you need the cut depends on width and height.
My 215/85 tyres fit inside the guards and don't need the trim despite being almost 32 inch.

Did you pack the bump stops down 3 inches to create clearance? A lift alone doesn't help.

[loanrangie]

Whether you need the cut depends on width and height.
My 215/85 tyres fit inside the guards and don't need the trim despite being almost 32 inch.

Did you pack the bump stops down 3 inches to create clearance? A lift alone doesn't help.

215 is a narrow tyre so wont go anywhere near the guards, anything over the stock 235 is at risk of clipping the guard, the height will only make them rub the inner guard.

No bump stop packers but tall springs do reduce the travel, more coils equals more metal. Still likely to hit inner guards but much reduced due the the Koni's i fitted.

[Dougal]

215 is a narrow tyre so wont go anywhere near the guards, anything over the stock 235 is at risk of clipping the guard, the height will only make them rub the inner guard.

My 255/65R16's don't rub the rear guards either. But because they are low enough.


No bump stop packers but tall springs do reduce the travel, more coils equals more metal. Still likely to hit inner guards but much reduced due the the Koni's i fitted.

Please tell me you're not using spring bind to limit travel!:o

[Bushy049]

Iv been running 31 inch tyres for a couple of years now on my Tdi auto, using a 2 inch lift and the camel cut. One of the most important things is getting15. Inch rims with the right offset I bought 2 sets before getting it right. It has knocked off a bit of performance on the hills but the performance off road more than makes up for it.

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[Dougal]

Iv been running 31 inch tyres for a couple of years now on my Tdi auto, using a 2 inch lift and the camel cut. One of the most important things is getting15. Inch rims with the right offset I bought 2 sets before getting it right. It has knocked off a bit of performance on the hills but the performance off road more than makes up for it.

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Generally 31" tyres available for 15" rims are wider than 31" available for 16" rims. If you're using less offset to keep turning circle without rubbing on the radius arms then you'll be poking into the guards even further.

[DiscoMick]

I probably should have said my comments about my 245/75/16s not rubbing with the 50mm lift and adjusted steering lock were with them being on LR steel wheels identical to the factory steel spare. Not sure if that makes any difference to you.

[ROAMER_AUS]

Got the 31s. Tyre size is not the problem. It's the offset in the rims as someone mentioned before. They stick too much out!!!!

[beagleONE]

Iv been running 31 inch tyres for a couple of years now on my Tdi auto, using a 2 inch lift and the camel cut. One of the most important things is getting15. Inch rims with the right offset I bought 2 sets before getting it right. It has knocked off a bit of performance on the hills but the performance off road more than makes up for it.

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What size and offset are you using mate, Im assuming a 15x8 +/-??


Thanks mate

[Bushy049]

15/7 inch the first ones I brought were 15/8 and stuck out way to far iv looked for the paperwork for them and can't find it I'm pretty sure there a -25 offset, if you put a straight edge on the outside of the rim it is about 75mm to the flat in the center of the rim. As you can see from the attached photos they are a very neat fit and don't need flairs, and don't rub on full lock

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[Dougal]

15/7 inch the first ones I brought were 15/8 and stuck out way to far iv looked for the paperwork for them and can't find it I'm pretty sure there a +25 offset, if you put a straight edge on the outside of the rim it is about 75mm to the flat in the center of the rim. As you can see from the attached photos they are a very neat fit and don't need flairs, and don't rub on full lock

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When stock they articulate the rear suspension enough to tuck a wheel up in the guards. Looks like you can't do that with those tyres.

[Bushy049]

found the paper work for them -25 offset 15/7" dynamic rims, I have had trouble finding somone who could balance them due to the massive hole in the middle of the rim, I have to go to the next town to a guy has a machine for balancing tyres on coaster busses and small trucks

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[Bushy049]

When stock they articulate the rear suspension enough to tuck a wheel up in the guards. Looks like you can't do that with those tyres.

They tuck into the guards at full flex but I will be honest only just, but iv never had them rub and my disco sees plenty of action

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[Bushy049]

I did at one point decided that I was old enough to fit all terrain tyres and without the side wall lugs there was more clearance inside the guard. Then shortly after that I nearly got bogged checking my yabby nets one night and decided never to old for muddys

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