Thread: Rims and Tyres

Has anybody 255/85/R16 on his Defender 130?
Do you need any modification or will they fit nicely.
Which brand did you choose?

Thanks for your info guys

Originally Posted by OZ Landy

Has anybody 255/85/R16 on his Defender 130?

Originally Posted by OZ Landy

Do you need any modification or will they fit nicely.
Which brand did you choose?

Thanks for your info guys

They should fit nicely on a 130, they have wider rims STD 6.5”

255's are not a very common size only a few companies make them

BFG, Maxxis and I think Cooper (**** anyway)


ben.....

Can you give me some info on the correction of the speedo? I think my speedo is reading about 9% too slow because when i am on the high way and sit at about 93km/h thats the speed every one else is going. At 100km/h i am over taking most peoples...

I have given up on speedos. I use the GPS for the true speed and here is why. I think speedos can only be 100% accurate for one moment of time on one day, because of tyre wear. Here is the math. My tyres are new and measure 805mm diameter. The tread is 10mm deep. If we compare the wheel revolutions for full tread and no tread this is what we get:







Diameter Pye Circumf Rotations/k 805 3.14 2530 395.26 785 3.14 2467 405.33



So you can see there is a potential difference of 10 revolutions per kilometre between new and worn tires...and that is about 25 metres extra to travel on the worn tyres. At least your acceleration will be better (marginally) on the worn tyres (as long as they dont slip!).

The spreadsheet copy did not come out formatted correctly so I will redo it here:

Tyre Diameter Pye Circumference Revolutions/km
805mm 3.14 2530mm 395
795mm 3.14 2467mm 405

I think I have the maths right, but I have made mistakes with the dreaded milimetre, centremetre, kilometre etc in the past!

Gday Teotwauki

Iam running a 285/75 16 just under a 33" tyre on a 16x8 zero offset rim with no problems yet .

If you want to see sum pics look here Mac familys new/old wagon/tourer Defender... Just fitted Dual Bat Uhf Compressor..

I used to run 33 x 12.5 x 15's on a ( i think a ) -20mm offset rim.. They stuck out about 2" past the gaurds..

They looked great and worked awesome offroad but have recently just gone back to a 16x7 rim with 255 85 16's bighorns.... It made it sooo much more drivable and didn't wander as much as the other tyres...

Originally Posted by Carslil Jim

The spreadsheet copy did not come out formatted correctly so I will redo it here:

Tyre Diameter Pye Circumference Revolutions/km
805mm 3.14 2530mm 395
795mm 3.14 2467mm 405

I think I have the maths right, but I have made mistakes with the dreaded milimetre, centremetre, kilometre etc in the past!

Without checking your maths, may I point out that the difference is about 2% - which is just a fraction more than the width of the speedo needle at 100kph - considerably less than the calibration error in my experience!

While on the subject, although not mentioned, I would point out that tyre pressure, for any reasonable pressure, does not make any difference - if you think about it for a moment, the apparent radius of the tyre changes, but the circumference of the tread does not - and that is what is laid down on the road every turn. regardless of the pressure (unless the pressure is high enough to stretch the belt or low enough to allow it to shrink - which with any realistic pressure is not going to happen!).

John