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peterl

Member Since: 08 Jan 2009
Location: Pembrokeshire
Posts: 307

Tyre sizes

Just a quick question to those who know, do 235 x 85 x 16 and 265 x 75 x 16's have the same rolling circumference? Can I run them together and not damage the transfer box?

11th Apr 2010 12:53pm

roel

Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

They are almost the same diameter according to my calculation ie 238 x 85% and 265 x 75%. There are differences however between manufactures too.
Personally I think you will be save but I am not an expert.
If your front tyres or rear tyres are worn more then the others you don't directely have problems so that why I think you will be save. Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)

11th Apr 2010 1:04pm

Laurie

Member Since: 22 Feb 2008
Location: Sussex, England
Posts: 2897

2005 Defender 90 Td5 XS CSW Bonatti Grey

Is it legal to run different sizes on the same vehicle?
I've never thought about it.

11th Apr 2010 1:17pm

peterl

Member Since: 08 Jan 2009
Location: Pembrokeshire
Posts: 307

The only reason I ask is that they were on there when I bought the 90, just wondering if I can get a few more miles out of them.

11th Apr 2010 1:35pm

bob neville

Member Since: 30 Apr 2009
Location: Marbella
Posts: 3247

Put your tyre sizes into this calculator and you will see the answer

I don't know if you can run the different sizes together but I am sure somebody will have an answer.

http://www.miata.net/garage/tirecalc.html

Bob

11th Apr 2010 3:52pm

CFB

Member Since: 13 Sep 2007
Location: Bradford, West Yorkshire
Posts: 803

I think as long as the axle pairs match it will be fine Andy

11th Apr 2010 6:33pm

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2271

2007 Defender 110 Puma 2.4 SW Chawton White

different sizes will make the center diff work harder Puma 110" SW

.............................................................
Earth first. Other planets later

11th Apr 2010 6:39pm

CFB

Member Since: 13 Sep 2007
Location: Bradford, West Yorkshire
Posts: 803

235/85 circumference is 99.7"
265/75 circumference is 99.4"

As they are so close there will be no issue running these as long as a pair of each is on each axle as previously stated. Running worn tyres and new would have the same if not greater effect. Andy

11th Apr 2010 7:40pm

alantd

Member Since: 14 Dec 2008
Location: Northamptonshire
Posts: 1513

2007 Defender 110 Puma 2.4 XS CSW Tonga Green

So long as you have the same sizes on each axle you're fine.
A lot of cars run larger widths at the back.
Obviously you'd never want to run different widths on the same axle because they'll have different braking performance.

Those are nearly identical in circumference - use Bob's link. There was a thread on this recently and it was concluded that the extra work in the centre diff would be negligible. One that started out as a 2.4 TDCi 110 XS
+ New Defender 110 First Edition

12th Apr 2010 5:13am

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