235/85R16 vs. 265/75R16 vs. 255/85R16

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Originally posted by Greylandy
Hi Anthony,

I'm very impressed with the wear on my BF muddies. I've done 45,000kms now with lots of tread left. I reckon they'll easily go to 80k. Just make sure you rotate them every 10k ..

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Excuse this novice question but by rotating, does this mean swapping the front to the back or the left to the right or does it just mean sticking the tyre randomly on another corner of the car.......is there a scientific or considered reason for doing it any particular way?

Running to 265/75R16 BFG Muds on my Disco II with a 2" lift and they have performed admirably to date, no gaurd cutting or rubbing even at full lock and full articulation - very happy with them!!

Aye, Mick

Correct me if I'm wrong - but I think that the rotation goes something like this:

Back Left to Front Right
Front Right to Back Left
Front Left to Back Right
Back Right to Front Left

:idea: I'm sure I saw another tread on tyre rotation in the Tec foroum - I will try and find it

Here it is

http://www.aulro.com/modules.php?name=Foru...iewtopic&t=8135

Mick - this shoul help

Hi All

Does anyone know how I can calculate the diameter of a tyre size 7.5R16 (ie my Michelin XPCs). I want to compare it to 235/85/16R (what I may end up getting for the Defender)

Nice one Steinzy, mine are due for a rotation soon.

Aye, Mick

Quote:

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Originally posted by JamesH
Hi All

Does anyone know how I can calculate the diameter of a tyre size 7.5R16 (ie my Michelin XPCs). I want to compare it to 235/85/16R (what I may end up getting for the Defender)

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Try this if you like:
http://www.carbibles.com/tyre_bible.html
and scroll down to "Classic / vintage radial tyre sizes" where you can convert imperial to metric (I don't know how accurate their conversion is though).

It has a tyre difference calculator at the end.


I use this one for "normal" car tyres:
http://www.miata.net/garage/tirecalc.html

Quote:

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Originally posted by JamesH
Hi All

Does anyone know how I can calculate the diameter of a tyre size 7.5R16 (ie my Michelin XPCs). I want to compare it to 235/85/16R (what I may end up getting for the Defender)

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Hi James try this link

http://members.shaw.ca/jbarge/tires.html

I shows about 1/10th of an inch difference, not sure if that is case diameter or full tread although I thought that there was minimal difference between them diameter wise just the 235's are wider by a half inch.

Quote:

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Originally posted by lewy110
In bfg mud terrains

235/85-r16 is 32inch O/D

255/85-r16 is 34inch O/D

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255/85-R16 is 33.3" O/D

And perfect size for Defender without mods.

Cheers
Mike

Quote:

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Originally posted by Greylandy
Hi Anthony,

I'm very impressed with the wear on my BF muddies. I've done 45,000kms now with lots of tread left. I reckon they'll easily go to 80k. Just make sure you rotate them every 10k ..

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Interestingly look around the tread edge where it meets the sidewall.
Lots and I mean lots of BFGs at the moment have little dots (like a raised full stop) around the edges.

These are belt wires poking up under the surface and making their way to the outside ready to fail.

This is a frighteningly common occurance at the moment and we have had 3 people with relatively new BFG Muddies fail (blowout) on suburban roads.

BFG is failing to recognise this (must be related to LC100 suspension warranty blokes! :twisted: ) but the fault is definately there in the post 2004 BFG tyres.

I used to run them, now I wont touch them. Go Goodyear or Mickey Thompson/Dick Cepek. Now there is a strong tyre! And the FC-II is awesome, even in slop for an agressive AT.

My next set for the spare rims will be the new MTZ due Feb 06. (avail now but in Feb they will have Oz sizes)

Cheers
Mike

Mike

Yes, The BF's seem to have an issue also with the edge near where the bead seals.

When off-road and you drop your tyre pressure, when driving through mud, it tends to work it's way between the bead and the rim, causing the tyre to deflate or slowly leak. There's a couple of letters in the current 4WD monthly on this topic.

Plus I also had this same problem on my BF's prior to my MT/R's, had 2 flat ytres and took a couple of hours to get then re-inflated once i was able to clear the crap out from the bead and have them seal (one still leaked, had to stiop 3-4 time on the way hokme and re-inflate :evil: :evil: ). I was considering going back but after hearing about this issue I'll stick with my MT/R's even if they are a bit pricey.

The MT/R's are highly recomended, have 3 ply sidewall as well like BF's, without the tyre bead hassles.

Trav