Cooper ST's on a Disco 2

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Originally Posted by TheLowRanger

As was mentioned, the 70 is expressed as a percentage of the tyres width, regardless of what the rim size is. Eg. 235/70/16 means the tyre is 235mm wide, the sidewall profile is 70% x 235mm which equals 164.5mm and the 16 is the rim size. Overall tyre diameter is 406.4mm (16") + 2x164.5 (top and bottom sidewalls) = 735.4mm. This can be used as a reasonably accurate guide, but bear in mind that different brands will have different overall diameters for the same size tyre. Using this formula, the diameter for a 265/70/16 tyre is 777.4 which means the tyre is around 1.5 inches taller than the standard tyre, therefore giving the speedo inaccuracy.

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Good explanation.
This site is useful to calculate differences between tyres
Tire size calculator

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Originally Posted by BigJon

Yes, all of those tyres listed are about the same diameter.

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Aha....and now I am confused again! So if my 1999 Disco 2 handbook says the same thing (dont have it to hand, but think its similar), is it ok for me to go and put 225/75/R16 tyres on it or not?!

I went to my local Cooper dealer at lunchtime and he definitely will not put 245/75/R16s on. He says they rub without a doubt. I kind of believe him as what does he has to lose? He is actually persuading me into getting the cheaper STs at 225/75/R16.....

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Originally Posted by McDisco

Lol - would have thought at least someone would defend the Coopers....I mean someone must be buying them right?! I just find them too expensive to consider next to cheaper and better built tyres.

Angus

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They were great on my forester!

You can fit them, but they might be a little smaller.

The 245/75 R 16 won't cause any dramas. As mentioned, a friend of mine has that size on his Disco II, although on 8 inch wide rims.

My 265/70/16 didn't rub but they looked HUGE in the arches. Now they look small with a 2" lift.

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Originally Posted by Chazb

I went to my local Cooper dealer at lunchtime and he definitely will not put 245/75/R16s on. He says they rub without a doubt. I kind of believe him as what does he has to lose? He is actually persuading me into getting the cheaper STs at 225/75/R16.....

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Any chance he has a set that he's finding hard to sell?

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Originally Posted by ak

Now I could have this wrong as the older I get the more I am losing it, but didn't Redback or someome one on here post a little while ago that Cooper ST or STT's are no good on a D2 due to being too grippy for the traction control to work properly.

Apoligies if this was not you Baz.

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Yep, I would read this thread carefully. The original Cooper ST is still the same as when it came out. There was the ST-C which is the same tread pattern but with a softer compound which they thought would prevent the outer lugs from being torn off the tyre - and this in it's limited size range has been met with mixed success.
http://www.aulro.com/afvb/technical-...007-tyres.html


I would not ever fit the Cooper ST to a Disco2. I don't believe the manufacture of the tyre is satisfactory, and I believe the fragile design of the tyre which is intolerant of wheel spin (which causes outer lugs to tear off) is incompatible with ETC traction systems.

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Originally Posted by mrapocalypse

My 265/70/16 didn't rub but they looked HUGE in the arches. Now they look small with a 2" lift.

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These are 265/70/16's on a D2 which has not been lifted.

Attachment 6151 Attachment 6152

They do fill the arches a fair bit more than the original Michelin's, but there is no problem with rubbing on anything. They have made a huge improvement in the way the vehicle rides / travels. The only problems are that the speedo is definitely a bit out, though I haven't had a chance yet to measure against GPS (I'm guessing about 10% error based on indicated speed vs rpm compared to previous), and that the spare would not fit onto the carrier in it's orginal position - had to raise it by about an inch, which is a very easy mod.

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Originally Posted by BMKal

(I'm guessing about 10% error based on indicated speed vs rpm compared to previous),

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Changing tyre size won't have any effect on the indicated speed vs RPM equation. The change is downstream of both the RPM sensing (tacho) and speed sensing (speedo) so the relationship between the two won't be altered.

I went and measured my 265/70/16 ST tyre yesterday. Here's what I came up with....
it is 265mm Wide.
It isn't 70% though.... I got 155mm from rim to tread. It should be 185!
It is 760mm in height in total. Roughly 30 inches (2.99 inches) measured.

What do we make of that?