Thread: Cooper ST's on a Disco 2

g'day Chazb

didn't realize you were in Melb

i can give my mates details if you want a good price on tyres

and sound advice as well ..............

just send me a PM

cheers Ray

Originally Posted by Scouse

The '70' is actually 70% of the width. A 265 will be a taller tyre than a 245, despite them both being 70 series tyres.

MM should clarify a bit if it is a 70/16 they should be the same or damn close. I have several different old tyres in the shed in different widths and they are almost identical diameter eg 225/70/16 235, 245 and 265 in 4x4 tyres. Same in car tyres 60, 50 and 40s. I thought the 70 number was actually the profile (wall size of tyre) so therefore you could go 60/70/75/80/85 in a 16" tyre and would get some differences in overall diameter. The 16" should be the size of the inside diameter of the tyre (wheel). Please let me know if this is wrong.
Obvously different manufacturers tolerances may mean mm in difference but should not be any huge variation, tread depth may also effect eg a M/T may have a slightly bigger diameter than an A/T even though they are listed as the same size due to deeper chunkier tread on the M/T.

I have never had so many alignments,rotations etc as when I had coopers and they still wore uneven.The cooper tyre center people always blamed my vehicle(it's an old land rover was common),funny thing was never had the problem before or since.To end it the place now sells Pirelli and Michelin and don't recommend cooper. Pat

same thing here .....

never had a problem with tyres wearing uneven before them
and i dont rotate my tryes normally

but these STT you just have to

Originally Posted by CraigE

MM should clarify a bit if it is a 70/16 they should be the same or damn close. I have several different old tyres in the shed in different widths and they are almost identical diameter eg 225/70/16 235, 245 and 265 in 4x4 tyres. Same in car tyres 60, 50 and 40s. I thought the 70 number was actually the profile (wall size of tyre) so therefore you could go 60/70/75/80/85 in a 16" tyre and would get some differences in overall diameter. The 16" should be the size of the inside diameter of the tyre (wheel). Please let me know if this is wrong.
Obvously different manufacturers tolerances may mean mm in difference but should not be any huge variation, tread depth may also effect eg a M/T may have a slightly bigger diameter than an A/T even though they are listed as the same size due to deeper chunkier tread on the M/T.

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.

I ran a set of Cooper ST's on my RRC for over 100 000k's with still more than legal tread depth. I did have some chipping issues with them (this was 5-6 years ago) but this didn't affect the life of the tyre. I was very impressed with these tyres off road, but their downfall was wet bitumen. I have just put a set of 245/75/16 STT's on my D1 and am extremely happy with their grip and noise levels in all circumstances. I would recommend the STT over the ST due to the fact that I still have very good wet bitumen handling with the STT's, with more grip off road and less on road noise. I was talking to a guy in Broome the day before I picked up my tyres, who was running STT's on his D2, and his front tyres had so far done 120 000k's. Not too bad for a muddy. I did have to trim up the rear wheel arches a bit to stop them from scrubbing, and I still have to do a slight adjustment to the steering stops, but as mentioned the rear wheel arches are bigger on the D2.

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.

My 2000 disco II handbook lists 3 possible tyre and rim combos Harlie,

7J x 16 rim with 235/70 R16
8J x 16 rim with 255/65 R16
8J x 16 rim with 255/55 R18

LowRanger, if this is the case then I presume the sidewall "% of the width" numbers (70, 65, 55) decreasing as the tire width increases or rim size expands, means the overall outside diameter of the tyre remains about the same?

Dave