Series 3 - tyre options on 16" disco 1 rims

Truck is in for gearbox rebuilt and he told me to put bigger profile tyres on it which will 1) fill the arch better and 2) help with my speedo as with 3.45 diffs i'm showing as doing 30mph but really at about 40 actual Currently have 235/70/16 with 2 rears showing cracks and as I've no idea of age probably need swapping anyway. Can I go to 85 profile ie 235/85/16? If so any recommendations-not doing any sticky stuff, mainly road with some green laning but only gentle stuff . Thinking about it does going higher profile make my speedo situation worse?? But will improve my mpg (currently about 11 on a 3.5 V8)
FFG

Don't know about the tyre makes but if you put higher profile tyres on, the speedo underread will be worse because you're gearing it up.

All tyres have a code on the side. It's the manufacturing date. The year is the first or last two numbers.

John S said:

All tyres have a code on the side. It's the manufacturing date. The year is the first or last two numbers.

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I've looked but can't see anything. I'm aware of the dates as I have TVR's and always end up scrapping tyres before they are fully worn. The first 2 digits are the week and the last 2 are the year and the tyre life is 5-7 years max as the rubber goes hard - not so bad on a truck but not great on a sports car. They are cracking anyway so I'd rather change them rather than risk them blowing out, especially as I'm planning on towing a caravan in the summer.

When it was pointed out to me on my Track Edges the date was 1999! I changed them pronto

If you have tyres on TVR's that you are scrapping before they are worn out you are clearly not driving them properly

Rubins4 said:

If you have tyres on TVR's that you are scrapping before they are worn out you are clearly not driving them properly

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Yes. More donuts required.............

Rubins4 said:

If you have tyres on TVR's that you are scrapping before they are worn out you are clearly not driving them properly

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Toyo R1R's on it now which are a soft compound and stick like sh!t. Only doing 1000-1500 per year.
FFG

I'd love a cerbera. What sort do you have, @FFG ?

1992 Griffith 4.3BV. Also a Rover V8. This one:
or this:
http://www.imcdb.org/vehicle_713291-TVR-Griffith-1992.html
or this:
http://www.thetvrgriffithstory.com/thecars.html
I could go on. Pretty famous car and done nearly 250k miles now. Was doing 30-40k per annum in the first 3 or 4 years of its life. Who said TVR's are unreliable!
FFG