Hankook Dynapro MTs

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Originally Posted by WingsOfToa

Sorry joel0407, ive had a real long day.

I'll have a proper look at it tomorrow.

The way I worked it out was that the 7.5mm off, was because the 235x85s were taller than the 245x75s leaving the remainder of 2.5mm. But I am mathematically challenged at the best of times. I'll try to make more sense of it tomorrow when my brain is fresher.

Thanks again!

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Nah you're right mate. I missed the 235/85 bit.

Happy Days.

Phew! 10hr a day and no good at maths. I'm happy with that! :-)

I'm still at work with 3 hours to go.

A 235/70R16 will have a 735mm diameter,
A 245/75R16 will have a 774mm diameter, 19.5mm better under diff clearance than standard,
A 235/85R16 will have a 806mm diameter, 35.5mm better under diff clearance than standard.

I run 235/85R16 with a manual Td5. Yes it's a bit sluggish off the line, but a disco isn't a sports car.

WOW Thanks Kelvo! Those sizes throw a spanner in the works.

I really should of left this alone till ive had a sleep, but are you saying that the standard size is 235x70? If this is the case, then my maths ( i admit they are rubbish), but I take this as being 735mm diameter 774mm diameter and 806mm diameter, I interpret this as 39mm height difference for the 245x75s and 61mm height difference to standard for the 235x85s which mean they would be slightly taller than a three inch lift? Or am I completely off the mark on this one?
Thanks,

Go Cooper AT3's. Brilliant tyres.

Quote:

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Originally Posted by WingsOfToa

WOW Thanks Kelvo! Those sizes throw a spanner in the works.

I really should of left this alone till ive had a sleep, but are you saying that the standard size is 235x70? Yes
If this is the case, then my maths ( i admit they are rubbish), but I take this as being 735mm diameter 774mm diameter and 806mm diameter, I interpret this as 39mm height difference for the 245x75s and 61mm height difference to standard for the 235x85s which mean they would be slightly taller than a three inch lift? Or am I completely off the mark on this one? Just off the mark, the diameter differences are 39mm & 61mm BUT the actual increase in vehicle height is half of this, hence the 19.5mm & 35.5mm increase in lift/clearance under the diff/axles
Thanks,

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Hope the answers in red help.

Quote:

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Originally Posted by WingsOfToa

61mm height difference to standard for the 235x85s which mean they would be slightly taller than a three inch lift? Or am I completely off the mark on this one?
Thanks,

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Since it's only half 61mm it's 30.5mm which is only just over an inch which is 25.4mm. The biggest differance is this is under the axle not just under the body.

For the amount of times I need the little 30mm under the diff clearance, I dont think it's worth it but thats just me.

There is heaps of theroies about narrow taller tyres cutting down to solid ground while wide fat tyre will spin and slide on top of mud. While others think the wide tread means more tread to drive and float across the top of mud with no bottom.

I just like the look of a tyre a little wider but not too wide to create drag and chew fuel. The whole co-effient of friction thing means bigger contact doesnt change traction on hard surfaces on road where you are comparing rubber to bitumen contact but in soft terrain it becomes tread contact with the ground.

Happy Days.

Thanks Kelvo! Thanks joel0407!

After 6hrs of sleep the equations all makes sense now.

I can see your point on the soft ground traction joel0407, and most of my off roading will be on the sand islands around here. But am wondering if I deflate both types of tyres to the same pressure, then there probably wouldn't be any difference in width as one has more height, so in theory should deflate wider yeah? If thats the case then the benefits would be slightly more height on harder ground, but loss in takeoff power, (which is a slight worry as I am really happy with the takeoff it has now) and am looking forward to even more power with the mapping or chip or whatever they are going to do.

So is the power difference pretty bad Kelvo? After 18yrs of driving a 94, 2.4/6?L diesel Hilux and then jumping into this one, I like going up an 80km hill at 80kms now, rather than bogging down to 40km in the Hilux.

Thanks for the heads up newlandyowner, ive spent a couple of weeks researching MTs and like the all round beating that these tyres can take as far as the reviewers are concerned. I wouldn't of ever changed from Bridgestone Desert Duellers as they have never done me wrong. But they only come in 215s at their widest.

Quote:

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Originally Posted by WingsOfToa

But am wondering if I deflate both types of tyres to the same pressure, then there probably wouldn't be any difference in width as one has more height, so in theory should deflate wider yeah?

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Again, I'm no expert as I've never had to deflate tyres for sand. Maybe I just haven't driven on sand as soft as others.

I think the theory goes tall skinny tyres will flatten out length ways more than width so they create less drag in sand too. Then again, I've never needed to deflat tyres and I like them wide.

Happy Days.