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MikeXX
8th January 2011, 06:47 PM
Hi,

I am wanting a new set of tyres for my Defender and would like to fit muds, however I do not want a shock regarding fuel consumption. I understand the critical factor is rolling resistance but am unable to find data. Just wondering if anyone knows where to look?

Thanks

Mike
isuzurover
8th January 2011, 07:11 PM
I doubt you will be able to find comprehensive data anywhere.

As long as you aren't fitting rag tyres like SATs I don't think you will find much increase in fuel consumprion - 10% at most).
KarlB
8th January 2011, 07:29 PM
Wikipedia has a good explanation of rolling reistance: Rolling resistance - Wikipedia, the free encyclopedia@@AMEPARAM@@/wiki/File:Rolling_Resistance.PNG" class="image"><img alt="" src="http://upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Rolling_Resistance.PNG/220px-Rolling_Resistance.PNG"@@AMEPARAM@@commons/thumb/c/c3/Rolling_Resistance.PNG/220px-Rolling_Resistance.PNG

Cheers
KarlB
:)
MikeXX
8th January 2011, 09:59 PM
Thanks for advice,

Existing tyres are Michelin XPC 750 x 16

Thinking of fitting Goodyear Wrangler MTR 235/85 R16 on Wolf wheels

I do know of a couple of cases where people have made similar changes and have noticed 4 mpg difference.

Mike
isuzurover
9th January 2011, 02:45 AM
Thanks for advice,

Existing tyres are Michelin XPC 750 x 16

Thinking of fitting Goodyear Wrangler MTR 235/85 R16 on Wolf wheels

I do know of a couple of cases where people have made similar changes and have noticed 4 mpg difference.

Mike

I have 285/75-16 MTRs on one vehicle and 255/85-16 Maxxis Bighorns on another (similar tread pattern but much cheaper than MTRs). I get good economy from both vehicles, but I do run them at ~45 psi on road.
defender_sg
9th January 2011, 09:15 AM
Hi there, I've had my 2000 Defender Xtreme about 18 months. The truc came with a set of ageing Cooper ST's which i replaced with the Wrangler MTR's about 12 months ago. I can't say that there was any appreciable difference in Fuel consumption between the two sets of tyres and the Wrangler's have a much more open tread pattern. If you stick with the same tread width & profile I don't see why fuel consumption would increase by any appreciable amount.