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Busta
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04 Apr 2018 07:20 #191278 by Busta

Replied by Busta on topic POWER!

That is of course true (although rarely by a linear 10% at all speeds), but my point still stands. If your reference, however inaccurate, has moved by 10% then your expectations are also off. The system for measuring speed and distance has changed by a significant amount.

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sniper
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04 Apr 2018 07:37 #191279 by sniper

Replied by sniper on topic POWER!

Running BFG AT's at 215/75x15 is only 40mm larger in circumference than standard and whilst it is noticeable, it does seem to have lined the speedo up with road side speed warnings.

sniper

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helijohn
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04 Apr 2018 08:01 #191280 by helijohn

Replied by helijohn on topic POWER!

sniper wrote: Running BFG AT's at 215/75x15 is only 40mm larger in circumference than standard and whilst it is noticeable, it does seem to have lined the speedo up with road side speed warnings.

sniper

Yes same here - same tyre size and same result.

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Busta
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04 Apr 2018 12:47 #191284 by Busta

Replied by Busta on topic POWER!

I'm running 215/75s and my speedo now matches GPS (true) speed and speed warning signs. From memory they are 5-6% bigger than standard, and my average miles per tank went from 210 to 200 (5% drop), so it all correlates quite nicely. My fuel economy has not suffered from running bigger tyres.

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1066Boy
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04 Apr 2018 16:53 #191290 by 1066Boy

Replied by 1066Boy on topic POWER!

I have the same results with 215/75/15. Speedo now spot on according to my GPS. My mpg is down slightly around town but a little better on long runs.

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Mraz
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05 Apr 2018 04:13 - 05 Apr 2018 08:00 #191304 by Mraz

Replied by Mraz on topic POWER!

When I change from alloy rims and road tires to steel rims and MT there's a difference, most noticabely in braking performance (same dimensions, only heavier). I can only guess how it handles with bigger tires and stock engine/gearbox

Last edit: 05 Apr 2018 08:00 by Mraz.

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