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Old 22nd October 2019, 17:23   #1
meterman66
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Rover 75 Conny SE Starlight Silver

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Default Wheel tyre sizes

Hi
I'm thinking of changing to larger wheels could somebody advise me if they will be better or detrimental to mpg.

Original size is: 215 55 16

Replacement is: 225 45 18

Odometer readins are as stated:
16" wheels at 50 mph
18" wheels read 51.27 mph

16" wheels at 100 mph
18" wheels read 102.55 mph

Overall diameter is 16.8 mm larger on the 18" which equates to +2.55%

Can't get my head around if that's better for mpg or not

Thanks
Col
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