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Does anyone know of a calculator or know what the roling radius of the


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There is a calculator on the Beds, Herts, Cambs Land Rover Club website. I dont know if this is exactly what you need though?

There is also an MPG calculator on the same page.

CLICKY

Thanks , ill take a look

Im trying to compare the rolling radius of a 225/55/19

To the simex 32/10.50/16

so i can make final drive calculations for my TDV6 defender conversion.

Pete

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Thanks , ill take a look

Im trying to compare the rolling radius of a 225/55/19

To the simex 32/10.50/16

so i can make final drive calculations for my TDV6 defender conversion.

Pete

32/10.5/16 is size in inches - 32" diameter, 10.5" wide, 16" diameter rim.

225/55/19 is metric size - 225 mm wide, 55 is aspect ratio of width the section height as a percentage (225 mm wide x 55/100 = 124 mm high), 16" (16 x 25.4 = 406 mm) diameter rim. Then tyre diameter is 406 mm + (2 x 124 mm) = 654 mm (25.7").

As Lars L said, all sizes are nominal only.

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32/10.5/16 is size in inches - 32" diameter, 10.5" wide, 16" diameter rim.

225/55/19 is metric size - 225 mm wide, 55 is aspect ratio of width the section height as a percentage (225 mm wide x 55/100 = 124 mm high), 19" (19 x 25.4 = 482.6 mm) diameter rim. Then tyre diameter is 482.6 mm + (2 x 124 mm) = 730 mm (28.74").

As Lars L said, all sizes are nominal only.

Thank you very much for your detailed explnation.

Pete

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32/10.5/16 is size in inches - 32" diameter, 10.5" wide, 16" diameter rim.

225/55/19 is metric size - 225 mm wide, 55 is aspect ratio of width the section height as a percentage (225 mm wide x 55/100 = 124 mm high), 16" (16 x 25.4 = 406 mm) diameter rim. Then tyre diameter is 406 mm + (2 x 124 mm) = 654 mm (25.7").

As Lars L said, all sizes are nominal only.

Need to add 3" as its a 19" Rim. 28.7" Diameter

Your 32's would be about an 11% increase

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The calculation for circumfrence is pye x d or pye x 2r.

Where pye is 3.14 (plus lots more decimals if you need to be very accurate)

and r is the radius.

If you want a reasonable accurate value (calibrating an aftermarket speedo?) the best way is to park on level ground check you tyre pressures are correct then meaure from the centre of the hub to the ground for a value for r.

It will vary for the same tyre depending on tyre pressure / wear / rotation speed etc so high precision is not normally needed.

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Need to add 3" as its a 19" Rim. 28.7" Diameter

...

Thanks for the correction. I must have had a seniors moment when writing that post (not used to the wheel sizes on some new vehicles).

I hope it is obvious to others that I should have used 19" instead of 16" for the wheel diameter.

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