keany1976 · Mar 7, 2014

I know it's another tyre question but I've been searching on here for an answer that would be understood by a numb nut like me but....

On defender 90 now I have standard issue 5.5inch wide steels with 205/80 r16's.

I would like to change to 235/85 r16s (on new wider rims)

I understand this will affect the gear ratio etc but what I want to know is will it affect it so drastically that I would need to do something about it? And if so what?

If it's a big deal I would prob just stick to what I have! I just prefer tyres a bit more substantial.

neilly · Mar 7, 2014

If you are asking about the speedo gear, then I would ask you , " how accurate is your current speedo on the tyres you have?"

I have 285's on mine and when I have checked with GPS, my speedo measues absolutely spot on.

Cheers

Lowlight · Mar 7, 2014

Same here - when I went up to 235/85/16's my speedo was far more accurate. It was miles out on the standard rubber.

keany1976 · Mar 7, 2014

Thank you v much - I was told a few conflicting story's but I'll go ahead and order the wheels now without having to change my gearbox....;-)

Thanks again !

jamesmartin · Mar 7, 2014

frc3310 is correct speedo drive but as said try your first

landowner · Mar 7, 2014

Quite a difference in size, same swap as I did

keany1976

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neilly

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Lowlight

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keany1976

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jamesmartin

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landowner

Pensioner Pete

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