Outside diameter Insa dakar

[James-lw83o]

I’m doubting myself with tyre diameter, hoping someone can help.
I’m currently running 17x7” with 235/65r17 road tyres and want to drop to 16x8” with 235/70r16, likely with an Insa Dakar.
Using aspect ratio I get the following:
Current set up- 29” diameter
New set up- 28.95”

So it shouldn’t be an issue, however I keep doubting it. Am I right or am I missing something?
Does anyone run 235/70r16 Dakar’s on 8j wheels, if so what’s the outside diameter?

[InitialDave]

An aggressive tyre's extra tread depth may make it larger in diameter even if it ha the same nominal carcass size as another tyre.

I'd get a tape measure out.

Is your concern gearing/speedo reading, or clearance against arches etc?

[Greener Jim]

Cheers mate thanks. Arch clearance is the concern, don’t mind the speedo being a little out.

If needs be I will go 235/60r16 which would help quite a lot

Edited by Greener Jim on Monday 2nd April 15:07

[PhillipM]

Use this size on the buggy - the Goodyears of the same pattern as the Insa's in 235/70R16 were just shy of 30.5" new - the 235/70R16 Fedima Extreme's we run now are closer to 31"

[KevinCamaroSS]

You are not missing anything, the difference is actually a nominal 0.08" in diameter with the 16" being smaller, differences in tread depth excluded.

[Darkslider]

What vehicle is it on? The pistonheads answer is to go to a 235/85/16 and trim off whatever catches. It'll look the dogs!