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Old 09-02-2006
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Default Real tyre sizes..

I was running the tape measure over the TJ the other day doing some measurements after a recent 3.5" suspension lift which made my 33x12.5R15 MTRs look small, I put the tape over the tyres only to be shocked by a overall diameter of just 31.25". Whats the go there.

Is there a 33" tyre that is actually a 33".
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Last edited by RockhamptonTJ; 09-02-2006 at 08:18 AM.
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Old 09-02-2006
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Simex. Most tyres though are like that. i think they round it up in mm then round up again when convert it to inches.
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Old 09-02-2006
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Rim size, backspacing and tyre wear are also factors - correct me if i'm wrong but that same tyre on a 15x7 would measure taller... and on a 15x10 it will measure even smaller
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Old 09-02-2006
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Tyre measurements are taken diagonally

So I was always told (?), from the bottom outer edge to the top inner edge.
Its the only way some brand of tyres actually come close to their reported measurements.
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Last edited by Fat Chili; 09-02-2006 at 09:20 AM.
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Old 09-02-2006
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Quote:
Originally Posted by Fat Chili
Tyre measurements are taken diagonally
Like a TV screen - Corner to Corner ?

I guess the only solution is to have two sets of wheels and tyres perhaps, a set of 33"MTRs or similar on alloys for general touring/road/beach use and a set of 33x11.5 (true 33" dia) Simex JTs on steelies when the heavy offroad play happens or when I try to keep up with the BIG boys in their Landcruisers/Patrols/Rovers.
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Old 09-02-2006
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Quote:
Originally Posted by Fat Chili
Tyre measurements are taken diagonally
But a tyres round. and the diameter is the same all around?
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Old 09-02-2006
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even ify ou flat spot them???
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