 | Home > Wheels & Tyres > My diagnostics tool thinks 7.50s are taller than 235s? |
 
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971   
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Is it correct?
 Click image to enlarge |
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8th Aug 2016 11:40am |
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| Ramsay Member Since: 30 Sep 2015 Location: Moffat, Dumfries & Galloway Posts: 632  
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Surprising.
235 with 85% aspect should be diameter of 807.5 = 2536mm circumference 7.5R16 with 100%*should be diameter of 789mm = 2478 mm circumference * can vary crossplys were 100% not sure all radials are. It may be data in the tool is for particular tyres. Not all manufacturers sizes are exact. Hence the try not to mix tyres advice. 1995 Defender 110 CSW 1971 SIIA Lightweight |
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8th Aug 2016 12:18pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971
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The maths say 235s should be 32 inch tyres and the 7.50s should be 31 inches, but those circumferences work back to 30.8" for the 235s and 31.1" for the 7.50s
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8th Aug 2016 1:13pm |
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| davew Member Since: 02 Jan 2012 Location: North Yorkshire Posts: 888  
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Looks odd, maybe the rolling diameter is larger for cross ply tyres than radials ? http://www.yorkshireoffroadclub.net/
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8th Aug 2016 1:47pm |
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