Help with tyre size meanings

/ Help with tyre size meanings #1  

aesmith

Silver Member
Joined
Jan 15, 2018
Messages
167
Location
Scotland
Tractor
Siromer 304 (Y385T)
Hi,

I'm familiar with the size markings for road tyres. For example our Landrover has 235/85 16 (omitting load, construction and speed rating). Meaning 235mm wide, height is 85% of width, and 16" rim diameter. If omitted, aspect ratio is 80%.

Tractor tyres seem to have either fewer or more measurements. For example 7-16 is presumably 7" wide on 16" rim. Height is what, 80% of the width like a road tyre, or something else?

Turf and some industrial have more sizing figures, for example 27 x 8.5-15. I can guess that's 15" rim diameter utility what does the 27 indicate?

See a couple of examples of agriculture and equipment turf or industrial tyres ..
Screenshot_20260214_202014_Drive.jpg
Screenshot_20260214_204140_Opera.jpg
 
/ Help with tyre size meanings #2  
The 27 indicates that it is 27" in diameter.
 

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