European Tire Sizes

[efarri1]

Anyone here know what the label of an 18.00 X 25 - 40PR tire translates to english units as? I'm trying to find the width of the tire when looking at the tire head on (when you can't see the rim).

 

[kingnero]

doesn't sound like a european way of marking tires.

Over here you'll find 225/55 - R16
meaning a tire widt of 225mm, a tire height (along the radius) of 55% of 225
and an 16" rim

 

[SlideRuleEra]

That is an off the road tire, over 5' in diameter, used on forklifts and other heavy equipment. The designation is in nominal English units, but the actual dimensions are somewhat different:

"18" is the nominal tire width, in inches. The actual width is 20.3" with no applied load, 21.3" when loaded.

"25" is the nominal wheel diameter, in inches.

"40PR" is the equivalent tire ply rating, in this case, equal to 40 plies.

See page 9 of this "General Tire" manual:

http://www.titanstore.com/pdf/GeneralOTRVol1_web.pdf

and page 3 of this "Brookstone" tire manual:

http://www.resources-international.net/index_htm_files/Bridgestone-OTR-Technical-Data-Book.pdf

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[efarri1]

That's exactly what I was looking for. Thanks so much for your help!