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Jman · 05-31-2008, 03:18 PM

Being the only bike geek at work one of our camp hosts asked me what the five numbers next to the tire size mean. In this case he had some Target brand tire sized 26x1.93. The the left of these numbers were 50 ### (sorry I can't remember the last three numbers were...this was at like 6 this morning so I'm just stoked I remembered to post this). Any idea what the numbers mean? My guess was possibly either metric sizing or some sort of rubber compound code. Thanks to anyone who might be able to answer.

sir crashalot · 06-03-2008, 10:15 PM

Hey Jack(?),
If the numbers are in the format 50-559, it's the metric measurement of the tire. The first 2 numbers is the tire's width in millimeters, and the last 3 is the tire's bead diameter (559 = 22"= a 26" rim). The printed metric width measurement is sometimes more accurate than whatever the tire's listed width in inches is. (especially wtb tires).

05-31-2008, 03:18 PM	#1 (permalink)
Jman Live Free, Ride Hard	Tire numbers... Being the only bike geek at work one of our camp hosts asked me what the five numbers next to the tire size mean. In this case he had some Target brand tire sized 26x1.93. The the left of these numbers were 50 ### (sorry I can't remember the last three numbers were...this was at like 6 this morning so I'm just stoked I remembered to post this). Any idea what the numbers mean? My guess was possibly either metric sizing or some sort of rubber compound code. Thanks to anyone who might be able to answer. __________________ jmansdirtloverparadise.blogspot.com '07 Heckler '07 Chameleon '06 Specialized Allez

06-03-2008, 10:15 PM	#2 (permalink)
sir crashalot defending Lady Singletrac	mystery numbers Hey Jack(?), If the numbers are in the format 50-559, it's the metric measurement of the tire. The first 2 numbers is the tire's width in millimeters, and the last 3 is the tire's bead diameter (559 = 22"= a 26" rim). The printed metric width measurement is sometimes more accurate than whatever the tire's listed width in inches is. (especially wtb tires). __________________ "Oh man, my bikes broken again" "what's wrong with it now?" "I think it needs a new rider" "That sounds expensive..."

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