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Old 03-01-2013, 08:40 AM   #1
projectmrod OP
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probably a dumb question about tubes/tires

So ive got a Kenda k761 that im going to put on my rear, its size is 120/80/18 and the tube i got is a 110/100-18 (it lists 2 other sizes but thats the closest) anyways


I took it to a honda dealer cuz they usually do a quick install.

Anyways, the guy wanted to wait 3 days for a new tube to get delivered because he wanted to order a 120/80/18 exact tube.. and i was like uhh i'm pretty sure this guy will fit..

just wondering what your thoughts are
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Old 03-01-2013, 09:22 AM   #2
crypto666
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Can you imagine what women go through watching the guy deal with a condom?

I wouldn't be too concerned about it, it tends to be restricted to a certain size by the tire and rim.
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Old 03-02-2013, 09:00 AM   #3
markk53
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Quote:
Originally Posted by projectmrod View Post
So ive got a Kenda k761 that im going to put on my rear, its size is 120/80/18 and the tube i got is a 110/100-18 (it lists 2 other sizes but thats the closest) anyways


I took it to a honda dealer cuz they usually do a quick install.

Anyways, the guy wanted to wait 3 days for a new tube to get delivered because he wanted to order a 120/80/18 exact tube.. and i was like uhh i'm pretty sure this guy will fit..

just wondering what your thoughts are
Obviously the dealer service manager or whomever made that uneducated decision has no mathematical sense.

My bet is the cross sectional area of a tube made to fit a 120/80 (slightly oval with a major diameter of 120mm and minor diameter of about 100mm) will be so close to that of a tube made to fit a cross sectional area of a 110/100 (perfectly round) that there is no rational physical reason to not use the 110/100 in place of the 120/80 tube. The guy is a dim bulb.

The math for this would be that between the 110/100 and the 120/80 there is 10mm difference in width - less than 1/2" going from a 120mm to a 110mm width - BUT the difference from the 110/100 height to the 120/80 height is about 1/2" (that 80 indicates a 20% reduction in profile)... Can you say "the same"? I thought you could.

Try explaining this to that guy that wanted to order the 120/80 tube. But don't don't be surprised if it just goes right over top of his head...
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Old 03-02-2013, 09:38 AM   #4
kubiak
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Laugh

the guy either doesnt know much or he is going by the book so his boss wont fire him.
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Old 03-02-2013, 07:33 PM   #5
bmwktmbill
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Put the right sized tube in.

Ever break a condom.
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