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Author Topic: How do I figure out what size inner tube?  (Read 1642 times)

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Offline philmccan

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How do I figure out what size inner tube?
« on: February 24, 2011, 03:55:12 PM »
I need a new front tire on my 1980 cb750k, and am ordering a tire online. The tire that is on there is a 3.50 H19. How do I figure out what size inner tube to order?

Thanks
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1980 cb750K

Offline Goofaroo

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Re: How do I figure out what size inner tube?
« Reply #1 on: February 24, 2011, 07:10:33 PM »
Personally, I would try a 3.50 X 19.
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Offline Stev-o

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Re: How do I figure out what size inner tube?
« Reply #2 on: February 24, 2011, 07:16:55 PM »
Quote from: Goofaroo on February 24, 2011, 07:10:33 PM
Personally, I would try a 3.50 X 19.

+1
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline philmccan

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Re: How do I figure out what size inner tube?
« Reply #3 on: February 25, 2011, 02:50:41 AM »
Your kidding me! It's that easy? When I tried to browse the subject on Google it sounded so much more difficult. Thanks guys.
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Offline Stev-o

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Re: How do I figure out what size inner tube?
« Reply #4 on: February 25, 2011, 05:57:34 AM »
Don't go to Google, come here!

PS. And don't forget rim strips.
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline MCRider

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Re: How do I figure out what size inner tube?
« Reply #5 on: February 25, 2011, 06:03:46 AM »
Tubes are usually multi-sized, so you'll likely find one that says its a "3.25-3.50/19"  or  "3.50-4.00/19". Either would work. I would prefer the smaller one if available as its easier to stuff into the tire.  The larger one would have a bit more bulk. Still it would work.
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Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline philmccan

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Re: How do I figure out what size inner tube?
« Reply #6 on: February 25, 2011, 12:24:46 PM »
Sweet, thanks guys!
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Offline Gaither

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Re: How do I figure out what size inner tube?
« Reply #7 on: February 25, 2011, 03:38:29 PM »
FWIW

In times gone by, when all tires had tubes (yeah, I'm old) we used a good bit of talcum powder in tires to "lube" the tube/tire inside.

Also, we always aired 'em up to proper pressure, removed the valve core (hang on to the valve stem so it doesn't draw into the tire - still have a "valve" tool for this) and let all the air out. This allows the tube to relax inside the tire to prevent any wrinkles in the tube (which can cause a "wear" leak later. Then, we put the valve core back in and aired 'em to proper pressure. (Yeah, I learned this the "hard way" on a car tire!)
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Gaither ('77 CB550F)
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