Innertube valve stem clarification - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 14 (permalink) Old 11-08-2015, 12:12 PM Thread Starter
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Innertube valve stem clarification

Can anyone clarify the difference between tr87c and pv78 valve stems? I currently have the 90 degree angled stem (which I prefer), but don't ever remember choosing a model type. I'm about to replace my rear tire and tube, and have always bought the "angled" stem. I'm now noticing there are different models? I don't know how this has evaded me before. They both look identical on seller websites and there is no specific clarification regarding these two versions on line. Thanks.

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post #2 of 14 (permalink) Old 11-08-2015, 01:13 PM
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That's interesting. When I wanted to order a rear tube and tire I had a difficult time locating online the correctly sized tube with an angled valve stem and there was no notification of any spec other than it has a 90 degree angle. Do the sellers have any info about the different stem specs?
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post #3 of 14 (permalink) Old 11-08-2015, 03:59 PM Thread Starter
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I've been having that same problem too. However, I found that Bridgestone accommodates my need for the Vulcan's rear inner tube. If you link at the link provided, you'll notice the second and third image have different stem models.

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post #4 of 14 (permalink) Old 11-08-2015, 04:22 PM Thread Starter
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I found my answer, thanks to an eBay ad. Apparently, the pv78 types are a taller version of the angled stem. The tr87 appears to be standard, thus a sufficient size. Here is the diagram below:


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post #5 of 14 (permalink) Old 11-08-2015, 08:44 PM
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Quote:
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I found my answer, thanks to an eBay ad. Apparently, the pv78 types are a taller version of the angled stem. The tr87 appears to be standard, thus a sufficient size. Here is the diagram below:

Pagman, I had trouble with the stem types too when replacing tires- ultimately relying just on what photos were available that matched the originals. If you are saying the TR87 stem (in the image) will work, it appears there's no threads and lockdown nuts on that stem, which I believe are needed. Are we on the same page?

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post #6 of 14 (permalink) Old 11-08-2015, 09:39 PM
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Quote:
Originally Posted by Pagman View Post
I found my answer, thanks to an eBay ad. Apparently, the pv78 types are a taller version of the angled stem. The tr87 appears to be standard, thus a sufficient size. Here is the diagram below:

Quote:
Originally Posted by redfish View Post
Pagman, I had trouble with the stem types too when replacing tires- ultimately relying just on what photos were available that matched the originals. If you are saying the TR87 stem (in the image) will work, it appears there's no threads and lockdown nuts on that stem, which I believe are needed. Are we on the same page?
Hmmmmm??? Both of these posts make me wonder how unbalanced this makes your tire. Or if added weight is necessary to balance your tire. I use beads so I guess they would offset the stem.

But getting to a straight stem sure is aggravating. An add on 90 would be cool. Gotta go see if I can find one.

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post #7 of 14 (permalink) Old 11-08-2015, 09:43 PM
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Well....that didn't take long. Might have to get a set. For $2.50. Worth a try.

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post #8 of 14 (permalink) Old 11-08-2015, 09:50 PM
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Well....that didn't take long. Might have to get a set. For $2.50. Worth a try.

2X 90 Degree Brass Air Tyre Extension Valve Motorcycle Car Truck Bicycle Scooter | eBay
Nice! Didn't know those were available.

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post #9 of 14 (permalink) Old 11-10-2015, 06:47 PM Thread Starter
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I highly doubt there would be an issue of balance regarding types of valve stems. After all, they are made by reputable companies to be placed into tires. I currently have a 90 degree valve stem on my rear tire and never felt an imbalance. Also, I have a skull head valve cap on that. If your shop is balancing your tire (as they should), then keep in mind that your tire is returned to you already balanced. I just never knew there were options for different angled and straight stems.

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post #10 of 14 (permalink) Old 03-02-2016, 03:32 PM
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Hate to dig up an old thread, but I am now in the same boat. Going to replace my tires this spring and I would like to put a tube in the rear with a 90 degree valve stem. Not sure what to go with. I am going with a 170/80-15 tire.

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