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Author Topic: Tube popped because of exposure through rim vent hole - how to prevent  (Read 645 times)

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Offline a188

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Tube popped because of exposure through rim vent hole - how to prevent
« on: June 21, 2021, 06:15:00 PM »
Hello,

I ride a CB350F and found my rear tube slowly leaking a few days ago. The hole in the tube occurred in the exact spot where there is a "vent hole" in the rim (the left hole, near the yellow sticker):



I had a tube strip installed and it seems that sunlight/chemicals/dirt wore through this specific spot in the rim strip (at the end of the Sharpie):



Which then created this hole in the tube:



From the outside, when the tube was leaking, this was my perspective (with tube strip installed):




My front rim doesn't have one of these vent holes and the tire and tube seem to be doing fine. Can I prevent this issue in the future on my back rim somehow? Is there something I could use to cover up the hole?
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Offline CaptFatCat

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Re: Tube popped because of exposure through rim vent hole - how to prevent
« Reply #1 on: June 21, 2021, 06:30:25 PM »
I always thought those holes were for rim locks.
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Resurrecting a Herman Munster CB750 from a few old baskets of K2 and K7 parts.

Offline BenelliSEI

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Re: Tube popped because of exposure through rim vent hole - how to prevent
« Reply #2 on: June 21, 2021, 06:41:16 PM »
Yes.... and none of my cb’s (400F, 550K and 750K/F) ever had any “vent holes”.
« Last Edit: June 22, 2021, 05:38:22 AM by BenelliSEI »
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Offline bryanj

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Re: Tube popped because of exposure through rim vent hole - how to prevent
« Reply #3 on: June 21, 2021, 06:51:37 PM »
Called security bolts or locks in UK, used to be common on British bikes
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline seanbarney41

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Re: Tube popped because of exposure through rim vent hole - how to prevent
« Reply #4 on: June 21, 2021, 07:54:57 PM »
Never seen rim lock holes on any 1970's sohc4's, but I don't know the 350's at all.  Is it possible that is the incorrect rim?
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If it works good, it looks good...

Offline a188

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Re: Tube popped because of exposure through rim vent hole - how to prevent
« Reply #5 on: June 21, 2021, 08:15:49 PM »
It may be the incorrect rim, but I often ride off-pavement, so getting a rim lock will be a great investment  ;)

Just purchased a rim lock and I'm thrilled to get back up and running. Thank you each for your advice
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