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1. Embed this notice
   Phil (ascentale) (ascentale@sfba.social)'s status on Tuesday, 31-Dec-2024 17:36:53 JST Phil (ascentale)

   Q3. Have you tried TPU inner tubes? What do you think of them?

   (They are made of polyurethane plastic that is lighter than standard butyl rubber tubes)

   https://commons.wikimedia.org/wiki/File:TPU_vs._butyl_inner_tubes_07.jpg

   #BikeNite #BIkeNiteQ

   • Embed this notice
     Solarbird :flag_cascadia: (moira@mastodon.murkworks.net)'s status on Tuesday, 31-Dec-2024 17:36:48 JST Solarbird :flag_cascadia:

     in reply to

     • rand

     @rand @ascentale _Something else is wrong_.

     I’ve never had to do this ever. I lose some PSI over time but nothing like that. Not even close. And I run at the top of the pressure range for my tubes, which aren’t anything special as far as I know. Something else is going on.

     (I refill when I clean my chain which is about every three weeks in summer, more like 40 days in winter; it’s distance-travelled-based.)

     Bob Jonkman repeated this.
   • Embed this notice
     Trouble (trouble@masto.ai)'s status on Tuesday, 31-Dec-2024 17:36:48 JST Trouble

     in reply to

     • Solarbird :flag_cascadia:
     • rand

     @moira @rand @ascentale inflating tires should be done weekly. The amount of air lost per week is about 15-20 psi in very high (100 psi=690 kpa) but skinny (1"=23 mm) tires. The loss is less pronounced the wider the tire. I've gone up to 3 weeks between pumping on fat 4" tires; I can feel when it's low.
     Max inflation pressure is limited by the rim, not the tube or tire. My rear rim has a chart showing max pressure as the tire gets wider.
     #BikeNite

   • Embed this notice
     rand (rand@sfba.social)'s status on Tuesday, 31-Dec-2024 17:36:52 JST rand

     in reply to

     @ascentale A3. I bought a large handful of cyclami tubes via aliexpress (for less than butyl tubes). The butyl tubes that came with my bike really didn’t hold air (topping off every ride), and I heard that the tpu tubes held air better. Spoiler, mine don’t (maybe they are counterfeit…). Then I started getting flats, repair was easy, easier that with butyl tubes, find the hole, circle it using a permanent marker (to find it again), then peel and stick. I finally found the culprit in a tiny wire embedded in my tire. Unable to remove it, I patched the tire with I think three stacked patches, and the tpu tubes have been fine sense.

     I carry two spares, and I’ve not yet had to replace one on a ride.

     And I’m resigned to pumping up my tubes on a daily basis. (The drop about 5psi over 24 hours).

     Would I recommend them? Idk, they sure take up less room, otherwise I’m not sure I notice a difference.

     #BikeNite