I've been using a pair of RideNow 24g TPU tubes with clear plastic valve stems in a pair of 28c tyres. They've been great, they hold air really well. Note that they're only designed for max 28c tyres.
On another bike I use the RideNow all-road tubes with clear plastic valve stems - the 39g ones for 28c-38c tyres. Same great experience with these.
Previously I used the Offbondage 40g tubes with black&silver coloured valve stems, again no issues.
The only TPU tubes I've had issues with are:
- Older RideNow tubes with black plastic valve stems.
- Older Cyclami tubes with threaded metal valve stems.
