Bought some RideNow TPU 700C inner tubes from Aliexpress late summer. Arrived as expected, nicely packaged, bright pink colour, no quality concerns, tube weight varied, some were 36g others a little under or over. The bulk buy included repair kits, each comprising two small wipes and two self-adhesive patches.
First impressions, the tubes are impressively light and much smaller than a conventional inner tubes although I’m not sure I noticed any major difference when riding.
Care is needed when fitting as they are one size 700x18-32C, more tube to push up into the tyre to avoid pinching.
Downside as mentioned is that puncture repair is not so easy and little if any long term real life experience on how reliable repaired tubes are.
My repair method, identify puncture, wipe area, apply patch and apply pressure for an hour or so. (I now place a piece of stiff cardboard either side of the tube patch and gently squeeze in a vice, bonkers).
Overall great value, impressive size and weight, I will certainly ride these tubes in the summer.