38g 1/2PCS Ultralight 700C Bike Inner Tube TPU Road Bicycle Tire 28'' Compatible with 700x18/23/25/28/30/32C Presta Valve 45/60/80mm(Include Bike Inner Tire Patch Repair Kit)

I ride the road bike tires at 70psi on 30mm contis. These save about 80g over latex and 180g over butyl. They do lose ~20psi pressure over 2weeks so need to keep an eye on that. Haven’t noticed the noises when riding that others mention. They ride well and are small and light. Also easier to put on than butyl. Expensive but not crazy expensive - I would be a bit worried about how well they would survive in the saddle bag for a few months waiting to be used in event of a puncture but I guess we will see. Certainly a relatively cheap way to lose rotational weight - losing 200g off my wheels would cost a lot more than £24

Yes they are light but quality is poor. One developed a major tear and the other a slow leak within a week of install. Waste of money.

Pich flat first time out but very light and able to fix flat with one of the patches supplied. Pink colour is a bit Anne Summers.

They're good. They feel almost as good as latex. They have almost the same hum sound when rolling as latex. They don't hold pressure as well as butyl tubes, seems they lose about 10 PSI every 2-3 days. So, they need more air pumping than butyl. Had a very small, about 1mm puncture after 1000 km. Used the patch that comes with the tubes, made sure to clean the area around thoroughly, applied it without any extra glue, and it just stuck. Doesn't seem to want to come off. I have ridden it patched for another 100km, the the pressure held well as the non patched tube. So, the patches seem to do their job very well. The only downside to these is the price. I think you can get packs of 4 or 8 if you buy straight from China, for the same price as a pair on Amazon. So, keep that in mind.

Two of these innertubes saved me 207g off my butyl innertubes, rolling resistance is good, on rough roads they do feel a bit better than butyl tubes, i'm using 30mm tyres at 70psi, i.ve done several rides without any problems, they do lose a bit of preasure after about 4 to 5 days, i don't know how good they to patch and i would buy more if i need them.

So I bought four of these inner tubes back in February and have just started using my bike early March then one bike ride 25 miles without any issues then on the second bike ride I had a puncture but the puncture was on the join on the inside and had failed on the weld joint. This has also happened to 2 more of the inner tubes so it's a manufacturing defect on three out of the four. I am waiting for a response from the manufacturer.

The weight and folded size savings are obvious (I can confirm stated weight is correct) They ride well and I haven’t noticed any odd noises. Easier to fit than butyl as well. They will lose a few PSI each day in my experience but I tend to check and top up tyre pressure before each ride anyway. After 100 miles I experienced my first puncture; a fair sized thorn through the tyre casing - no tube would have survived. Once home, I used the supplied patch to repair (inflating the tube in the sink to locate the air leak) which seemed to work but I think that inflating the tube outside of the confines of a wheelset weakens these tubes and increases the porosity of the TPU. Tube was refitted but would go flat overnight without any obvious remaining air leak. I inflated to somewhere a little over 5psi. Tube in the bin and lesson learned.

Fitted these to my GP5000 road tyres 700x32c. They are most certainly more comfortable and faster than the tubes I ran previously. I have only covered about 300 miles so far, but they feel just as good as my tubeless tyres on my other bikes. No problems fitting but if its your first time on TPUs read the instructions, if you inflate to much outside the tyre they will be unuseable and must be discarded, I only needed 2psi for the install. I have used another well known and much more expensive brand of TPU before, these seem much stronger and better designed at the valve tube interface, which is a known weakspot on TPU tubes. Fast delivery and well packaged.