CYCLAMI 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

Considerably lighter than a butyl tube although that is less important to me as I've eaten a few too many pies for the weight saving of an inner tube to be significant! For me, the biggest benefit is their compact size, as I can fit two or three in the space that used to be taken up by one tube. They do seem to hold their pressure a bit better than a butyl tube, but I have had one fail after just a few miles where the valve attaches to the tube. Despite that, I would rather use these than go tubeless.

I've had two slow punctures from these, both times on the inside, at a seam. No evidence of any piercing from outside. They're just poor quality. I won't buy again

I normally use Latex tubes or Tubeless in other wheelsets, the ride with TPU does feel more harsh than both, but the 60gms per wheel weight saving over Latex tubes (and Tubeless is also heavier depending on how much sealant is added) does make the wheels feel quicker to accelerate and will be noticeable in long climbs. Also fitting tubes is a lot less bother and less messy than Tubeless.

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.

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.

The media could not be loaded. Ordered the twin-pack. My first punctured after a couple of weeks. Disappointing, but fair enough, these things happen. However the second one I replaced it with failed overnight after installation, and it turned out to be a failure at the valve stem (see video) .. a manufacturing fault, and un-repairable. What's more, it was now beyond the 30 day return window, and there is no contact possibility with the company via Amazon at all.These are available for a fraction of the price on a certain Express website.. so paying considerably more on Amazon has no benefit when they fail. I shall persevere with these TPU tubes, but I'm going for bulk purchase from Ali Express, in the hope more than 50% are good!

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.