What I initially thought was a slow puncture occurred over three months in different wheels. These were the proprietary tubes which came with the bike. No puncture in either tube, tested underwater no obstructions in rims or tyres. It can only be an issue with the values, air let down as the valves and caps held no resistance. Reading another review people seem to be having similar issues with the same inner tubes

I bought two 700 x 32-50c 60mm tubes. No matter how much I pumped air intothe valves the they would not seal. Air kept leaking form the valves.03015-0316

It shipped fast, and it’s a tube not much more to say.

I have cycled since I childhood, I'm 71 now, I do my own maintenance and still prefer the simplicity of tubes. These are some of the best made tubes I've ever used, hands down.

This has been my favorite tube for many years. These tubes are reliable and durable. Not much more you can ask for in a tube.

It’s a tube. It holds air and works.

As has been mentioned here by others, I too had issues with the two I bought. The valve on both of them came out when the pump was removed. Needless to say, I will never buy another, and I strongly recommend you stay away from these.

Great quality

These are quality tubes at a great price and delivery and pick up at my local store was a breeze.

Excellent quality and performance!