"OK, I admit I was skeptical...would this really fit well? how would the loose ends butt together? Would I feel a bump on every rotation of the wheel? What did they mean by emergency repairs...would it only be good til the end of my ride, and then need to be replaced by a standard round tube? But I have a stroke damaged hand, and can really only work effectively one handed. And the prospect of not having to remove the chain, gear cable, and axle nuts was appealing. Well worth the price! The end far from the filler has a hole the filler passes through, there is no problem "butting" the ends. Neither is there any bump felt when the joint is rolled over. The rubber is very heavy duty, I do not anticipate dealing with this again until I get another thorn flat, if ever. I managed the change one-handed, coupled with normal bike tire irons, a yellow stick sold by terratrike or others (when I first bought one of these 25 years ago they were called 'ugly sticks'), and some talcum powder as a lubricant to position the tube without creasing. And a CO2 inflater...pumps don't work well 1-handed. Would advise this for any trike which doesn't have quick disconnects on the rear wheel. (Not needed on front wheels, std tubes can be replaced without removing wheels.) Well worth it, I'm very pleased."