aibiku 8.5 Inches Inner Tube for Electric Scooter, Thickened, Durable, Leak-Proof, 8 1/2 x2 Inner Tube for Xiaomi M365, for Gotrax GXL V2 Scooter, for 50/7-6.1 Tire (Pair)

Quality seems good and the brass valve stem seems durable. Wish it came pre-dusted with chalk/starch, but that is easily remedied. Word of warning, though - you WILL need some tire irons to install this thing. It is incredibly difficult to work on a tire of such a small diameter. I do a lot of bicycle maintenance and I have a few suggestions:1) Get some tire irons - these are good ( https://www.amazon.com/gp/product/B00NU928OO ) You will absolutely need them.2) Dust the tube with some sort of starch before installing (corn, tapioca, etc.). This reduces the friction between the tube and tire during inflation and will result in a better fit and longevity of the tube.3) Be sure to position the valve stem so that it is not angled forward or backward. If it is, there will be lots of pressure on the junction of brass stem to rubber tube when inflated, to the point that it may develop a leak. Do this before you work the tire back on to the rim.4) To help with the stem not pulling out during tire installation, thread the stem through the wheel and screw the valve cover on. This will help to keep it in place.5) To get the tire back on, slip the bead of the tire into the center groove of the rim on one edge - this will give you more bead to work with on the opposite end when working it over the edge of the rim. This is technique is also useful when removing the tire. You may need to re-position the bead into the wheel groove multiple times as it tends to work it's way out easily.6) If working on the rear wheel - be careful not to bend the brake rotor as you will tend to use the floor to steady things while re-installing the tire.7) Re-install the tire from the non-rotor side of the rear wheel. In other words, install the tire bead on the rotor side first (you should not need the tire irons to do this) Then work the bead in from the non-rotor side with the tire irons. This is because the rotor tends to get in the way of the tire irons, making installation even more difficult.8) Finally - be sure to check the pressure periodically. It should be at 50 PSI to help prevent pinch-flats on sharp street edges or cracks.Good luck!

They were perfect

The valve extension is the perfect addition to the purchase. The tire is a little bit of a pain to reinstall, but it is not the tube that makes it difficult. I would recommend a set bike tire levers. The tubes are thicker than the originals.

The product itself is of good quality but it's quite difficult to install. I would recommend buying the whole tire wheel and tube assembly all together in one piece. Would be significantly easier that way

Seems a little small, I was unable to get it on the rim without pinching the tube between the rim, even filling it up a little. I want to take stars off for this, but the valve extension caps and valve extender that keeps pressure are nice.I was going to return them, but I'll keep them just because it came with a pressure keeper valve extension, and metal caps that look really nice. I actually damaged a valve hitting a curb, and I think metal caps would've saved it.The tubes are nice and thick and the shraeder valves are very high quality. I'm going with a different brand that has a longer bent valve which is easier to install.I would give these tubes another chance, but I'm only using tubes until I go tubeless, so I'm going with a different brand that's easier to install and sits in the tire better. I'm also going to upgrade to 10 inch tires, which are safer and easier to install tubes anyway.

the holding tool is helpful but the whole process putting the tube on is nightmare.. Tested the tube before putting on but when I spend 1 hour put the tire back, the process is nightmare the tube must got punctured because zero air going in !

Extra thick rubber so you wont get your rubber pinched

Bought these for my sons razor scooter. Great price compared to what was listed in their website. Held air for the summer and still holding.