These are high-quality thick Kenda inner tubes. These inner tubes have a Schrader valve stem (standard wheelchair valve stem size) that is threaded all the way down to the tube. That can make it easier to inflate the first time. When you install the first time, remove stem nut, lightly fill before inserting in the tire, then run valve stem through the rim and use the nut to secure. Once the tire is on all the way, the value stem is easily accessed because it is screwed into place, no fishing around trying to push it to pump.
Kenda Part Number: TR4A
| Tire Diameter | Tire Width | Metric Tire # | Valve Type | Thron Proof |
| 20" | 1.25" - 1.5" | 28-451 to 37-451 | Schrader | |
| 22" | 1.25 - 1.75 |
|
Schrader | |
| 24" | 1" | 23-540 | Schrader | |
| 24" | 1.25"-1.75" | 28-540 to 47-540 | Schrader | Yes |
| 25" | 1" - 1.25" | 23-559 to 28-559 | Schrader | |
| 26" | 1"- 1.25" | 23-590 to 28-590 | Schrader | |
| 27" | 1" - 1.25" | 28-622 to 32-622 | Schrader | Yes |