CST rubber inner tubes are designed for use with clincher tyres and rims. These 29 x 1.90/2.35 tubes are available with either a straight Schrader valve or a Presta valve. There are a variety of sizes of Presta valves, see below for more detail.
TUB1140: 33mm Schrader Valve
29 x 1.90/2.35 Inner