The CST 24 × 1.90/2.125 AV inner tube is designed for 24" tyres, providing reliable air retention and durability for everyday cycling. The Presta (AV) valve allows precise inflation with compatible pumps. Ideal as a replacement or spare tube for children’s bicycles, BMX bikes, or small-wheel bicycles.

Specifications:

• Brand: CST
• Wheel size: 24"
• Tire width: 1.90–2.125"
• ETRTO: 50-507
• Valve type: AV / Presta
• Material: Butyl rubber – elastic and airtight
• Packaging: shrink wrapped
• Weight: 182 g