It's a standard 28" tube with auto 40mm length valve. STANDARD - doesn't mean ordinary: quality rubber compound combined with even wall thickness makes ACID tubes reliable and durable. ACID tubes were tested in laboratory!
For standard 28" trekking, hybrid, city tires
For tire width (ETRTO size in mm): from 38-622 to 47-622, as well as for Holland bikes from 38-635 to 47-635
Valve type: auto (Schrader / AV)
Valve length: 40 mm
: 202 g