CST 80/100-21 TR4 Inner Tube

CST Extra Heavy Duty MX / Enduro Butyl inner tube.

All CST/Maxxis inner tubes are made from Butyl rubber, this has a much greater impact and burst resistance than the cheaper natural rubber inner tubes.

It gives less unsprung weight and better protection from punctures than sometimes thicker wall natural rubber tubes may do.

2.6mm Butyl rubber walls.