Flat less. Ride more.
Protect yourself from flats with Bontrager Thorn Resistant tubes. Asymmetric design uses thicker rubber on the tread side and thinner rubber elsewhere, which saves weight while maximizing puncture protection.

• An asymmetric tube with thick, 4.1mm rubber on the contact side to provide better flat protection.
• 4.1mm thickness (tread side)
• Asymmetric extrusion puts extra rubber along tire sidewall and tread zones
• 100% inspected for guaranteed quality
• Purchase 20 tubes to receive a full case