27.5in

Bulk packaged replacement tubes
Shrink wrapped - No header card or display box

OPTIS (Odyssey Pneumatic Tire Insert System) is a lightweight, highly tunable, high-efficiency, tubeless tire insert
Dual valve mechanism allows inflating the insert, and surrounding tire to two different pressures where the higher pressure insert supports the tire, and the lower pressure zone improves grip and performance
If tire pressure is suddenly lost due to a puncture, the interior higher pressure OPTIS allows the rider time to stop without losing control
Optis pressure the tire into the bead, preventing burping as well as helping to seat the bead and easing tire installation and seal

Flat Attack Freedom Tubes are pre-injected with Flat Attack
All Freedom Tubes come with the Flat Attack 5-year guarantee
Supports IBD
Not sold in `Big Box` stores

Slime tubes come pre-gooped with Slime Tire Sealant which repeatedly seals punctures up to 1/8 of an inch

Utili-T Thorn resistant tubes feature a 3.7mm tread side for increased puncture protection

Utili-T Thorn resistant tubes feature a 3.7mm tread side for increased puncture protection