Finally an aerodynamic helmet with a cool look
The Ballista road helmet protects riders until they reach their goal, just like the ancient Greek throwing weapon from which it takes its name.
• The original and still the best tubeless valve stem for most rims and a perfect fit for all Stan’s BST rim models
• Durable brass construction with removable valve core makes adding sealant easy
• Fits up to 8mm valve hole
• Weight: 18g per valve
The industry standard comes in all sizes
Premium-quality Bontrager Standard butyl rubber tubes feature a 0.9mm wall thickness for the perfect balance of weight savings and durability.
Patented DirectLink System
Less than .3% loss of power due to cable stretch & housing compression, 3X better than standard cables.
A major improvement to any Road or Mountain bike gear system.
Easy installation.
