The Bontrager Presta Valve Extender 60mm is a must-have for deep section rims like Bontrager's Aeolus series wheels, these high quality extenders install between your tubular tyre's or inner tube's valve stem and removable Presta valve core. 35mm extender works with Aeolus 5.0 rims (and shallower). 62mm extender designed for Aeolus 6.5. These high-quality extenders install between your tubular tyre's or inner tube's valve stem and removable Presta valve core.  Bontrager Presta Valve Extender 60mm Features Unique closing valve prevents leakdown Must be used with removable valve core tyres or tubes Adapts the standard Presta valve for deep-section wheels