The Z4 Cage is the first cage optimized for Between-The-Arms aero hydration.The new patent pending Speedfil Z4 Cage is the first cage optimized for BTA (Between The Arms) aero hydration. The Z4 Cage works with standard water bottles, as well as the Speedfil A2. Garmin Integration. The Speedfil Z4 integrates a detachable arm which can hold a Garmin Quarter Turn Bike Mount* to the top of the cage when used in a BTA configuration. This not only saves precious space within the aerobars but also provides easy access. Data is now

NO BRAND:  length: 16cm

Precision CNC Machining: The spoke holes on the flanges are CNC drilled with absolute precision

VTDR Endcaps Rear hub 142/12mm thru axle

SRAM GXP road or mountain cranksets

Function: Mountain bike rear derailleur hangers do a great job of protecting your bike from damage in the event of a fall

whose main function is to change the speed of the bicycle when moving by controlling the transmission

Diameter: 1-1/8"x52x $30or$39

1x Bike Rear Derailleur Hanger

Bicycle rim liners are products that help seal the ends of bicycle spoke holes

Press diameter: φ41*φ41

Banana spokes: This type of spoke has a special shape

Internal wiring