R438/R439 Front Derailleurs hydration pack A Tarmac that’s approximately 30

A Tarmac that’s approximately 30 seconds faster over 40 kilometers

while a synthetic suede palm combines durability and grip

The DLC coating provides a super smooth surface for optimal stability

the shoe offers 12 separate points of tension adjustment to dial in the perfect hold across the entire foot

you benefit from the rising rate in the last 30% of the GENIE stroke

R438/R439 Front Derailleurs hydration pack A Tarmac that’s approximately 30A classic design that's backwards compatible with older road drivetrains, the microSHIFT R438 and R439 front derailleurs feature quality construction and modern functionality that provides smooth shifting. Compatible with 9 speed Shimano road drivetrains Designed for use with 52 42 30t chainrings