Sunrace RDM57 7/8sp Rear Derailleur Long Cage - Black - MFPN=BAD2606 This gives you the option

This gives you the option of up to 32mm of vertical adjustment of bottle cage positioning

Low profile nylon glass fiber base for unsurpassed strength

For Installation

Model Era Size 29" Front/Rear Front Axle/Spacing (mm) 15x110 Hub Vault Hole 28 Brake 6-Bolt Rim Era Internal W 30mm Depth 18

} Affordable option to cover tires from 37mm to 62mm wide

Sunrace RDM57 7/8sp Rear Derailleur Long Cage - Black - MFPN=BAD2606 This gives you the option2: 1 actuation ratio, compatible with most Shimano 3x7 8sp drivetrains Aluminum and steel construction with 11 tooth pulleys, barrel adjuster TECH SPECS model M57 speed 7 8sp cage long min max 11 34t capacity 43t weight 355g color black