e*thirteen Helix Race 12-Speed 13-52T Cassette - Intergalactic Size:13-52 this rear derailleur is available

this rear derailleur is available in both short and medium cage options

Rear derailleur equipped with ""Nano Clutch

Excellent modulation and consistent braking performance

36mm stanchions

Battery life 150 Hours

e*thirteen Helix Race 12-Speed 13-52T Cassette - Intergalactic Size:13-52 this rear derailleur is availableAt e*thirteen, we're always striving to bring something new to the table. That's why we created the Helix cassette line to offer unparalleled cross compatibility without sacrificing performance. As e bikes have become more popular, we set out to engineer a close ratio cassette specifically for them. Enter the Helix Race 13 52T a 12 speed close ratio cassette specifically engineered for steep terrain where climbing speeds are high and descents are