e*thirteen Helix Race 12-Speed 13-52T Cassette - Intergalactic Size:13-52 Rear derailleur equipped with ""Nano

Rear derailleur equipped with ""Nano Clutch

36mm stanchions

these shifters deliver unprecedented reliability

Battery: Li-Ion polymer battery (4000mAh)

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

e*thirteen Helix Race 12-Speed 13-52T Cassette - Intergalactic Size:13-52 Rear derailleur equipped with ""NanoAt 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