E*thirteen Helix Plus Cassette - 12-Speed 9-50t S2BBW NiMH or Lithium recommended

NiMH or Lithium recommended

your weekly vigorous activity and resting heart rate to estimate if your body is younger or older than you are

Power Supply: DC5V/2A DIMENSIONS & WEIGHT

•    BMS protection

it creates a versatile and customizable riding experience

E*thirteen Helix Plus Cassette - 12-Speed 9-50t S2BBW NiMH or Lithium recommendedHelix Plus 12 Speed 9 50T cassettes are a drivetrain upgrade on a budget for analog and e bikes alike. Engineered to deliver Helix shifting precision, and cross compatibility with all SRAM and Shimano 12 speed drivetrains, the Helix Plus is also e*spec rated to withstand the rigors of e MTB. e*thirteen's exclusive 9 tooth highest gear cog, provides a 556% gear range, and lets you step down one chainring size, while keeping the same top end gearing,