A new 650B gravel bike built with Kaisei tubes, brazed together with lugs, a Ritchey WCS Carbon Gravel fork, a Shimano GRX 1x mechanical disc drivetrain, GRX 650B wheels and Rene Herse Switchback Hill 650B x 48mm tires.


  • Frame: Custom Mariposa frame built with Kaisei tubes, brazed together with lugs
  • Fork: Ritchey WCS Gravel Disc Carbon Fork
  • Paint: Mason red and Baffin Blue
  • Shift/Brake Levers: SHIMANO GRX RX810
  • Crankset: SHIMANO GRX FC-RX810, 40T chainring
  • Chain: Shimano
  • Bottom Bracket: Shimano BBR60
  • Brakes: Shimano Mechanical hydraulic disc GRX BR-RX810
  • Rotors: Shimano XT 160mm
  • Headset: IRD Headset Double RollerDrive Threadless (1 1/8″)
  • Stem: Nitto
  • Seatpost: Nitto S65
  • Handlebars: Nitto
  • Wheels: SHIMANO GRX 650B
  • Tires: René Herse Switchback Hill 650B x 48mm Endurance Tires, Tubeless set up
  • Saddle: Brooks B17 Black
  • Pedals: TIME, Speciale 8, Pedals, Body: Aluminum, Spindle: Steel, 9/16”, Black, Pair
  • Handlebar Tape: Mariposa Leather

SHIMANO GRX 1x Drivetrain

SHIMANO GRX 650B wheelset paired with René Herse Switchback Hill Endurance 650B x 48mm Tubeless tires.

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