Mariposa Allroad Bicycle with Shimano GRX Limited Edition Groupset, 55 cm


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GRX 800 Limited Edition groupset launched in 2022.  For the launch at Unbound Gravel Race, we built this bike for Shimano.  The polished silver finish delivers a classy take on the quality, precision, and durability synonymous with GRX. The limited run of parts comes in three available spec options; 1×11-speed and 2×11-speed for drop bars, and a third, special offering of 1×11-speed for flat bar configuration.

A hydraulic/mechanical 1 x lugged frame built with a mix of Kaisei and Columbus tubing and a carbon Ritchey Adventure fork. The frame can accommodate mudguards and either 700 x 42 mm tires or 650 x 48 and is painted in the Mariposa stripes.

It is practical on most terrain. It’s comfortable to ride on the road with slick tires or on rougher terrain and single track with larger knobby tires.

Mudguard eyelets make the bike more versatile year around and the bike can easily be loaded up with bags and bottles for longer touring. The mechanical group is easier to fix when you’re in the middle of nowhere as you’re not reliant on batteries and electrical wires.

The geometry of this bike is tailored for gravel and off-road riding. The chainstays are slightly longer than a road bike which increases comfort and stability on the rougher terrain, or when loaded with bags, and also allows for more clearance for mudguards and, generally, mud clearance. The front centre is longer than a typical road bike to avoid toe overlap, accommodate fenders/larger tires, and increase comfort and stability on bumpier terrain.  It is a practically designed bike quick bike that can be comfortably ridden on all terrain for hours on end.


  • Frame: Mariposa lugged steel frame, built with a mix of Kaisei and Columbus tubing.  Fender eyelets
    • Seat Tube: 55 cm centre to centre
    • Top Tube: 56.5 cm centre to centre
  • Fork: Ritchey WCS Adventure Carbon fork with carrier bosses and accepts fenders
  • Paint: Mariposa Stripes
  • Crankset: GRX Limited Edition, 1x, 172.5 length, 42 T chainring
  • Shift / Brake Levers: GRX Limited Edition hydraulic disc
  • Rear Derailleur: Shimano GRX Limited Edition
  • Cassette: Shimano 11-42
  • Bottom Bracket: Shimano BSA
  • Brakes: GRX Limited Hydraulic Disc
  • Rotors: Shimano GRX 160mm front, 140mm Rear
  • Headset: Chris King Nothread Red
  • Stem: PRO Discover 100mm
  • Handlebar: PRO Discover Medium Flare, 42
  • Seatpost: PRO Discover Carbon 27.2
  • Wheels: GRX Carbon Wheelset (WH-RX870)
  • Handlebar tape: PRO
  • Saddle: PRO Stealth Performance Saddle

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