Fair Wheel Bikes tests Shimano Dura-Ace & SRAM 12 speed compatibility w/ 15.81lb Open Up gravel build!

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In addition to the Shimano Dura-Ace 9200 Di2 group on the scale, Fair Wheel Bikes also had something else to share with us this week. Namely, a 12-speed road drivetrain with components from four different manufacturers. The result is a very light Open Up with an interesting mix of drivetrains.

Fair Wheel Bikes custom Open UP build with Shimano SRAM 12 speed drivetrain mix

Why would you want to combine these different groups rather than selecting one complete drivetrain? According to Fair Wheel Bikes, it was all about that gearing.

“We just finished an Open UP gravel bike which on its own is nice but what makes this one special is that we mixed Dura-Ace 12 speed and SRAM XPLR/Red stuff to get a good gravel gearing. We also tested different cranks and rings with the Dura-Ace stuff to see what worked and what didn’t. Ended up with a 48/33t [chainring] and 10/36t [cassette] for gearing, which in my mind is pretty ideal for gravel.”

Fair Wheel Bikes custom Open UP build with Shimano shifters 9200

Fair Wheel Bikes custom Open UP build with mixed drivetrain

Fair Wheel Bikes custom Open UP build with Carbon-Ti chainrings

The drivetrain is made up of Shimano Dura-Ace 9200 shifters and derailleurs, a SRAM Force XPLR 10-36t cassette with RED Flattop chain, and a Lightning carbon road crank with 48/33t Carbon-ti chainrings. Fair Wheel claims to have tested the system enough to verify that the shifting works well while providing a 48-10t high gear, and 33-36t low gear for extra help up the steep bits.
Fair Wheel Bikes custom Open UP build with Carbon-Ti brake rotors
While the brake calipers are the standard Shimano 9200, they clamp down on Carbon-Ti 160/140mm rotors mounted to Carbon-Ti Centerlock hubs.
Fair Wheel Bikes custom Open UP build with Mcfk stem
The build may feature some of the lightest parts out there, but that hasn’t stopped Fair Wheel from including the Cane Creek eeSilk+ carbon suspension seatpost. Additional cockpit components include an Mcfk carbon stem, FSA K-Wing AGX carbon handlebar, and a Specialized S-Works Phenom Saddle.
Fair Wheel Bikes custom Open UP build with their own bottle cages
The build is finished off with Fair Wheel’s own V2 Carbon water bottle cages and tubeless valves. The cages weigh in at 22g each, and are available in 3k weave or UD carbon finishes, both in matte or gloss finish for $35 each.
Fair Wheel Bikes tubeless valves
The valves are offered in 48 or 60mm lengths, and in six colors. They look to be fairly basic aluminum bodies with a brass valve core, but they’re also attractively priced at $7.50 for each valve and weigh just 4.6 or 5.1g respectively.
Fair Wheel Bikes custom Open UP build
All together, the Open Up checks in at 15.81lbs (7.17kg) with 700c x 38mm Panaracer Gravel King SK tires. 
Build List
  • Open Up Frame (Small)
  • Cane Creek AER headset
  • Carbon-Ti top cap
  • Lightning cranks 165mm
  • Carbon-Ti Rings 48/33t
  • Carbon-Ti chainring bolts
  • HSC Ceramic Bottom Bracket
  • Shimano Dura-Ace 9200 derailleurs, levers, brake calipers
  • SRAM RED Flattop chain
  • SRAM Force Xplr 10-36 cassette
  • Carbon-ti Centerlock hubs
  • Enve G23 Gravel rims
  • Sapim Cx-Ray spokes
  • Carbon-Ti thru-axles
  • Carbon-Ti rotors 140/160
  • FSA K-Wing AGX handlebar
  • Mcfk carbon stem
  • Specialized S-Works Phenom saddle
  • Cane Creek eeSilk+ carbon suspension seatpost
  • Panaracer Gravel King SK tires 700c x 38mm
  • Fair Wheel tubeless valves
  • Fair Wheel bottle cages

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