OPEN UPPER Shimano GRX Di2 Electronic Shifting 1x11


OPEN UPPER Shimano GRX Di2 Electronic Shifting 1x11

Brand: OPEN

Frame available. 
Contact us for estimated build times.

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Product Description

Variety is the spice of life, and this extends to bicycles. Now more than ever consumers refuse to put up with the staid and lackluster, and aim for capability. The capability to ride both on and off road with startling efficiency, stiffness and reliability with as little weight as possible, and geometry that works well both in a road group ride and a solo lunch dirt ride. Few bikes successfully do all of these things. The OPEN U.P.P.E.R. Ultegra Di2 bike might be the best gravel bike yet to do all of these things

The OPEN U.P.P.E.R. Shimano GRX Di2 Electronic Shifting 1x11 bike starts life with the ultralight OPEN U.P.P.E.R. frameset, with the option to build it in whatever way necessary. Compared to the standard U.P. frameset, the U.P.P.E.R. lives up to it's heightened name; it's OPEN U-Turn fork is the lightest gravel bike fork in class (375g), while flat mount disc brake mounts combine with a higher modulus carbon fiber layup to save a substantial 310g compared to the Classic U.P. Like the original frameset, it shares the same geometry, and importantly tire clearance; it fits up to 27.5 x 2.1” mountain bike tires, 700 x 40c gravel tires, or anything in between. It achieves this while using stack and reach numbers that are closer to an endurance road bike than a plodding touring bike; a slacker than average headtube angle, stubby 420mm chainstays, and Flatout downtube mean the bike is a performer, both on and off pavement. Other features include three water bottle mounts, a top tube bento box mount, and pencil-thin seat stays for improved compliance over rough roads.

The U.P.P.E.R. is all about versatility, so we’ve hand selected parts that offer awesome performance on road, cross, gravel, bike packing, or anything that may lie ahead. A Shimano GRX drivetrain is exceptionally smooth, reliable, offers wide gear range options. We use an Easton alloy cockpit and seatpost as a starting point, with a Fabric Scoop saddle alongside. Stan’s No Tubes is synonymous with light weight tubeless wheel and tire setups, and our two preferred wheelsets, the Stan’s Grail S1 wheelset for 700c or the Stan’s Arch S1 wheelset for 27.5”, provide an excellent combination of reliability, stiffness, and low weight. 700c wheels save weight and roll better on smoother surfaces, while the 27.5” mountain bike wheelset offer additional durability for rougher trails, and their extra width gives knobbies better bite and a plusher ride.

Whether you’re heading to Salt Lake City, or prefer we ship your OPEN U.P.P.E.R. Shimano GRX Di2 Electronic Shifting 1x11 bike to you, we’ll do a full, professional bike build, dialing in shifting and braking, truing wheels, etc. If you’re unsure about sizing, give us a call or email us at to talk through geometry and fit. And although this is a “stock bike,” we are more than happy to discuss options of this build.



Open UPPER Geometry Image

size S M L XL
rider height¹ 5’2"-5’8" 5’7"-5’11" 5’10"-6’3" 6’2"-6’7"
stack 522 551 580 604
reach 365 376 387 401
standover² 743 767 791 815
headtube angle 69.5° 71.0° 72.5° 72.5°
headtube length 105 130 155 180
fork offset 50 50 50 50
seattube length 520 540 560 580
seattube angle 72.5° 72.5° 72.5° 72.5°
seattube angle (norm.³) 74° 73.5° 73.5° 73.5°
toptube length 528 549 570 591
toptube length (norm.³) 514 540 560 581
BB drop 70 70 70 70
front center 592 598 604 622
rear center 420 420 420 420
wheelbase 1002 1008 1014 1032


Shimano GRX Di2* Electronic Shifting 1x11
Frameset OPEN U.P.P.E.R.
Shifters Shimano GRX 815
Crankset Shimano GRX FC-RX810-1 , 11-Speed, 42t (specify length)
Front Derailleur N/A
Rear Derailleur Shimano GRX 817 11 speed
Disc Brake Calipers Shimano GRX Flat Mount Brakes
Rotors Shimano RT86 160mm Front/Rear
Cassette Shimano XT M8000 11-40t 11-Speed
Chain Shimano HG701
Handlebar Easton EA50 Compact (specify width)
Stem Easton EA50 +/- 8 degree (specify length)
Seatpost Easton EA50 with 10mm setback
Saddle Fabric Scoop Elite Black
Wheelset Stan's Grail S1 Tubeless (700c)
Tires Maxxis Rambler 700x38c Tubeless (700c)
*Di2 Charger & XT Di2 Display Included.