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Gravel Complete Bicycles

Niner RLT 9 RDO 4-Star GRX 2X

Niner's 4-Star Shimano GRX 800 2x complete build delivers Ultegra-comparable GRX performance at a great price level. With DT Swiss G 1800 Spline 25 wheels, Schwalbe tires, and an Easton 2x chainring carbon crankset, this is one of the best gravel-grinding packages available. In 2020 Niner updated the RLT 9 RDO Frameset for wider tires and an overall geometry that offers improved stability and agility with either 650b or 700c wheels/tires. The generous tire clearance is now capable of supporting 700x50c or 650bx2.0 options. In re-conceiving the RLT 9 line-up, Niner has essentially made the carbon RDO, Steel, and Alloy versions with the same features. While the RDO is still lightweight, responsive to pedal load, and gravel race worthy, it also has 26 mounts to accommodate bags, cages, fenders, racks, and lights. This assures you can have the performance and compliance with full gravel genre capability. Niner has also changed the fork to a 12/100mm thru-axle, as more gravel-oriented wheels are being made with that standard. Flat Mount disc brake caliper interfaces keep the set-up clean.

Along those lines, the updated fork has internal brake hose and dynamo hub cable routing features. The frame is compatible with wired, wireless, geared, singlespeed, 1x, and 2x drivetrains, with updated End-to-end, Full Sleeve internal cable guides for RDO, and dropper post routing. The entire system is easier to use, and features better optimized access points and ports. Niner has opted to stay with the PF30 bottom bracket shell. While some may question this, it was important to Niner to give the most flexibility in crank and bottom bracket choices, including the ability to run the RLT 9 RDO as a single-speed with their Biocentric option. With great thread-together type bottom bracket options now available, you can get a zero-creak interaction with the PF30 system. The seattube allows you to run a clamp style front derailleur for 2x drivetrains or is left bare with a 1x set-up. Niner has kept the desirable 27.2mm diameter seatpost specification, and they do recommend a 400mm version so you have safe insertion length and increased compliance with the sloping-style frame.

The Race Day Optimized carbon CCS frame lay-up process has been proven throughout the Niner mountain line-up and is perfect for the RLT platform. The tube shapes, junctions, and tapered headtube all create incredible torsional stiffness under heavy pedal load as well as rough surfaces. Vertical compliance ensures reduced rider fatigue and discomfort. The rear dropout features a 12/142mm thru-axle system with a replaceable hanger, while- as mentioned- the fork now has the 12x100mm thru-axle. As Niner develops and builds the frame and fork to be fully complementary, the ride and overall characteristics are matched for a unified feel and consistent performance.

The overall RLT 9 Fireroad geometry returns, with comparable final numbers as the previous generation, the model year 2020 frameset achieves this despite increasing tire size capacity and the requirements of both 700c and 650b wheel options. Clearly when using the 650b option at lower tire volume sizes, the standover and BB drop will be different, which may also affect fork trail. Most of these differences are subtle and Niner worked at creating the proper combination of stability and handling, along with a feel that results in agility in either wheel size. The frameset will track cleanly, yet offer cornering responsiveness you need on tighter and/or more technical terrain even when you are loaded up for bikepacking. While mentioning adventure based features, it should be noted that Niner has also created a line of direct mount bags that simplifies bike set-up and offers a clean, efficient gear storage system.


  • Performance and value in Niner 4-Star GRX 2x complete build of the RLT 9 RDO carbon frameset
  • Redesigned RLT 9 RDO carbon frameset that offers incredibly overall capabilities
  • Generous tire clearance now for 700x50c or 650bx2.0 tires
  • Light enough and stiff enough to satisfy the most selective gravel racers, yet compliant and well suited to gravel, adventure, bikepacking, etc
  • High-grade Race Day Optimized (RDO) carbon fiber frame and fork
  • Tested to ISO MTB standards for strength and durability
  • RDO carbon fork with internal brake, dynamo hub cable routing, 12/100mm thru-axle
  • Refined Fireroad geometry combines stability with agility with either wheel size
  • 26 integrated, fixed mounting points for custom bags, bottles, lights, fenders and racks
  • Compatible with wired, wireless, geared, singlespeed, 1x, and 2x drivetrains
  • End-to-end, Full Sleeve internal cable guides for RDO, and dropper post routing for all
  • 1⅛"x1½" Tapered integrated (Campy style) Niner headset included
  • Seatpost diameter required: 27.2mm, suggested length 400mm
  • Versatile PF30 BB shell for geared and singlespeed options, accepts Biocentric
  • Flat Mount disc brake caliper interfaces, 160mm max rotor rear
  • Dropout system: 12/100mm front, 12/142mm thru-axle, bolt-on versions included
  • Front thru-axle detail specifications: M12 x 1.5P x 125L; many riders prefer a handle/lever style thru-axle for the front wheel for easier transport, storage
  • 4-Star GRX 2x Build Kit Specs:
    • Shimano GRX 2x/Brakeset/Drivetrain
      • 11s GRX800 Dual Control Shift/Brake levers with calipers, GRX800 GS Shadow Plus RD; R8000 FD, Easton EC90 Carbon 47/32T Crankset, PF30 BB
      • Ultegra RT800 160mm Center Lock rotors, HG800 11-34 cassette, CN601 11s chain
    • Wheelset/Tires/Cockpit
      • DT Swiss G 1800 Spline 25 wheels TLR, Center Lock, 12/100 TA front, 12/142mm rear
      • Schwalbe G-One Allround EVO Super Terrain TLE Addix Speedgrip Tires, 700x45mm (w/ 2 oz Stans's sealant)
      • Easton EA50 X Handlebar, Niner Carbon 27.2/400mm Seatpost, Niner Carbon 31.8mm Stem
      • Niner Custom Saddle w/ CRN-TI rails, embossed Niner graphic, Niner Bar Tape
  • Sizes: 47, 50, 53, 56, 59, 62 cm
  • Color: Baja Blue/Sand, Olive Green/Orange
  • Weight: 20.2 lbs (53cm)
Niner RLT 9 RDO
Size 47cm 50cm 53cm 56cm 59cm 62cm
Wheel Size 700 700 700 700 700 700
Stack 535mm 556mm 577mm 592mm 613mm 634mm
Reach 362mm 366mm 374mm 384mm 398mm 405mm
Head Angle 70° 70.5° 71° 71.5° 72° 72.5°
Seat Angle 74.5° 74° 73.5° 73° 73° 72.5°
Top Tube Length 510mm 525mm 545mm 545mm 585mm 605mm
Head Tube Length 105mm 125mm 145mm 165mm 185mm 205mm
Standover 693mm 731mm 693mm 780mm 804mm 827mm
Fork Offset 45mm 45mm 45mm 45mm 45mm 45mm
Bottom Bracket Drop 75mm 75mm 75mm 70mm 70mm 70mm
Front Center 581mm 589mm 600mm 611mm 626mm 626mm
Wheelbase 1000mm 1007mm 1017mm 1030mm 1045mm 1045mm
Chainstay Length 430mm 430mm 430mm 430mm 430mm 430mm