The Winter Adventure Guide: Explore More in Season Four
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Niner MCR RDO 4-Star GRX 1x Gravel Bike


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  • Black/Magnetic Grey, 53cm
  • Black/Magnetic Grey, 56cm
  • Olive Green/Orange, 53cm
  • Olive Green/Orange, 56cm

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MCR RDO 4-Star GRX 1x Gravel Bike

The MCR RDO exists in the sweet spot between genres, urging us to look at the rough two-track beyond our usual turn-off and see where it goes. The MCR is not the bike we choose for traditional gravel races on graded dirt; we leave that to the RLT RDO. Nor is the MCR the bike for topping the podium on short track cross country races, for that is where the Air and RKT 9 excel. This is the bike for exploring, for going further, all while maximizing pedaling efficiency and ride comfort. With 50mm of rear travel and 40mm front suspension, the MCR allows us to ride over and through terrain that would otherwise leave us yearning for a break.

The suspension is tuned specifically for the smaller, more frequent bumps we encounter on chunky gravel roads, rather than the larger hits on singletrack. The MCR features the same constant-varying arc linkage as Niner’s full suspension mountain bikes, for a predictable and smooth travel path. Like on a mountain bike, the suspension travel of the frame allows the wheel to stay in better contact with the ground, rather than bouncing across the surface. A planted rear wheel gives us more purchase when climbing on squirrely gravel and allows for a smoother pedal stroke since we aren’t forced to coast over the rougher bits.

Every component of Niner’s 4-star build focuses on taking you further, and it only makes sense to pair the world’s first dedicated gravel drivetrain with the first full-suspension gravel bike. Shimano’s GRX 1x groupset provides precise and reliable shifts over any terrain. The rear derailleur's clutch mechanism to reduce chain slap and dropped chains for a quieter and more secure ride both on and off-road. GRX levers are shaped for optimal hand position and comfort, both from the hoods and drops, so you can keep a secure grip when the “road” your friend recommended turns into more of an array of boulders. The flat-mount GRX disc brakes control the speed through any weather with hydraulic actuation.

Rounding out the build, the 40mm Schwalbe G-One tires mounted to Stan’s Grail S1 wheels smooth out the ride, and the frame has clearance for 50mm tires, should you need something more robust down the line. Easton’s EA50 AX handlebar has a 16-degree flare in the drops, giving us a more stable center of gravity for leaning into that bit of singletrack in the middle of a route.

  • World’s first full-suspension gravel bike
  • 50mm of rear CVA suspension allows you to pedal through washboard and rough gravel
  • 11 mounting points for bags and bottles prepare you for multi-day missions
  • Integrated rear fender protects components when the road gets gritty
  • Front and rear thru-axles increase stiffness for greater efficiency and handling
  • Rear shock locks out with handlebar remote
  • Shimano GRX drivetrain keeps shifting precise and predictable over mixed terrain
  • KS Lev dropper post for getting down steeper descents
  • Item #NNR99A6

Frame Material
RDO carbon fiber
Fox 32 SC Float AX Performance Elite evol FIT4, 40mm travel, 44mm offset
Niner integrated SHIS IS42/IS52
Shimano GRX 800 11 speed
Rear Derailleur
Shimano GRX 800 GS 11 speed
Easton EA90
Chainring Sizes
Bottom Bracket
Easton PF30
Bottom Bracket Type
Shimano Ultegra HG800
Cassette Range
11 - 42t
Shimano HG 601
[front] Shimano SLX M7100, [rear] Shimano GRX 800
Brake Type
Shimano RT800 160mm centerlock
Easton EA50 AX
Handlebar Drop
Bar Tape
Niner RDO
Niner Custom, Crn-Ti rails
Niner Carbon, 400mm
Stan's NoTubes Grail S1
Stan's NEO Ultimate centerlock
Front Axle
15 x 100mm thru-axle
Rear Axle
12 x 142mm thru-axle
Schwalbe G-One EVO SS
Tire Size
700c x 40mm
not included
Recommended Use
Manufacturer Warranty
5 years

Tech Specs

What do you think about this product?


>Rating: 5

This is not a Bike

I've put it through the wringer
True to size
Size Bought
5` 9"
170 lbs

I purchased the MCR about 3 months ago after moving to southern Arizona. Upgrading from a 10 year old but well loved Stump Jumper that I used for everything including downhill ski resorts to trying to keep up with my wife on 30 mile road rides. The MCR checked all the boxes for the next bike. Comfortable geometry for long rides, and the ability to go anywhere I felt like. Fast forward 3 months and 700 miles I can say that this bike is the best I've ever ridden. One day I'll be ripping down single track with the guys on mountain bikes as they wonder how I'm leading the pack (the secret is that I have to go fast to keep stability), and the next I'm going on a 70 mile ride around the mountains with a 50/50 mix of the bumpiest gravel accents/descents and some roller coaster pavement. Every time I go out people look at this thing like its a zombie I built in my garage. Carbon fiber, full suspension, drop bars! What is a Niner? The guys I ride with are always in disbelief at where I'll take it and at the rate of speed at which I do it. As if I don't care that its a $6000 dollar bike that has skinny tires and very little front suspension. If your looking for the Toyota 4Runner/Tacoma of bikes than look no further. I've proven that this is the one bike that you can ride 20 miles to the trail on the side of the road, then do 20 miles of single track and send it all the way home and have a blast. 10/10 would recommend for fellow explores.


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