Niner RIP 9 RDO 4-Star XT 29 ENVE Review

September 6, 2017
Ride Quality
Power Transfer

The Good

  • Lightest bike in the test
  • Nimble despite big wheels
  • Climbs impressively well
  • Carbon rims

The Bad

  • Lower-end components
  • No chain tensioner
  • Less stable on fast descents
  • Expensive

Here’s what we learned testing the Niner RIP 9 RDO 4-Star XT 29 ENVE, the top-ranked bike in the enduro category. You won’t ride down as well if you’re exhausted at the top from a heavy, slow-climbing bike. In other words, a bike doesn’t have to be the best at descending to win this category. With carbon rims and the lowest overall weight in the test, the RIP was the best climber in our fleet of test machines. On the flats and rolling terrain it was nimble, quick, and playful. That translated into less stability on descents (testers ranked it last in descending), but when it came to overall ride quality it beat out everything else. Just know you’re going to pay a lot for it. But we feel it impacted riding quality so much that it is worth considering if you like the up as much as the down and have the cash.


The Niner RIP 9 RDO 4-Star XT 29 ENVE is a fun and playful-feeling bike. It isn’t the go to for jumps and stunts, but when it came to weaving through technical singletrack, the RIP was hard to beat. At 67 degrees, its front-end geometry was the steepest in the test, on par with all-mountain rigs. That gave it a nimble feel that ripped through technical terrain and up switchback climbs. The geometry made it really comfortable both in and out of the saddle.

Exceptional. Carbon from rim to rim made the Niner RIP 9 RDO 4-Star XT 29 ENVE the most responsive bike in the test. Wherever we wanted to put this bike we could do it with minimal effort. We only had to think about lifting front end or pushing the rear tire and it happened. A lot of this is due to the Constantly Varying Arc (CVA) suspension, which links into the chain tension to counter bobbing during pedaling. The linkages rotate in opposite directions so they can react independently to the forces of pedaling and absorbing terrain bumps. Basically, CVA keeps the bike in contact with the ground without sucking up any of the forward power.

Niner’s high-tech carbon forming process sets the mold under pressure so they can use less resin, cutting weight to the frame construction. But when it comes to the Niner RIP 9 RDO 4-Star XT 29 ENVE’s class-leading efficiency, the carbon rims are the major difference maker. They reduce rotational inertia, making it easier to push the tires uphill. This is similar to how the weight of your shoes has a bigger impact on leg fatigue than the heavy pack on your back. Lighter rims actually have a bigger impact than cutting the same static weight off other parts of the bike. So even though this is already the lightest bike in the test, it felt even lighter. The rear triangle is asymmetric, cut out on one side to provide more clearance for the rear tire, sucking it in closer to the seat. This creates a more balanced climbing position and creates more clearance for wider tires, too.

The more responsive front end of the Niner RIP 9 RDO 4-Star XT 29 ENVE detracted from its downhill stability. That’s not to say it wasn’t solid on the way down, just not as stable as the Rocky Mountain, Norco, or Specialized. With 150mm of travel in the rear, 160mm in the front, as well as 29-inch wheels, the “squish” felt similar to the other bikes in the test, adding plenty of control off drops, big hits and small jumps.

The Niner RIP 9 RDO 4-Star XT 29 ENVE would have scored lower on the components if not for the carbon rims. The Shimano XT drive train and brakes are on the lower end for the category. The Fox Factory front and rear shocks are par for the course. The Integra dropper seatpost was dependable. And the bike is compatible with 29 and 27.5 plus size tires. The jump up to carbon rims is a huge addition to this bike (about a $2,000 addition), and the key to its winning this test.

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