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Product Description


The Orbea Occam TR allows the rider to choose whether they prefer 29er or 27.5” wheels. This model is the one version that comes equipped with 27.5+ wheels.

A quick explanation of plus (+) is in order. Wide rims and tires do lots of good for every rider. Even when you put a standard tire on a wide rim, the contact patch increases for better traction, the increased air volume minimizes pinch flats and increases comfort, and the changed relationship of the tire sidewall to the rim wall means that the tire is less likely to fold over under hard cornering, making it easier to hold the line. All in all, a plus. The Plus standard here means 2.8” tires mated with a wide rim. That’s a big, wide tire, a generous air chamber, which can not only cushion the ride, but improve traction, and make up for less-than-perfect lines. Riders on the less-experienced end of the scale will treasure them, as will those who ride in loose conditions as well as those who like to ride the edge of control.

Otherwise, this is the same Occam TR OMR you’ll find with 29er wheels. The goal was getting your trail bike so it can take in more without losing the benefits of a light bike and an agile climber was the mission. They accomplished that by sticking with their basic geometry ideas, increasing the travel on the front end to 130mm, keeping the 120mm travel in back, and improving shaping. Now, you’ll find the TR with a 67.5-degree head angle, 74-degree seat angle, 435mm chainstays, and 340mm bottom bracket height. Thanks to the Boost spacing, there’s greater bottom bracket width, which not only gives room for wider tires, but also improves lateral stiffness.

Beyond the geometry, there’s Orbea’s inexorable advancement of technology. On either side of the rear hub is Orbea’s new rear triangle design. The rear triangle actually does without any pivots by the rear axle, which offers several benefits. Without pivots, the rear end is 150g lighter. Without pivots, there is less to break, less to maintain, less to go wrong. And the UFO stays have vertical compliance designed into them, thanks to both fiber alignment and shaping. The stays are where much of the small-bump sensitivity comes from, which makes it easier for the shock to take care of bigger things.

Orbea doesn’t leave suspension duties to an off-the-shelf shock. They worked with Fox on this 120mm-travel Float DPS three-position shock. The action has been tuned thanks to Orbea’s Advanced Dynamics analysis. The leverage ratio curve is designed to have a starting sag at around 25% of travel to further small-bump sensitivity. Then, up to 40% the leverage ratio decreases slightly. And about 50%, the leverage ratio rises to better work with the air spring. It’s controlled by a three-position lever on the bars, which also allows for on-the-go adjustments for the Fox 34 Float with 120mm of travel. The travel of the TR bike is 20mm less than the AM, to better work with the larger wheels.

The fork and shock are merely the taming of the trail. Your power and control start with the geometry, and Orbea had a pretty strong idea of what they wanted. Something that was comfortable, stable, and fast. So they developed angles and tube lengths that provide a long reach for stability with shorter stems. Below, they lowered the bottom bracket (340mm), for even more stability. To make for better climbing, they went with short chainstays (435mm). They paired the short stays with a steep seat angle (74.5-degrees) for improving climbing efficiency. And then, up front, they went with a slack head angle (68-degrees), to provide predictable steering in steep and/or rough terrain.

Then they worked on manipulating their material of choice. Carbon-fiber. Specifically, Orbea’s top-shelf OMR carbon: their lightest, stiffest grade. The main triangle is monocoque for minimizing weight and maximizing strength and durability. The head tube hides a tapered steerer, 1 1/8” to 1 ½”. Which leads to an oversized downtube, which widens on its way to the oversized BB92 bottom bracket. When paired with the flattened top tube, the frame represents an advance in torsional strength. Then Orbea builds on this. Thanks to the wide bottom bracket, the chainstays are set wide, which aids not only in torsional stiffness, but durability. In fact, Orbea sets all the moving elements of the frame on widely-set oversized bearings. The oversized bearings are more durable, move more easily, and, of course, add to the stiffness and durability of the frame.

In order to both stay with the times and prepare for the future, all the cable routing is internal, including room for cabling a dropper post. On the exterior, the front derailleur mount is easily removed or converted if you prefer a single ring setup.

The Orbea Occam TR OMR Plus gives the confidence to go deep.


  • Bottom Bracket SRAM
  • Brake Calipers Shimano XT M8000 Hydraulic Disc
  • Brake Levers Shimano
  • Cassette SRAM XG-1275, 10-50
  • Chain SRAM GX Eagle
  • Crankset SRAM X1 Boost, 32t
  • Fork Fox 34 Float Performance 130 3-Position, QR15x110
  • Frame Material Monocoqu OMR Carbon Boost, 29/27.5+, 12x148
  • Front Derailleur None
  • Handlebar Race Face Aeffect 35, 10mm Rise, 760mm
  • Headset FSA 1 1/8"-1 1/2" Integrated
  • Pedals Not Included
  • Rear Derailleur SRAM GX Eagle
  • Rear Suspension Fox Float DPS Performance 3-Position Evol Custom Tune, 184x44mm
  • Rotors Shimano
  • Saddle Selle Italia XR Trail
  • Seatpost Race Face Aeffect Dropper, 31.6mm
  • Shifters SRAM GX Eagle
  • Stem Race Face Aeffect R, 35mm Interface
  • Tires Maxxis Rekon+, 27.5"X2.80
  • Wheel - Front DT M-1700 Spline TLR
  • Wheel - Rear DT M-1700 Spline TLR



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