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Product Description


Orbea revamped the Occam because they saw a way to make the ride give you the best of both trail and cross-country riding. And they did it in two flavors: 27.5” and 29er. The Occam AM OMR is the top of the 27.5” (aka 650b) range. It’s for both people who want something a little more playful on descents and/or have a smaller stature.

They started with the geometry. 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 (425mm). They paired the short stays with a steep seat angle (75-degrees) for improving climbing efficiency. And then, up front, they went with a slack head angle (67-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 1/2”. 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.

And to further improve lateral stiffness and long-term durability of the frame without impacting weight, they opted to embrace the Boost standard for both the front and rear wheels. In front, it’s an 110x15mm thru-axle. In the rear, it’s 148x12mm thru-axle. Greater width means wider triangulation for the spokes resulting in a laterally stiffer wheel. And the wider stance of both the fork and the rear triangle further improves lateral rigidity in the frame.

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.

The shock itself a 140mm travel Fox Float DPS, is the result of a collaboration between Orbea and Fox. The action has been tuned thanks to Orbea’s Advanced Dynamics analysis. The leverage ratio curve is designed to be set 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 140mm of travel.

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.

With all the ingredients together, the resulting brew is one incredible ride. The bike is playful even on the trickiest descents and the climbing doesn’t suffer one bit for it. The Occam AM OMR is a new paradigm for riding, one that blurs the lines. Which is good, as off-road riding is supposed to be without limits.


  • Bottom Bracket Shimano
  • Crankset Shimano XT M8000, 32t
  • Frame Material Orbea Monocoque Race Carbon, Boost 12x148 Rear Axle
  • Front Derailleur None
  • Handlebar Race Face Next SL, 35mm, Flat 740mm
  • Headset FSA 1 1/8" - 1 1/2" Integrated
  • Pedals Not Included
  • Rear Derailleur Shimano XT M8000 GS Shadow Plus, Direct Mount
  • Rear Suspension Fox Float DPS Factory 3-Position Adjust EVOL Kashima Custom Tune, 184x44mm
  • Rotors Shimano
  • Saddle Fizik Gobi M7
  • Seatpost Race Face Turbine Dropper, 31.6mm
  • Shifters Shimano XT M8000 I-Spec
  • Stem Race Face Aeffect, 35mm Interface
  • Tires Maxxis Ardent TLR Exo Dual, 27.5"X2.25
  • Wheel - Front DT Spline M-1700 TLR 15/110mm CL
  • Wheel - Rear DT Spline M-1700 TLR 15/110mm CL

Bike Geometry

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