The Ibis Oso HD Ebike Frame is the foundation for a gravity eMTB built your way

What Our Gearhead® Experts Are Saying:

"I recommend the Ibis Oso HD Ebike Frame to riders who want to build a gravity eMTB on their own terms. The full carbon construction, slack geometry, and Bosch CX Gen 5 motor integration give you a solid foundation, and the modular dropout system lets you fine tune the build as you go. This is a frame that keeps up with your ambition."

Who It's For

Experienced builders who want a carbon gravity eMTB platform built for serious terrain.

The Oso HD Ebike Frame is for riders who know what they want to build and need a carbon platform to match. Three colorways include a shock.

What It's For

Building a custom gravity eMTB on a carbon platform made for serious terrain.

Built for shuttle laps, bike park days, and terrain that demands 180mm of travel and a slack geometry. Bosch CX Gen 5 motor integration is built in.

Why We Like It

A purpose built carbon gravity frame with modular geometry and clean motor integration.

Full carbon with gravity tuned geometry across five sizes. The modular dropout system supports chainstay adjustment and both 29 and 27.5 inch rear wheel configurations.

Bosch CX Gen 5 motor integration with a lower, centralized battery position for better balance. The 600Wh PowerTube battery is PowerMore compatible for up to 850Wh total.

Heads up. We do our best to keep bike specs and images current, but occasional component changes can happen without warning and sometimes the photos might not show the exact build you'll receive. If you want to double check the details, our Gearheads are always here to help.

Details

Full carbon construction keeps weight down and stiffness up on rough terrain
Gravity tuned geometry across five sizes so the fit is right from the start
Modular dropout system lets you adjust chainstay length as your build evolves
Bosch CX Gen 5 motor integration built in so your drivetrain choices stay open
600Wh PowerTube battery with PowerMore support for longer days on bigger terrain
Long dropper post compatibility across all sizes keeps your position dialed in
Three colorways ship with a shock so you can get riding sooner
UDH dropout compatibility opens up a wide range of derailleur options
Item #IBSB0FH

Frame Material: carbon
Suspension: dw-link
Rear Shock: Fox Factory Float X2
Rear Travel: 165mm
Fork Travel: 180mm
Seatpost Diameter: 34.9mm
Rear Axle: 12 x 148mm
Activity: enduro
Manufacturer Warranty: lifetime

One Frame, Three Trail Modes

Find Your Model

Mountain biker wearing MTB helmet and shorts sending jump on full-suspension mountain bike through wooded forest singletrack trail

OSO HD

Shuttle laps and big mountain descents

180mm front / 165mm rear travel

Gravity geometry gets riders to the top faster for another run down

Oso HD Eagle 90 Ebike Oso HD Ebike Frame

OSO Trail

All-day missions and backcountry access

160mm front / 150mm rear travel

Efficient enough for long climbs, capable enough for technical descents

Oso Trail Eagle 90 Ebike Oso Trail GX Transmission Ebike

OSO Sport

Local trails and fast flowing singletrack

140mm front / 160mm rear travel

Less travel makes the bike more responsive and agile on tighter terrain

Oso Sport Eagle 90 Ebike

Inside The Oso

Quiet Motor, Real Torque

The Bosch Performance Line CX Gen 5 runs quiet on the trail. It delivers high torque with natural-feeling pedal assist that responds to input rather than fighting it

Close-up of integrated battery extender mounted on water bottle holder.

All-Day Battery, More If You Need It

The internal 600Wh battery sits low in the frame, improving balance and handling. Add the optional PowerMore 250Wh extender to reach 850Wh total for longer routes

Built To Change With Your Riding

Swap the shock and fork to convert between HD, Trail and Sport travel. Bolt-on dropouts let riders fine-tune chainstay length and switch between 29" and 27.5" rear wheels

Five Sizes, All Dialed

Every frame size gets its own geometry, so the bike fits and handles correctly for your height. A new Extra Medium sits between Medium and Large, covering the height range where 80% of Ibis riders land

Full Suspension, No Compromise

dw-link suspension manages pedaling, braking and trail input independently, so the bike stays efficient on climbs and controlled on descents

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Built To Fly

Ibis Cycles started in 1981 when founder Scot Nicol opened a tiny workshop near Mendocino, California, with no big plan beyond building mountain bikes that were fun to ride and tough enough for the rough stuff. Today, from its home base in Santa Cruz, Ibis remains a small, rider-owned company focused on doing a few things really well: designing carbon and aluminum mountain bikes that climb efficiently, descend playfully, and feel lively every time you point them down the trail. With long-time owners and in-house engineering still deeply involved in the day-to-day, the brand stands for bikes that are light, durable, and above all, a blast to ride—whether you are racing, lapping local trails, or just chasing that next perfect corner.

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Oso HD Ebike Frame