Oso

The Ibis Oso is Ibis’s full-power, long-travel eMTB platform, introduced for 2023 and continuing largely unchanged through the current range. It pairs a carbon frame with Bosch Performance Line CX drive hardware and a 750 Wh battery on most sizes, with 155 mm of rear travel and 170 mm up front in an Oso-specific upper-link dw-link layout. Ibis also built in unusual headroom for harder use: the frame is approved for 170 mm rear travel via a longer-stroke shock, coil compatibility, and even dual-crown forks up to 190 mm. That makes the Oso less of a lightweight all-round e-trail bike and more of a self-shuttling enduro machine with genuine park-bike ambitions.

What distinguishes the Oso is how deliberately it leans into stability. The platform uses mixed wheels on Small and Medium sizes and full 29-inch wheels on Large and XL, along with size-specific chainstay and seat-angle tuning. Combined with its long wheelbase, slack front end, and substantial system weight, the bike is aimed at riders who want traction, composure, and downhill confidence over quick handling or playful response. The 2025 Oso 1.1 changes appear to be a running update rather than a new generation, focused on Bosch control integration, revised carbon layup and stiffness tuning, and tougher guards rather than a wholesale redesign. In the market, the Oso sits as a burly, full-power carbon e-enduro bike that prioritizes range, descending poise, and technical climbing traction over minimal weight or sleek integration.

Image pending

Build

Size

Stack	650mm
Reach	500mm
Top tube	638mm
Headtube length	122mm
Standover height	729mm
Seat tube length	415mm

Fit and geometry

The Oso’s geometry is unapologetically long and stable. Across the size range it uses a 64-degree head tube angle, 31 mm BB drop, and very long wheelbases: 1,206 mm in Small, 1,242 mm in Medium, 1,294 mm in Large, and 1,341 mm in XL. Reach numbers are similarly generous at 430, 460, 500, and 540 mm from S through XL. On trail, those numbers point to a bike that puts the rider deep between the wheels and strongly favors composure at speed over quick direction changes. The 132 mm trail figure reinforces that front-end stability, especially when combined with the Oso’s mass and long-travel chassis.

Seat tube angles steepen with size, from 77 degrees on Small and Medium to 78 on Large and 79 on XL, helping keep rider weight centered for technical climbing and reducing front-wheel wander on steep grades. Chainstays are also size-specific, with 439 mm stays on S and M and 444 mm on L and XL, which helps preserve front-to-rear balance as the bike scales up. The split wheel format matters too: Small and Medium use a mullet setup for a bit more agility and clearance, while Large and XL go full 29er for rollover and momentum. Even so, the defining fit and handling takeaway is that this is a roomy, high-speed geometry package; riders looking for a compact, easy-to-flick eMTB are unlikely to find it here.

Builds

Current build information is limited, but the available Oso 1.1 GX Transmission build is listed at $6,449. Review coverage consistently frames that price as a major repositioning versus the bike’s original launch cost, and the spec is widely seen as appropriately serious for a full-power e-enduro bike. The package centers on Bosch Performance Line CX drive hardware with a 750 Wh battery, plus SRAM GX Transmission shifting and Shimano XT four-piston brakes with 220 mm rotors, a combination reviewers repeatedly singled out as especially well suited to the torque and weight demands of this category.

Suspension is built around a 170 mm front / 155 mm rear layout, and reviewers have generally viewed the Fox 38 and Float X2 package as capable rather than compromised at this price. The build’s value proposition is not low weight or boutique finishing kit, but a durable, high-capability chassis paired with drivetrain and brake choices that make sense on a 54-pound eMTB. Based on the available data, the Oso is currently offered as a focused, single-build option rather than a broad range with multiple price tiers.

1.1 GX Transmission

$6,449

Reviews

Reviewers are unusually consistent about the Oso’s core character: it rides like a very long, very planted e-enduro bike that feels calmer the faster and rougher the trail gets. OutdoorGearLab called it "brawny" and "composed," while multiple outlets described it as a "trophy truck" or "enduro battleship." Testers repeatedly praised the 155 mm dw-link rear suspension for its very supple initial stroke and strong traction, with Tweed Valley Bikes highlighting how it "flutter[s]" across braking bumps and rough chatter. Several reviewers also found that the bike climbs far better than its size suggests. Mountain Bike Action and Biker’s Edge pointed to the steep seat angles and balanced weight distribution as key reasons it can clear steep, technical pitches with unusual consistency, while the Bosch Performance Line CX motor was widely praised for smooth, natural-feeling support.

The drawbacks are just as clear. At roughly 53 to 55 pounds, the Oso is not considered lively or easy to manhandle, and reviewers from OutdoorGearLab, Mountain Flyer, and Pinkbike all noted that its long wheelbase becomes a liability in tight switchbacks and low-speed technical moves. Pinkbike and Evans MTB Saga also found Ibis’s lightly damped "Traction Tune" setup too fast in rebound for aggressive jumping or hard landings until adjusted, with one tester reporting that the bike could feel bucky before tuning. Durability feedback was mostly positive around the chassis, Bosch system, and stout parts package, but some outlets criticized peripheral details such as the flimsy battery door and vulnerable plastic protection pieces. On value, opinion shifted dramatically over time: early reviews were critical of the original $10,999 pricing, whereas later reviews from OutdoorGearLab and Blister viewed the $5,999-$6,449 Oso 1.1 as one of the stronger-value options in the full-power carbon eMTB category.