- 155mm Rear Travel Approved to 170mm
- 170mm Front Travel Approved to 190mm
- 29" / 27.5" Mixed Wheels for SM / MD Frames
- 29" Wheels for LG / XL Frames
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Rear Suspension
V5 Kinematics
Oso
A whole new sport calls for a whole new bike. The full-carbon-fiber Oso features a dw-link rear suspension that optimizes efficiency and control, pairing 155mm of rear travel with 170mm up front. Powered by a Bosch Performance Line CX motor and a 750 Wh battery, the Oso delivers exceptional performance on any terrain—making every ride feel like it’s downhill both ways.
Geometry
The Oso is your trail companion, giving you supernatural climbing and descending ability that changes everything. Available in 4 sizes with amazing standover clearance and a long dropper post, you can comfortably get down almost anything. The slack 64-degree head angle and long wheelbase bring a new level of confidence to your off-road adventures.
Clean Interface
- Controller is integrated into the top tube, reducing cable clutter.
- Low-profile wireless SRAM GX-Transmission shifting.
- Now featuring the bar mounted Bosch wireless mini-remote.
Upgraded Frame Protection
- Beefed up downtube and motor guards—they’re thicker, stronger, and provide more protection.
- Backward compatible for all Oso customers.
Pre-wired to accept the included 900 lumen Lupine SL F Nano front light. (Installation required.)
Comes installed with a 45 lumen Lupine C14 taillight (combination seat collar + rear light combo).
Suspension
- Compatible with select air and coil shocks from Fox, Marzocchi, EXT, DVO, and Ohlins.
- Installing a 205x65mm trunnion shock provides 170mm of rear travel.
- The stock shock can be reconfigured to 65mm stroke during a normal shock service at Fox Factory or a Fox authorized service center.
- Compatible with up to 190mm single-crown or dual crown fork.
Why Bosch?
The Bosch Performance line CX has a quiet, powerful 85 NM drive unit, which offers the most natural-feeling acceleration since the invention of gravity. On top of that, you get Bosch’s two-year warranty, a network of 2,400 dealers across the U.S., UL safety-certified batteries, and its carbon-neutral operations. So, in case you were wondering, that’s why we went with Bosch.
Big Battery, Big adventures
- 750Wh battery for big adventures.
- How far can I go ?
- Powerful and durable Bosch CX Performance motor rules the hills with just the right level of assistance exactly when you want it.
Parts chosen for performance and durability
- Shimano XT brakes with 220mm rotors for confidence inspiring braking.
- SRAM Wireless GX Transmission delivers precision shifting under load.
- Gravity casing tires and durable wheels ensure reliable performance for enduro-level e-bike use.
- The Fox 38 Performance fork and X2 shock keeps it smooth and under control on the roughest of descents.
- The award winning Bike Yoke Revive dropper post is widely acclaimed as one of the best and most durable droppers available.
Warranty
- Lifetime frame warranty.
- Lifetime bushing warranty.
- Two year Bosch warranty.
Pick Your Size
The standover height on the Oso is very low for a bike with this much travel which makes fitting the bike easier. The small Oso is best in class for fitting riders in the 5'0" to 5'4" (152CM - 163CM) range. Large and extra large Oso frames are built around matching 29-inch wheels, while small and medium frames get the mixed-wheel treatment and shorter chainstays.
170mm Fork (583.7mm axle to crown)
| Nominal Size | SM | MD | LG | XL | |
|---|---|---|---|---|---|
| Seat Tube Length | A | 394 15.5 | 415 16.3 | 415 16.3 | 427 16.8 |
| Top Tube Length | B | 573 22.6 | 607 23.9 | 638 25.1 | 669 26.3 |
| Head Tube Length (4mm stack of lower cup not included) | C | 90 3.5 | 106 4.2 | 122 4.8 | 139 5.5 |
| Chainstay Length | D | 439 17.3 | 439 17.3 | 444 17.5 | 444 17.5 |
| Seat Tube Angle | E | 77° 77° | 77° 77° | 78° 78° | 79° 79° |
| Head Tube Angle | G | 64° 64° | 64° 64° | 64° 64° | 64° 64° |
| Wheelbase | H | 1206 47.5 | 1242 48.9 | 1294 50.9 | 1341 52.8 |
| BB (L/XL with Maxxis Minion 29x2.4WT tires, S/M with 27.5x2.4WT rear tire). | 341 13.4 | 341 13.4 | 340 13.4 | 340 13.4 | |
| BB Drop | K | 31 1.2 | 31 1.2 | 31 1.2 | 31 1.2 |
| Stack | I | 621 24.4 | 635 25 | 650 25.6 | 665 26.2 |
| Reach | J | 430 16.9 | 460 18.1 | 500 19.7 | 540 21.3 |
| Saddle Height | F | 655 25.8 | 705 27.8 | 765 30.1 | 820 32.3 |
| Standover | 677 26.7 | 714 28.1 | 729 28.7 | 731 28.8 | |
| Trail | 132 5.2 | 132 5.2 | 132 5.2 | 132 5.2 |
Sizing Guide (Rider Height)
| Version | V1.1 |
| Frame Material | Carbon Fiber |
| Wheel Size | 29” up to 2.5" tires on L/XL, 27.5" up to 2.6" on S/M |
| Front Travel | 170mm forks (approved to 190mm) |
| Rear Travel | 155mm (approved to 170mm) |
| Boost Axles | 148mm rear / 110mm front |
| Seatpost Diameter | 31.6mm |
| Rear Brake | 203mm post mount / 220mm max |
| Chainstay Length | S/M 439mm, L/XL 444mm |
| Bottom Bracket | NA |
| Chainline | 55mm chainline, 182mm Q Factor |
| Chainguide | Compatible with Bosch Smart System Chain Guides (M/L/XL), Gen 4 (S) |
| Headset | ZS44 upper / ZS56 lower |
| Colors | Smokey Black or Grizzly Bronze |
| Sizes | S / M / L / XL |
| Frame Warranty | Lifetime |
| Bushing Warranty | Lifetime |
| Bosch Warranty | 2 Years |
| Motor | Bosch Performance CX |
| Battery | Bosch 750 Wh Powertube (M/L/XL), 625 Wh Powertube (S) |
| Charger | Bosch Smart System Charger |
| Controller | Bosch Integrated top tube controller & bar mounted Bluetooth Mini Controller |
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Performance CX Motor, 750 Wh Powertube
Oso Specific FAQs
All our manuals are available here.
Tel: 1-833-BOSCH-EB (267-2432) or at their website here.
The Oso has a Bosch Performance Line CX Motor. Sizes medium through XL utilizes a 750 Wh Powertube battery. The Oso is charged via the Bosch Smart System Charger.
The size small utilizes a 625 Wh Powertube battery.
It takes six hours to fully charge the battery and just over two hours for a 50% charge.
Yes, but the bike is optimized around a 44 mm offset fork. The 51 mm-offset fork shortens the trail (the distance between the contact patch and the steering axis), which can cause the front end to feel less stable. We prefer it with a 42-48 mm offset fork, but the choice is yours.
The Oso is compatible with the Fox X2, Fox DHX2 Coil (MY21 and newer), Fox DPX2 (MY18 and newer), Marzocchi Bomber Air, DVO Jade X, DVO Topaz Gen 3, and öhlins TTX Air. It is not compatible with the Fox Float X, DHX, Rockshox, or Cane Creek products.
When attempting to install a shock not on the approved list, please deflate the shock and cycle through the entire stroke to verify clearance.
Yes, installing a 205x65mm trunnion shock provides 170mm of rear travel. We recommend pairing this with a 190mm Rockshox Zeb, a 190mm Fox 40 (with 48mm offset crowns), or a 180mm Fox 38.
No. The hydraulic hose's diameter is too large for the frame's internal cable tunnels. However, the Reverb AXS is compatible!
The small and medium Oso ship with a 27.5” rear wheel. The large and extra-large use a different 29” specific rear triangle. We do not recommend installing a 27.5” wheel on the large and extra-large sizes as it lowers the bottom bracket height.
No, currently we do not offer 27.5" or 29" swing arm kits aftermarket.
The Oso is designed to accommodate tires up to 2.5” wide. We recommend double-checking fitment before riding.
Due to the diverse range of free hub body types and cassette spacing, some drivetrains can accommodate different max front chainrings. The Sram GX Cable 12-speed Eagle 10/52 Tooth drivetrain can accommodate a max 36T chainring. Shimano microspline drivetrains and SRAM T Type have a maximum of 34T.
The use of oval chainrings is not approved by Bosch as they can cause issues with the drive unit.
The Oso fits a 26 oz Purist water bottle on medium, large and extra large frames. The size small frame is compatible with an Abloc Arrive S (550ml/18.5oz), Specialized Big Mouth (21oz), and Polar Bottle (15oz) when used with an Arundel Side Loader Cage.
Comes installed with a 45 lumen Lupine C14 taillight (combination seat collar + rear light combo).
Pre-wired to accept a 900 lumen Lupine SL F Nano front light. (Installation required.)
Our complete GX build in size Large weighs 53 lbs (24 kg).
If you need to update your Bosch software or diagnose an error code, we recommend visiting a Bosch Authorized Service Center. Find your nearest participating dealer here.
General FAQs
To see our general FAQs click here.
Dropper Post Saddle Height Calculations
Do not try to insert your post deeper than these measurements. Forcing the post can result in a seat tube failure.
IMPORTANT: Before riding, check the saddle to tire clearance with the dropper post fully dropped and the air out of the shock with frame compressed to bottom out. Small and Medium minimums are controlled by tire bottom out.
| Frame measurement | SM | MD | LG | XL |
|---|---|---|---|---|
| Maximum Seatpost Insertion (mm) | 206 | 230 | 230 | 234 |
Bike Yoke Revive
Measurement from center BB to center of saddle rail (mm)
| Drop | Min/Max | SM | MD | LG | XL |
|---|---|---|---|---|---|
| 125 | Min | 619 | 616 | n/a | n/a |
| Max | 711 | 732 | n/a | n/a | |
| 160 | Min | 687 | 684 | 688 | n/a |
| Max | 760 | 781 | 781 | n/a | |
| 185 | Min | n/a | 734 | 737 | 744 |
| Max | n/a | 801 | 800 | 815 | |
| 213 | Min | n/a | n/a | 801 | 808 |
| Max | n/a | n/a | 864 | 879 |
Fox Transfer
Measurement from center BB to center of saddle rail (mm)
| Drop | Min/Max | SM | MD | LG | XL |
|---|---|---|---|---|---|
| 125 | Min | 614 | 612 | n/a | n/a |
| Max | 690 | 712 | n/a | n/a | |
| 150 | Min | 668 | 651 | 655 | n/a |
| Max | 744 | 765 | 764 | n/a | |
| 175 | Min | n/a | 707 | 710 | 731 |
| Max | n/a | 821 | 820 | 835 | |
| 200 | Min | n/a | n/a | 765 | 772 |
| Max | n/a | n/a | 875 | 890 |
Reverb AXS
Measurement from center BB to center of saddle rail (mm)
| Drop | Min/Max | SM | MD | LG | XL |
|---|---|---|---|---|---|
| 125 | Min | 635 | 633 | n/a | n/a |
| Max | 736 | 757 | n/a | n/a | |
| 150 | Min | 684 | 681 | 685 | n/a |
| Max | 775 | 806 | 805 | n/a | |
| 170 | Min | n/a | 720 | 724 | 731 |
| Max | n/a | 845 | 845 | 859 |
| Hardware | Torque Spec (Nm) | Thread Treatment / Notes |
|---|---|---|
| Motor | ||
| Motor bolts | 20 | Loctite 243 if no green threadpatch |
| Motor cover Guard | 2 | Grease |
| Motor Bash Guard | 2 | Grease |
| Downtube Bash Guard | 2 | Grease |
| Upper Battery Mount | 12 | Grease |
| Lower Battery Mount | 15 (T30 Torx Bolts) | Loctite 243 if no green thread patch. Clean threads and reapply Loctite for reinstallation |
| Speed Sensor Cable Clip | 2 | Grease |
| Charge Port Exterior Bolts | Barely Tight/Just Touching | Dry |
| Battery Door Cover | Quarter turn: left to release, right to latch | None |
| Suspension | ||
| Forward Shock Mount Bolts | 12 | Inside of the trunnion mount threads should be treated with Loctite 243 (if no green threadpatch on bolt) |
| Rear Shock Bolt | 10 | Titanium Bolts: Ti anti-seize on shaft and threads |
| Linkage | ||
| Top Upper Link Bolt | 20 | Loctite 243 on threads (if no green threadpatch), grease on flange |
| Bottom Upper Link Bolt | 20 | Loctite 243 on threads (if no green threadpatch), grease on flange |
| Lower Link 6mm Side Preload Bolts | 2 | Loctite 243 on threads, grease under bolt head |
| Lower Link 4mm Pinch Bolts | 8 | Loctite 243 |
| Misc | ||
| Rear Brake Caliper | 6 | Loctite 243 |
| Seat Binder | 7 | Grease |
| Derailleur Hanger Bolt | 25 | Dry (reverse thread!) |
| Rear Axle | 12 | Grease |
Oso Gallery
