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Diamondback el Oso Tres

Diamondback el Oso Tres
  • Color: Gloss Black
Gloss Black
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We designed Diamondback's el Oso Tres to be capable of any adventure you point it at. Of course, you might argue that a fat bike with a suspension fork is overkill, what with the high-volume/low-pressure Maxxis Minion FBF/FBR 26x4.0-inch tires already soaking up rocks and gripping Mother Earth like they were slathered in glue. Then again, we built this bike with the most remote and technical trails in mind. When you're days away from the nearest trailhead, a burly, winter-tested fork plus a reliable parts package all come in really handy. The KS E30i dropper seatpost improves maneuverability on dicey downhills. Thru-axles front and rear add stiffness for enhanced steering precision. Overkill? Heck. Yeah. Bring on the overkill. Bring on the adventure.

- The 6061-T6 aluminum frame/fork with hydroformed tubes packs a punch without also packing extra weight
- Manitou Mastodon Comp 100mm travel fork clears your way through the toughest terrain
- Powerful Shimano SLX M7000 hydraulic disc brakes increase your control
- No mountain is too steep with Raceface Aeffect cranks and Shimano 1x11-speed drivetrain components
- Maxxis Minion FBF/FBR 26x4.0" tires provide gobs of traction
- KS E30i dropper seatpost lets you drop that WTB Volt Race saddle and improve maneuverability on dicey downhills

Dropper posts

A dropper seatpost allows you to quickly lower and raise your seat to give you an ideal riding position. Dropping your seat creates a lower center of gravity for better control and maneuverability on steep descents, while raising it puts you at normal riding height for efficient pedaling.

Construction can include either hydraulic- or cable-actuated systems and the post’s travel can either be infinitely adjustable or stopped at set intervals, depending on the model.

Dropper seatposts come in standard lengths and diameters and vary by the amount of travel.


Frame El Oso 6061-T6 Double Butted Aluminum, Formed Top and Down Tube, 1.5" Tapered Machined Headtube, Fits up to 26x5" Tire
Fork Manitou Mastodon Comp, 100mm, 34mm Stanchion, 3 Position Compression Adjust, VTT Cartidge, Hex-Lock Thru-axle, 1.5" Taper Steerer
Headset FSA No.57, Sealed Cartridge
Axles Front: 150 x 15mm thru-axle
Rear: 197 x 12mm thru-axle
Rims/Wheels Sun Ringle Mulefüt SL 80mm
Hubs Sun Ringle, 32h Alloy, Sealed Cartridge Bearing
Spokes 14g Stainless Steel
Tires Front: Maxxis Minion FBF 26x4.0" EXO, TLR, Folding
Rear: Maxxis Minion FBR 26x4.0" EXO, TLR, Folding, 120tpi
Crankset Raceface Æffect, Direct Mount
Chainrings 28T Narrow Wide
Bottom Bracket Raceface Outboard Bearing
Chain KMC X11 EPT Anti-Rust, 11 Speed
Rear Derailleur Shimano XT M8000 Shadow Plus, 11 Speed, GS
Cassette/Rear Cogs Shimano XT M8000, 11 Speed, 11-46T
Shifters Shimano XT M8000 Shadow Plus, 11 Speed
Handlebars DB35 Alloy, 760mm Wide, 15mm Rise, 35mm Bar Bore
Tape/Grips DB4L 135mm Lock On
Stem DB35 Alloy, 60mm Reach, 35mm Bar Bore
Brake Levers Shimano SLX M7000
Brakes Shimano SLX M7000, w/180mm Front / 180mm Rear Rotors
Pedals DB CNC Platform, Sealed Cartidge Bearing w/Replaceable Pins
Saddle WTB Volt Race
Seat Post KS E30i Dropper, SM = 125mm, MD/LG/XL = 150mm w/Southpaw Remote
Accessories & Extras Tool Kit, Carbon Paste

* Subject to change without notice.

Part Numbers

Option UPC MPN
Gloss Black / Small 791964573616 02-0210590
Gloss Black / Medium 791964573623 02-0210591