2025 Ibis Cycles Oso 1.1 EMTB

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.

• Lifetime frame warranty.
• Lifetime bushing warranty.
• Two year Bosch warranty.

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

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.

Component	Standard Component	Upgrade / Option
Fork	Fox Performance Series, Float 38, 170mm, 29”, 110mm x 15mm
Shock	Fox Performance Elite Series X2, 205mm x 60mm
Motor	Bosch Performance Line CX
Wheels	Blackbird Send Aluminium Rims, Ibis Hubs, SM-MD: 29”/27.5”, LG-XL: 29”
Front Tire	Maxxis Assegai, 29” x 2.4”, 3C MaxxGrip, DD, TR
Rear Tire	Maxxis Minion DHR II, 29” x 2.4”, 3C MaxxGrip, DD, TR Size SM–MD comes with a 27.5x2.4" rear tire.
Brakes	Shimano XT, M8120, 4 piston
Rotors (F/R)	Shimano SM-RT66, 220mm
Crankset	SRAM X1 E-MTB, 34t Steel Ring
Rear Derailleur	SRAM GX Eagle Transmission
Shifter	Eagle AXS Controller
Cassette	SRAM GX XS 1275 Eagle Transmission 10-52
Chain	SRAM GX Eagle Transmission
Chain Guide	Ibis Top Guide
Headset	Cane Creek 40 ZS44/ZS56
Grips	Lizard Skins Charger Evo Single Clamp Lock-On
Handlebar	Blackbird HiFi Carbon, 31.8mm, 30mm Rise, 800mm
Stem	Ibis 31.8mm S–M: 40mm, L–XL: 50mm
Seatpost	Bike Yoke Revive Dropper 31.6mm SM:125mm, MD: 160mm, LG: 185mm, XL: 213mm
Saddle	SDG Bel-Air, V3

 

Geometry

 

Nominal Size		SM	MD	LG	XL
Seat Tube Length	A	394	415	415	427
Top Tube Length	B	573	607	638	669
Head Tube Length (4mm stack of lower cup not included)	C	90	106	122	139
Chainstay Length	D	439	439	444	444
Seat Tube Angle	E	77°	77°	78°	79°
Head Tube Angle	G	64°	64°	64°	64°
Wheelbase	H	1206	1242	1294	1341
BB (L/XL with Maxxis Minion 29x2.4WT tires, S/M with 27.5x2.4WT rear tire).		341	341	340	340
BB Drop	K	31	31	31	31
Stack	I	621	635	650	665
Reach	J	430	460	500	540
Saddle Height	F	655	705	765	820
Standover		677	714	729	731
Trail		132	132	132	132