Bicycle Archive · Specification report

2026 Ibis Oso S 90

Velopedia Archive ID 900000652

Overview

Model year	2026
Brand	Ibis
Model	Oso S 90
Bicycle type	Electric-assist
Archive ID	900000652
Original MSRP	$7,999.00
Colors	Silver Surfer
Sizes	S / M / XM / L / XL

Frameset

Frame construction	Carbon Fiber
Frame material	Carbon Fiber
Fork	RockShox Pike, Base, 140mm, 29”
Rear shock	RockShox Deluxe Select+, 210x52.5mm

Drivetrain

Shifters	SRAM Eagle 90 Transmission
Rear derailleur	SRAM Eagle 90 Transmission
Crankset	SRAMSM-MD: SRAM 90, 155mm, 34T Steel Ring XM-XL: SRAM EX1, 165mm, 34T Steel Ring
Cassette	SRAM XS 1275 Transmission, T-Type, 10-52T
Chain	SRAM GX Eagle Transmission, T-Type

Brakes

Brakes	SRAM Maven Base; Rotors: SRAM Centerline 220mm, 6-Bolt

Cockpit & contact points

Headset	Cane Creek 50, ZS56/ZS56
Handlebar	Blackbird 35 Aluminum Riser Bar 800mm
Stem	Blkbrd Stemsm-MD: 35mm, XM-XL: 50mm
Saddle	WTB Silverado Fusion CrMo 142
Seatpost	KS Vantage Dropper, 34.9mmSM–MD: 140–170mmXM–XL: 180–210mm

Wheels & tires

Wheels	Blackbird Send Alloy, 32H, Blackbird HubsF: Send I, 29 / R: Send II, 29
Front tire	Maxxis Assegai 29x2.5 EXO
Rear tire	Maxxis DHR2 29x2.5 EXO+
Wheel size	Size SM–XL: 29” wheels (MX or 29” option in all sizes via modular dropout system)

Geometry · SM

Seat tube	381 mm
Top tube	579 mm
Head tube	99 mm
Head-tube angle	63.9°
Seat-tube angle	77.7°
Chainstay / rear center	456 mm
Wheelbase	1227 mm
Bottom-bracket drop	44 mm
Bottom-bracket height	329 mm
Reach	445 mm
Stack	614 mm
Standover height	684 mm
Crank length	160 mm
Wheel size	29

Geometry · MD

Seat tube	381 mm
Top tube	604 mm
Head tube	109 mm
Head-tube angle	64.7°
Seat-tube angle	77.7°
Chainstay / rear center	456 mm
Wheelbase	1246 mm
Bottom-bracket drop	41 mm
Bottom-bracket height	332 mm
Reach	467 mm
Stack	625 mm
Standover height	697 mm
Crank length	160 mm
Wheel size	29

Geometry · XM

Seat tube	405 mm
Top tube	624 mm
Head tube	121 mm
Head-tube angle	64.4°
Seat-tube angle	77.9°
Chainstay / rear center	457 mm
Wheelbase	1276 mm
Bottom-bracket drop	41 mm
Bottom-bracket height	332 mm
Reach	489 mm
Stack	634 mm
Standover height	722 mm
Crank length	160 mm
Wheel size	29

Geometry · LG

Seat tube	432 mm
Top tube	646 mm
Head tube	136 mm
Head-tube angle	64.4°
Seat-tube angle	78.4°
Chainstay / rear center	457 mm
Wheelbase	1307 mm
Bottom-bracket drop	38 mm
Bottom-bracket height	335 mm
Reach	513 mm
Stack	644 mm
Standover height	733 mm
Crank length	160 mm
Wheel size	29

Geometry · XL

Seat tube	450 mm
Top tube	665 mm
Head tube	152 mm
Head-tube angle	64.4°
Seat-tube angle	78.9°
Chainstay / rear center	457 mm
Wheelbase	1338 mm
Bottom-bracket drop	35 mm
Bottom-bracket height	338 mm
Reach	536 mm
Stack	656 mm
Standover height	750 mm
Crank length	160 mm
Wheel size	29

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 23, 2026.