Otso Arctodus 1x12 Shimano XT M8100

2024 MountainFat bike Manufacturer page

Last known price: $2,525

Prices shown first for United States
Wheels: 27.5″
Drivetrain: 1 × 12 30t / 10–51t
Gear range: 510%
Frame: Steel
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 144.8–167
MD 164–177
LG 174–187
XL 184–200.7

Components

6 of 14 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

Chromoly with Tuning Chip™️ dropout system Not identified

Drivetrain

3 parts

Bottom bracket

100mm BSA threaded Not identified
Cassette
- Shimano Deore XT CS-M8100 12 speeds 10–51t
CS-M8100
Crankset

30T Round Not identified

Brakes

2 parts

Brakes
- Shimano Deore
BR-M4100
Disc rotors

74mm post (160mm native, 180mm max) Not identified

Wheels and tires

2 parts

Rims

Fat: Lithic Cryolite 100mm 26" with Lithic Hubs Not identified
Tires
- Schwalbe Al Mighty

Cockpit and contact points

6 parts

Grips
- Wolf Tooth
Handlebar

Aluminum 31.8 x 780mm, 20mm rise Not identified
Headset

ZS44 upper, EC44 lower Not identified
Saddle
- WTB Silverado
Seatpost
- FSA SL-K SB0
Stem

Aluminum - 50mm +/- 7 deg Not identified

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Geometry diagram unavailable

The drawing needs seat tube angle, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	415	435	455	475
Stackmm	607	607	617	635
Top tube lengthmm	589	610	632	657
Seat tube lengthmm	380	420	465	510
Head tube lengthmm	90	90	100	120
Head tube angle	68.5°	68.5°	68.5°	68.5°
Chainstay lengthmm	440	440	440	440
Wheelbasemm	1119	1140	1162	1189
Front centermm	691	712	734	761
Bottom bracket dropmm	80	80	80	80
Bottom bracket heightmm	275	275	275	275
Standover heightmm	707	736	773	810
Fork rakemm	51	51	51	51
Trailmm	94	94	94	94
Stack/reach ratio	1.46	1.40	1.36	1.34

Not published by the manufacturer: Seat tube angle, Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Steel
Frame weight: 3.41 kg

7.5 lb
Weight limit: 124.74 kg

275.0 lb

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 16.2 in
Highest gear: 82.5 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Tire width: 4.8″
Wheel material: Aluminum
Wheel size: 27.5″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.2 km/h
Highest gear: 31.6 km/h

Total gear range 510%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 16.2–82.5 gear inches

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2024 builds
Specification	This bicycle Otso Arctodus 1x12 Shimano XT M8100	Otso Arctodus 1x12 Shimano SLX M7100	Otso Arctodus 1x12 SRAM GX Eagle	Otso Arctodus 1x12 SRAM GX Eagle AXS	Otso Arctodus 1x12 SRAM X01 Eagle AXS	Otso Arctodus SLX
Frame
Frame weight	3.41 kg	3.41 kg	3.41 kg	3.41 kg	3.41 kg	Not informed
Fork material	Not informed	Not informed	Not informed	Not informed	Not informed	Carbon
Bicycle weight	Not informed	Not informed	Not informed	Not informed	Not informed	15.6 kg
Suspension
Suspension configuration	Not informed	Not informed	Not informed	Not informed	Not informed	Rigid
Drivetrain
Smallest chainring	30	30	28	28	28	30
Largest chainring	30	30	28	28	28	30
Largest sprocket	51	51	52	52	52	51
Lowest gear	16.2 in	16.2 in	14.8 in	14.8 in	14.8 in	15.3 in
Highest gear	82.5 in	82.5 in	77.0 in	77.0 in	77.0 in	78.0 in
Other specifications
Wheel size	27.5″	27.5″	27.5″	27.5″	27.5″	26″
Suspension	Not informed	Not informed	Not informed	Not informed	Not informed	Rigid
Travel	Not informed	Not informed	Not informed	Not informed	Not informed	Configuration: Rigid