Otso Voytek 2 1x12 Shimano XT M8100

2026 MountainFat bike Manufacturer page

Last known price: $4,325

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

Rider height by size (cm)

Size guide

SM 144.8–167.6
MD 165.1–177.8
LG 175.3–188
XL 185.4–203.2

Components

5 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

Carbon, Tuning Chip® dropout system, GeoChip Head Tube system Not identified

Drivetrain

3 parts

Bottom bracket
- Race Face
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
- Sun Ringlé
Tires

45NRTH Vanhelga, 26x4.2, 120 tpi, black OR 45NRTH Vanhelga, 27.5x4.0, 120 tpi, black Not identified

Cockpit and contact points

6 parts

Grips

Fat Paw - Black Not identified
Handlebar

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

IS41 upper, IS52 lower Not identified
Saddle
- WTB Silverado
Seatpost

Aluminum 31.6 x 400mm, 8mm offset Not identified
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

Reach 454mm

Stack 595mm

Wheelbase 1174mm

Head angle 67.8°

Seat angle 73.8°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	433	454	467	487
Stackmm	581	595	619	637
Top tube lengthmm	600	625	645	670
Seat tube lengthmm	380	420	465	510
Head tube lengthmm	95	110	136	156
Head tube angle	67.8°	67.8°	67.8°	67.8°
Seat tube angle	73.8°	73.8°	73.8°	73.8°
Chainstay lengthmm	450	450	450	450
Wheelbasemm	1148	1174	1197	1224
Front centermm	705	731	754	781
Bottom bracket dropmm	63	63	63	63
Bottom bracket heightmm	292	292	292	292
Standover heightmm	691	724	764	801
Fork rakemm	51	51	51	51
Trailmm	93	93	93	93
Stack/reach ratio	1.34	1.31	1.33	1.31

Not published by the manufacturer: 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: Carbon
Frame weight: 1.45 kg

3.2 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

Derailleur hanger: UDH
Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BB86/BB92
Tire clearance: Maximum tire width: 4.6″
Tire width: 4.2″
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 2026 builds
Specification	This bicycle Otso Voytek 2 1x12 Shimano XT M8100	Otso Voytek 2 1x12 Shimano SLX M7100	Otso Voytek 2 1x12 SRAM GX Eagle	Otso Voytek 2 1x12 SRAM GX Eagle AXS	Otso Voytek 2 1x12 SRAM GX Eagle Mechanical	Otso Voytek 2 1x12 SRAM X01 Eagle AXS
Drivetrain
Smallest chainring	30	30	28	28	28	28
Largest chainring	30	30	28	28	28	28
Largest sprocket	51	51	52	52	52	52
Lowest gear	16.2 in	16.2 in	14.8 in	14.8 in	14.8 in	14.8 in
Highest gear	82.5 in	82.5 in	77.0 in	77.0 in	77.0 in	77.0 in
Brakes
Brake type	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Mechanical disc	Hydraulic disc