Alchemy Arktos 27.5 XTR

2020 MountainEnduro Manufacturer page

Last known price: $9,499

Prices shown first for United States
Travel: 170 / 152 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 1 × 12 32t / 11–51t
Gear range: 464%
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–170
MD 165.1–177.8
LG 175.3–188
XL 180.3–195.6

Components

17 of 17 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.

Suspension

2 parts

Fork
- Fox 36
Rear shock
- Fox

Drivetrain

6 parts

Bottom bracket
- Shimano
Cassette
- Shimano XTR CS-M9100-12 11–51t
CS-M9100-12
Chain
- Shimano XTR CN-M9100
CN-M9100
Crankset
- Shimano XTR FC-M9100-1 12 speeds 32t
FC-M9100
Rear derailleur
- Shimano XTR RD-M9120-SGS
RD-M9120-SGS
Shifters
- Shimano XTR SL-M9100
SL-M9100

Brakes

2 parts

Wheels and tires

2 parts

Cockpit and contact points

5 parts

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 415mm

Stack 599mm

Wheelbase 1171mm

Head angle 65.5°

Seat angle 73.5°

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	401	415	431	448
Stackmm	589	599	604	614
Top tube lengthmm	585	600	615	642
Seat tube lengthmm	420	455	483	518
Head tube lengthmm	100	110	115	130
Head tube angle	65.5°	65.5°	65.5°	65.5°
Seat tube angle	73.5°	73.5°	73.5°	73.5°
Chainstay lengthmm	438	438	438	438
Wheelbasemm	1161	1171	1185	1212
Front centermm	723	733	747	774
Bottom bracket dropmm	10	10	10	10
Bottom bracket heightmm	346	346	346	346
Standover heightmm	756	780	798	826
Fork rakemm	53	45	41	46
Trailmm	104	113	117	111
Stack/reach ratio	1.47	1.44	1.40	1.37

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

Suspension

Suspension configuration: Full suspension
Front travel: 170 mm
Rear travel: 152 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 51
Lowest gear: 17.3 in
Highest gear: 80.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire width: 2.5″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

5 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

170 mm

This value is within the central range for this class.

Cohort: Mountain / Enduro Model year: 2020
Sample: 829 bicycles with this information
Coverage: 98.5% of the class

Rear travel

152 mm

This value is within the central range for this class.

Cohort: Mountain / Enduro Model year: 2020
Sample: 678 bicycles with this information
Coverage: 80.6% of the class

Lowest gear

17.3 gear inches

This value is below the central range for this class.

Cohort: Mountain / Enduro Model year: 2020
Sample: 705 bicycles with this information
Coverage: 83.8% of the class

Highest gear

80.0 gear inches

This value is below the central range for this class.

Cohort: Mountain / Enduro Model year: 2020
Sample: 705 bicycles with this information
Coverage: 83.8% of the class

Shifting

Mechanical

50 of 841 bicycles with this information use electronic shifting.

Cohort: Mountain / Enduro Model year: 2020
Sample: 841 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.6 km/h
Highest gear: 30.6 km/h

Total gear range 464%

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: 17.3–80.0 gear inches
Class reference (p10–p90): 17.3–93.5 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Enduro Model year: 2020
Lowest gear: 705 bicycles with this information, 83.8% of the class
Highest gear: 705 bicycles with this information, 83.8% of the class

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 2020 builds
Specification	This bicycle Alchemy Arktos 27.5 XTR	Alchemy Arktos 27.5 GX Eagle	Alchemy Arktos 27.5 NX Eagle	Alchemy Arktos 27.5 X01 Eagle	Alchemy Arktos 27.5 XT 12 speed	Alchemy Arktos 29 GX Eagle
Suspension
Front travel	170 mm	170 mm	170 mm	170 mm	170 mm	160 mm
Rear travel	152 mm	152 mm	152 mm	152 mm	152 mm	140 mm
Drivetrain
Smallest sprocket	11	10	11	10	10	10
Largest sprocket	51	50	50	50	51	50
Lowest gear	17.3 in	17.6 in	17.6 in	17.6 in	17.3 in	18.6 in
Highest gear	80.0 in	88.0 in	80.0 in	88.0 in	88.0 in	92.8 in
Other specifications
Wheel size	27.5″	27.5″	27.5″	27.5″	27.5″	29″