ARC8 Extra ST Fox Factory XT

2024 MountainEnduro Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €4,999 Last known price
Fork travel: 160 mm
Wheels: 29″
Drivetrain: 1 × 12 32t / 10–51t
Gear range: 510%
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM Not informed
MD 173–182
LG 182+

Components

17 of 18 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

ARC8 EXTRA ST, carbon Not identified

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket
- Shimano BB-MT800
BB-MT800
Cassette
- Shimano Deore XT CS-M8100-12 12 speeds 10–51t
CS-M8100-12CS-M8100
Chain
- Shimano Deore XT CN-M8100
CN-M8100
Crankset
- Shimano Deore XT FC-M8120 12 speeds 32t
FC-M8120
Rear derailleur
- Shimano Deore XT RD-M8100-SGS 12 speeds
RD-M8100-SGSRD-M8100
Shifters
- Shimano Deore XT SL-M8100
SL-M8100

Brakes

1 part

Brakes
- Shimano Deore XT BR-M8120
- Shimano Deore XT BL-M8100
BR-M8120BL-M8100

Wheels and tires

2 parts

Cockpit and contact points

6 parts

Sizes and geometry

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 472mm

Stack 600mm

Wheelbase 1221mm

Head angle 64.7°

Seat angle 76.7°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 3 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	447	472	497
Stackmm	591	600	609
Top tube lengthmm	560	617	645
Seat tube lengthmm	380	400	440
Head tube lengthmm	90	100	110
Head tube angle	64.7°	64.7°	64.7°
Seat tube angle	76.7°	76.7°	76.7°
Chainstay lengthmm	430	430	430
Wheelbasemm	1192	1221	1250
Front centermm	764	793	822
Bottom bracket dropmm	35	35	35
Bottom bracket heightmm	339	339	339
Standover heightmm	682	684	682
Fork rakemm	42	42	42
Trailmm	124	124	124
Stack/reach ratio	1.32	1.27	1.23

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: 2.2 kg

4.9 lb

Suspension

Suspension configuration: Full suspension
Front travel: 160 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 18.2 in
Highest gear: 92.8 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: 29″

Technical analysis

2 measures

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

Front travel

160 mm

This value is within the central range for this class.

Cohort: Mountain / Enduro Model year: 2024
Sample: 1,580 bicycles with this information
Coverage: 98.0% of the class

Shifting

Mechanical

440 of 1,611 bicycles with this information use electronic shifting.

Cohort: Mountain / Enduro Model year: 2024
Sample: 1,611 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.0 km/h
Highest gear: 35.5 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: 18.2–92.8 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

Differences across 2024 builds
Specification	This bicycle ARC8 Extra ST Fox Factory XT	ARC8 Extra Air Fox Factory	ARC8 Extra Air Fox Factory GX AXS	ARC8 Extra Air Fox Factory XTR	ARC8 Extra Air Fox Performance	ARC8 Extra Air Fox Performance XT
Frame
Frame weight	2.2 kg	0.55 kg	Not informed	Not informed	0.55 kg	0.55 kg
Bicycle weight	Not informed	Not informed	13.4 kg	12.8 kg	Not informed	Not informed
Suspension
Rear travel	Not informed	160 mm	160 mm	160 mm	160 mm	160 mm
Drivetrain
Rear sprockets	12	12	12	Not informed	Not informed	Not informed
Largest sprocket	51	52	52	51	51	51
Lowest gear	18.2 in	17.9 in	17.9 in	18.2 in	18.2 in	18.2 in
Cockpit
Shifting	Mechanical	Electronic	Electronic	Mechanical	Mechanical	Mechanical
Derailleur hanger	Not informed	UDH	UDH	Not informed	Not informed	Not informed
Other specifications
Wheel material	Aluminum	Aluminum	Aluminum	Carbon	Aluminum	Aluminum