Polygon Siskiu D5

2021 MountainTrail Manufacturer page

Last known price: $1,249

Prices shown first for United States
Travel: 100 / 120 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 1 × 9 36t / 11–36t
Gear range: 327%
Weight: 17.03 kg 37.5 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 152.5–165
MD 162.5–175
LG 172.5–185

Components

14 of 19 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

ALX XC 120MM TRAVEL (27.5”) TAPER H/T QR BOOST Not identified

Suspension

2 parts

Drivetrain

7 parts

Bottom bracket

INCLUDE CRANKSET Not identified
Cassette
- Shimano CS-HG200 11–36t
CS-HG200
Chain
- KMC X9 9 speeds
Chain guide

None
Crankset
- Shimano FC-MT210-2 9 speeds 36t
FC-MT210FC-MT2102
Rear derailleur
- Shimano Alivio RD-M3100 9 speeds
RD-M3100
Shifters
- Shimano Alivio SL-M3100
SL-M3100

Brakes

3 parts

Wheels and tires

2 parts

Rims

ALLOY DOUBLE WALL 32H Not identified
Tires

SPIDERBAIT TIRE 27.5"x2.25" Not identified

Cockpit and contact points

6 parts

Handlebar
- Entity
Headset

ZS 44/28.6 | ZS 56/40 Not identified
Pedals

None
Saddle
- Entity
Seatpost
- Entity
Stem
- Entity

Sizes and geometry

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 445mm

Stack 580mm

Wheelbase 1157mm

Head angle 67.0°

Seat angle 75.5°

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 3 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	425	445	465
Stackmm	571.2	580.4	589.6
Top tube lengthmm	572.7	595.1	617.5
Seat tube lengthmm	395	435	485
Head tube lengthmm	102	105	122
Head tube angle	67°	67°	67°
Seat tube angle	75.5°	75.5°	75.5°
Chainstay lengthmm	432	432	432
Wheelbasemm	1133	1157	1181
Front centermm	702	726	750
Bottom bracket dropmm	27	27	27
Bottom bracket heightmm	326	326	326
Standover heightmm	676	696	729
Fork rakemm	42	42	42
Trailmm	105	105	105
Stack/reach ratio	1.34	1.30	1.27

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: Aluminum
Bicycle weight: 17.03 kg

37.5 lb

Suspension

Suspension configuration: Full suspension
Front travel: 100 mm
Rear travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 27.5 in
Highest gear: 90.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Coil
Tire width: 2.25″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

4 measures

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

Front travel

100 mm

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,325 bicycles with this information
Coverage: 98.1% of the class

Lowest gear

27.5 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,138 bicycles with this information
Coverage: 84.2% of the class

Highest gear

90.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,138 bicycles with this information
Coverage: 84.2% of the class

Shifting

Mechanical

53 of 1,347 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,347 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.5 km/h
Highest gear: 34.5 km/h

Total gear range 327%

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: 27.5–90.0 gear inches
Class reference (p10–p90): 16.9–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2021
Lowest gear: 1138 bicycles with this information, 84.2% of the class
Highest gear: 1138 bicycles with this information, 84.2% 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 2021 builds
Specification	This bicycle Polygon Siskiu D5	Polygon Siskiu D24	Polygon Siskiu D24X	Polygon Siskiu D7	Polygon Siskiu N7	Polygon Siskiu N7 Dual Suspension
Frame
Bicycle weight	17.03 kg	13.79 kg	13.61 kg	16.35 kg	16.8 kg	16.8 kg
Suspension
Front travel	100 mm	120 mm	120 mm	120 mm	160 mm	170 mm
Rear travel	120 mm	120 mm	120 mm	120 mm	160 mm	160 mm
Drivetrain
Smallest chainring	36	30	32	32	32	32
Largest chainring	36	30	32	32	32	32
Rear sprockets	9	8	10	11	12	12
Smallest sprocket	11	12	11	11	10	10
Largest sprocket	36	42	46	51	51	51
Lowest gear	27.5 in	17.1 in	16.7 in	18.2 in	18.2 in	17.3 in
Highest gear	90.0 in	60.0 in	69.8 in	84.4 in	92.8 in	88.0 in
Brakes
Brake type	Hydraulic disc	Mechanical disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc
Cockpit
Seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Fork spring	Coil	Air	Air	Not informed	Air	Air
Tire width	2.25″	2.4″	2.4″	2.25″	2.6″	2.6″
Wheel size	27.5″	24″	24″	27.5″ / 29″	27.5″ / 29″	27.5″
Bottom bracket standard	Not informed	BSA	BSA	Not informed	BSA	BSA