Polygon Siskiu D5

2018 MountainTrail

Travel: 120 / 120 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 3 × 9 22–40t / 11–34t
Gear range: 562%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–171
MD 168–180
LG 178–189
XL 186–199

Components

16 of 22 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

Aluminum Not identified

Suspension

2 parts

Drivetrain

8 parts

Bottom bracket

Integrated BSA Not identified
Cassette
- Shimano CS-HG200
CS-HG200
Chain
- KMC X9 9 speeds
X-9
Chain guide

None
Crankset

Two-piece, 170mm length (S/M), 175mm (L/XL) Not identified
Front derailleur
- Shimano Alivio FD-M4000
FD-M4000
Rear derailleur
- Shimano RD-M4000
RD-M4000RD-M4000-DSGS
Shifters
- Shimano Alivio SL-M4000
SL-M4000

Brakes

2 parts

Wheels and tires

4 parts

Front hub

Alloy Not identified
Rear hub

Alloy Not identified
Rims

Araya DM-650 Not identified

DM-650
Tires
- Schwalbe Smart Sam

Cockpit and contact points

6 parts

Handlebar
- Entity
Headset
- FSA
Pedals
- VP VP-195E MTB bike pedal
VP-195E
Saddle
- Entity
Seatpost
- Entity
Stem
- Entity

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 wheelbase and chainstay length, 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	403.4	423.4	445.9	465.9
Stackmm	582.6	582.6	591.8	591.8
Top tube lengthmm	565	585	610	630
Seat tube lengthmm	385	435	485	520
Head tube lengthmm	115	115	125	125
Head tube angle	67.5°	67.5°	67.5°	67.5°
Seat tube angle	74.5°	74.5°	74.5°	74.5°
Bottom bracket dropmm	21	21	21	21
Bottom bracket heightmm	334	334	334	334
Standover heightmm	676.8	703.8	740.6	757.5
Stack/reach ratio	1.44	1.38	1.33	1.27

Not published by the manufacturer: Chainstay length, Wheelbase, Front center, Fork rake, Trail, 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

Suspension

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

Drivetrain

Derived by Bikelake

Front chainrings: 3
Smallest chainring: 22
Largest chainring: 40
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 17.8 in
Highest gear: 100.0 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
Fork spring: Air
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

120 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 925 bicycles with this information
Coverage: 98.6% of the class

Lowest gear

17.8 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 845 bicycles with this information
Coverage: 90.0% of the class

Highest gear

100.0 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 845 bicycles with this information
Coverage: 90.0% of the class

Shifting

Mechanical

25 of 938 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2018
Sample: 938 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.8 km/h
Highest gear: 38.3 km/h

Total gear range 562%

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: 17.8–100.0 gear inches
Class reference (p10–p90): 16.5–93.5 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2018
Lowest gear: 845 bicycles with this information, 90.0% of the class
Highest gear: 845 bicycles with this information, 90.0% 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 2018 builds

Differences across 2018 builds
Specification	This bicycle Polygon Siskiu D5	Polygon Siskiu D6	Polygon Siskiu D7	Polygon Siskiu D8	Polygon Siskiu T7	Polygon Siskiu T8
Suspension
Front travel	120 mm	120 mm	120 mm	120 mm	150 mm	150 mm
Rear travel	120 mm	120 mm	120 mm	120 mm	140 mm	140 mm
Drivetrain
Front chainrings	3	3	2	2	1	1
Smallest chainring	22	22	22	24	32	32
Largest chainring	40	40	36	34	32	32
Rear sprockets	9	10	10	11	10	11
Largest sprocket	34	36	36	42	42	46
Lowest gear	17.8 in	16.8 in	16.8 in	15.7 in	21.0 in	19.1 in
Highest gear	100.0 in	100.0 in	90.0 in	85.0 in	80.0 in	80.0 in
Cockpit
Seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Bottom bracket standard	BSA	BSA	Not informed	BSA	BSA	BSA
Tire width	2.25″	2.25″	2.25″	2.25″	2.6″	2.6″