Polygon Siskiu HE (Bosch)

2026 MountainTrail Electric bicycle Manufacturer page

Polygon Siskiu HE (Bosch), color Gloss Purple

Last known price: $4,199

Prices shown first for United States
Fork travel: 130 mm
Wheels: 27.5″
Drivetrain: 1 × 12 38t / 11–50t
Gear range: 455%
Battery: 625 Wh
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 153–165
MD 163–175
LG 173–185
XL 183–195

Components

18 of 23 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

Electric system

2 parts

Suspension

2 parts

Drivetrain

5 parts

Brakes

3 parts

Wheels and tires

5 parts

Front hub
- Shimano HB-TC500
HB-TC500
Rear hub
- Shimano FH-TC500
FH-TC500
Rims

F: ALLOY DOUBLE WALL FV H:18mm 622x36 32H FOR TYRE 622-54/76 W/ TUBELESS TAPE / R: ALLOY DOUBLE WALL FV H:18mm 584x36 32H FOR TYRE 584-54/76 W/ TUBELESS TAPE Not identified
Spokes

F: STAINLESS 14G NDS:294mm DS:296mm W/ 12mm BRASS NIPPLE / R: STAINLESS 14G NDS:276mm DS:274mm W/ 12mm BRASS NIPPLE Not identified
Tires
- Schwalbe

Cockpit and contact points

5 parts

Handlebar
- Polygon
Headset
- FSA
HBS-220
Pedals

ALLOY FLAT W/ REPLACEABLE PIN Not identified
Saddle

EASE, STEEL ø7mm Not identified
Seatpost
- Tranz-X
JD-YSP23JL

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 454mm

Stack 616mm

Wheelbase 1199mm

Head angle 67.8°

Seat angle 76.8°

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	439	454	474	499
Stackmm	612	616	635	635
Top tube lengthmm	577	598	637	656
Seat tube lengthmm	385	400	430	450
Head tube lengthmm	110	110	130	130
Head tube angle	66.8°	67.8°	67.8°	67.8°
Seat tube angle	77.3°	76.8°	75.6°	76.1°
Chainstay lengthmm	457	457	457	457
Wheelbasemm	1194	1199	1226	1251
Front centermm	738	743	770	795
Bottom bracket dropmm	28	28	28	28
Bottom bracket heightmm	353	353	353	353
Standover heightmm	694	697	705	712
Fork rakemm	45	45	45	45
Trailmm	103	96	96	96
Stack/reach ratio	1.39	1.36	1.34	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

Suspension

Suspension configuration: Full suspension
Front travel: 130 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 38
Largest chainring: 38
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 50
Lowest gear: 20.9 in
Highest gear: 95.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Electric system

Battery capacity: 625 Wh

Additional specifications

Battery: BOSCH POWER TUBE 625 HORIZONTAL
Fork spring: Air
Tire width: 2.4″
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

130 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,644 bicycles with this information
Coverage: 96.3% of the class

Lowest gear

20.9 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,229 bicycles with this information
Coverage: 72.0% of the class

Highest gear

95.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,229 bicycles with this information
Coverage: 72.0% of the class

Shifting

Mechanical

389 of 1,706 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,706 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.0 km/h
Highest gear: 36.4 km/h

Total gear range 455%

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: 20.9–95.0 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2026
Lowest gear: 1229 bicycles with this information, 72.0% of the class
Highest gear: 1229 bicycles with this information, 72.0% 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 2026 builds
Specification	This bicycle Polygon Siskiu HE (Bosch)	Polygon Siskiu HE Shimano	Polygon Siskiu HE Shimano Di2	Polygon Siskiu T6E	Polygon Siskiu T7E	Polygon Siskiu TE With Bosch
Suspension
Front travel	130 mm	130 mm	130 mm	140 mm	150 mm	150 mm
Rear travel	Not informed	Not informed	Not informed	140 mm	Not informed	Not informed
Drivetrain
Smallest chainring	38	34	38	34	34	34
Largest chainring	38	34	38	34	34	34
Rear sprockets	12	10	11	11	12	12
Smallest sprocket	11	11	11	Not informed	10	11
Largest sprocket	50	48	50	Not informed	51	50
Lowest gear	20.9 in	19.5 in	20.9 in	Not informed	19.3 in	19.7 in
Highest gear	95.0 in	85.0 in	95.0 in	Not informed	98.6 in	89.6 in
Cockpit
Shifting	Mechanical	Mechanical	Electronic	Mechanical	Mechanical	Mechanical
Electric bicycle systems
Battery capacity	625 Wh	504 Wh	630 Wh	504 Wh	630 Wh	625 Wh
Other specifications
Fork spring	Air	Air	Air	Not informed	Air	Air
Tire width	2.4″	2.4″	2.4″	2.4″	2.6″	2.6″
Wheel size	27.5″	27.5″	27.5″	29″	29″	29″