Polygon Siskiu D7 SE

Name: Polygon Siskiu D7 SE
Brand: Polygon

2025 MountainTrail Manufacturer page

Last known price: $1,699

Prices shown first for United States
Travel: 120 / 120 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 1 × 11 32t / 11–51t
Gear range: 464%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

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

Components

15 of 21 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 Trail 6061 Alloy Frame, 120mm Travel, Internal Routed Gear & Dropper Cables, Tapered Headtube, 73mm Threaded Boost BB, 148x12mm Boost Thru-Axle Not identified

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket

BSA, 73mm, threaded Not identified
Cassette
- Shimano Deore CS-M5100-11 11 speeds 11–51t
CS-M5100-11CS-M5100
Chain
- KMC X11 11 speeds
Crankset

32T Not identified
Rear derailleur
- Shimano Deore RD-M5100 11 speeds
RD-M5100
Shifters
- Shimano Deore SL-M5100
SL-M5100

Brakes

2 parts

Brakes
- Shimano
BR-M201
Disc rotors
- Shimano SM-RT30
SM-RT30

Wheels and tires

4 parts

Front hub

Solon DH919TF, Thru Axle, 15x100mm,32H, Centerlock Not identified
Rear hub

Solon DH943TR,Thru Axle, 12x148mm, 32H Centerlock Not identified
Rims
- Entity
Tires
- Schwalbe Nobby Nic

Cockpit and contact points

6 parts

Grips
- Entity
Handlebar
- Entity
Headset

Threadless Tapered Zero Stack; ZS 44/28.6 | ZS 56/40 Not identified
Saddle
- Entity
Seatpost
- Tranz-X
Stem
- Entity

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 445mm

Stack 607mm

Wheelbase 1165mm

Head angle 67.0°

Seat angle 76.0°

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 5 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	425	445	445	465	485
Stackmm	571	580	607	616	625
Top tube lengthmm	572	595	603	624	646
Seat tube lengthmm	395	435	435	487	522
Head tube lengthmm	102	105	102	112	122
Head tube angle	67°	67°	67°	67°	67°
Seat tube angle	75°	75°	76°	76°	76°
Chainstay lengthmm	432	432	436	436	436
Wheelbasemm	1133	1157	1165	1189	1213
Front centermm	702	726	733	757	781
Bottom bracket dropmm	27	27	47	47	47
Bottom bracket heightmm	326	326	326	326	326
Standover heightmm	676	696	698	733	761
Fork rakemm	42	42	45	45	45
Trailmm	105	105	102	102	102
Stack/reach ratio	1.34	1.30	1.36	1.33	1.29
Suspension and parts
Front travelmm	120	120	120	120	120
Rear travelmm	120	120	120	120	120
Crank lengthmm	170	170	170	170	170
Handlebar widthmm	760	760	760	760	760
Stem lengthmm	45	45	45	45	45
Dropper post travelmm	150	150	170	170	170

Not published by the manufacturer: Stem angle and Seatpost length.

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: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 11
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 clearance: Maximum tire width: 2.4″
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: 2025
Sample: 1,810 bicycles with this information
Coverage: 97.5% of the class

Lowest gear

17.3 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Highest gear

80.0 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Shifting

Mechanical

388 of 1,849 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,849 bicycles with this information
Coverage: 99.6% 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): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2025
Lowest gear: 1384 bicycles with this information, 74.6% of the class
Highest gear: 1384 bicycles with this information, 74.6% 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 2025 builds
Specification	This bicycle Polygon Siskiu D7 SE	Polygon Siskiu D24	Polygon Siskiu D24 EVO	Polygon Siskiu D5	Polygon Siskiu D6	Polygon Siskiu D6 SE
Frame
Bicycle weight	Not informed	13.8 kg	13.6 kg	Not informed	Not informed	Not informed
Drivetrain
Smallest chainring	32	30	30	32	32	32
Largest chainring	32	30	30	32	32	32
Rear sprockets	11	8	10	9	10	10
Smallest sprocket	11	12	11	11	11	10
Largest sprocket	51	42	48	46	48	42
Lowest gear	17.3 in	17.1 in	15.0 in	19.1 in	19.3 in	22.1 in
Highest gear	80.0 in	60.0 in	65.5 in	80.0 in	84.4 in	92.8 in
Cockpit
Seatpost	Dropper seatpost	Rigid seatpost	Dropper seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Bottom bracket standard	BSA	Not informed	BSA	BSA	BSA	BSA
Fork spring	Air	Air	Air	Coil	Coil	Coil
Tire clearance	Maximum tire width: 2.4″	Maximum tire width: 2.5″	Maximum tire width: 2.4″	Maximum tire width: 2.25″	Not informed	Not informed
Tire width	2.25″	2.4″	2.4″	2.25″	2.25″	2.25″
Wheel size	27.5″	24″	24″	27.5″	27.5″ / 29″	27.5″ / 29″

Changes since 2024
Specification	2024 Polygon Siskiu D7 SE	This bicycle Polygon Siskiu D7 SE
Frame
Bicycle weight	15.7 kg	Not informed
Drivetrain
Largest sprocket	50	51
Lowest gear	18.6 in	17.3 in
Highest gear	84.4 in	80.0 in
Other specifications
Wheel size	29″	27.5″