Polygon Siskiu D6 LTD

Name: Polygon Siskiu D6 LTD
Brand: Polygon

2026 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 × 10 24t / 11–48t
Gear range: 436%
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

13 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 Aluminum Frame, 120mm Travel, BSA Threaded 73mm Bottom Bracket, 12x148mm Thru Axle, Tapered Head Tube Not identified

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket

BSA, 73mm, threaded Not identified
Cassette
- Shimano CS-LG300-10 10 speeds 11–48t
CS-LG300-10CS-LG300
Chain
- KMC
Crankset

32T Single Chainring, Maximum 36T Single or 36/24T Double Not identified
Rear derailleur
- Shimano Cues RD-U6000 11 speeds
RD-U6000
Shifters
- Shimano Cues SL-U6000
SL-U6000

Brakes

2 parts

Brakes
- Shimano BR-MT200
BR-MT200
Disc rotors
- Shimano SM-RT10
SM-RT10

Wheels and tires

4 parts

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

Deli Tire SA-290, 27.5x2.25" Not identified

SA-290

Cockpit and contact points

6 parts

Handlebar
- Polygon
Headset

Zero Stack Sealed Bearing Headset, ZS 44/28.6 | ZS 56/30 Not identified
Pedals

One-Piece PP Pedals Not identified
Saddle

Linc Void Saddle, Steel Ø7mm Rails Not identified
Seatpost

TransX JD-YSP23KL Dropper post, 150mm Travel, 30.9x459mm, 0mm Offset Not identified

JD-YSP23KL
Stem
- Polygon

Sizes and geometry

2 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size SM

Table

Reach 425mm

Stack 571mm

Wheelbase 1133mm

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 Reach Stack

Complete manufacturer geometry table 2 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	425	445
Stackmm	571.2	580.4
Top tube lengthmm	572.7	595.1
Seat tube lengthmm	395	435
Head tube lengthmm	102	105
Head tube angle	67°	67°
Seat tube angle	75.5°	75.5°
Chainstay lengthmm	432	432
Wheelbasemm	1133	1157
Front centermm	702	726
Bottom bracket dropmm	27	27
Bottom bracket heightmm	326	326
Standover heightmm	676	696
Fork rakemm	42	42
Trailmm	105	105
Stack/reach ratio	1.34	1.30
Suspension and parts
Front travelmm	120	120
Rear travelmm	120	120
Crank lengthmm	170	170
Handlebar widthmm	760	760
Stem lengthmm	40	45
Dropper post travelmm	150	150

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: 24
Largest chainring: 24
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 48
Lowest gear: 13.8 in
Highest gear: 60.0 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: 2026
Sample: 1,644 bicycles with this information
Coverage: 96.3% of the class

Lowest gear

13.8 gear inches

This value is below 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

60.0 gear inches

This value is below 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: 5.3 km/h
Highest gear: 23.0 km/h

Total gear range 436%

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: 13.8–60.0 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

Differences across 2026 builds
Specification	This bicycle Polygon Siskiu D6 LTD	Polygon Siskiu D24	Polygon Siskiu D5	Polygon Siskiu D6	Polygon Siskiu D7	Polygon Siskiu DSE
Suspension
Front travel	120 mm	120 mm	120 mm	120 mm	120 mm	Not informed
Rear travel	120 mm	120 mm	120 mm	120 mm	Not informed	Not informed
Drivetrain
Smallest chainring	24	30	32	32	32	32
Largest chainring	24	30	32	32	32	32
Rear sprockets	10	8	9	10	11	11
Smallest sprocket	11	12	11	11	11	11
Largest sprocket	48	42	46	48	50	51
Lowest gear	13.8 in	17.1 in	19.1 in	19.3 in	18.6 in	18.2 in
Highest gear	60.0 in	60.0 in	80.0 in	84.4 in	84.4 in	84.4 in
Cockpit
Seatpost	Dropper seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Bottom bracket standard	BSA	Not informed	BSA	BSA	BSA	BSA
Fork spring	Air	Air	Coil	Coil	Air	Air
Tire clearance	Maximum tire width: 2.4″	Maximum tire width: 2.5″	Maximum tire width: 2.25″	Not informed	Not informed	Not informed
Tire width	2.25″	2.4″	2.25″	2.25″	2.25″	2.25″
Wheel size	27.5″	24″	27.5″	27.5″ / 29″	27.5″ / 29″	29″