Polygon Siskiu D24

2025 YouthMountain youth Manufacturer page

Last known price: $949

Prices shown first for United States
Travel: 120 / 120 mm Fork / rear shock
Wheels: 24″
Drivetrain: 1 × 8 30t / 12–42t
Gear range: 350%
Weight: 13.8 kg 30.4 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

All Size 127–142

Components

14 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

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket

2PCS W/ CARTRIDGE SEALED BEARING & 126,5mm SQUARE AXLE Not identified
Cassette
- microSHIFT Acolyte 12–42t
CS-H083
Chain
- KMC X9 9 speeds
Crankset
- Prowheel 30t
Rear derailleur
- microSHIFT Acolyte Medium Cage SpringLock 8 speeds
RD-M5185M
Shifters
- microSHIFT Acolyte Xpress Shifter 1×8 Indicator 8 speeds
SL-M7180

Brakes

3 parts

Wheels and tires

5 parts

Front hub

SOLON DH909TF 15x100mm 32H 6B Not identified
Rear hub

SOLON DH909TR 12x142mm 32H 6B FOR CASSETTE SPROCKET Not identified
Rims

ALLOY DOUBLE WALL H:22mm W: 24mm 507-24 32H FOR TYRE 507-62 Not identified
Spokes

F: 14G STAINLESS NDS:232mm DS:232mm W/ 12mm BRASS NIPPLE / R: 14G STAINLESS NDS:232mm DS:230mm W/ 12mm BRASS NIPPLE Not identified
Tires
- Vee Tire

Cockpit and contact points

6 parts

Handlebar
- Polygon
Headset

ZERO STACK W/ SEALED BEARING, ZS 44/28.6 | ZS 56/30 Not identified
Pedals

ONE PIECE PP BODY Not identified
Saddle

BLACK, STEEL ø7mm Not identified
Seatpost
- Polygon
Stem
- Entity

Sizes and geometry

1 size Open in the geometry plotter

Enter your height to highlight matching ranges.

Size All Size

Table

Reach 350mm

Stack 534mm

Wheelbase 1053mm

Head angle 66.0°

Seat angle 75.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 24″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	350
Stackmm	534
Top tube lengthmm	493.1
Seat tube lengthmm	317
Head tube lengthmm	90
Head tube angle	66°
Seat tube angle	75°
Chainstay lengthmm	425
Wheelbasemm	1053
Front centermm	628
Bottom bracket dropmm	10
Bottom bracket heightmm	338
Standover heightmm	633
Fork rakemm	41
Stack/reach ratio	1.53
Suspension and parts
Front travelmm	120
Crank lengthmm	140

Not published by the manufacturer: Trail, Rear travel, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Bicycle weight: 13.8 kg

30.4 lb

Suspension

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

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 8
Smallest sprocket: 12
Largest sprocket: 42
Lowest gear: 17.1 in
Highest gear: 60.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Tire clearance: Maximum tire width: 2.5″
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 24″

Technical analysis

3 measures

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

Lowest gear

17.1 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2025
Sample: 257 bicycles with this information
Coverage: 70.0% of the class

Highest gear

60.0 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2025
Sample: 257 bicycles with this information
Coverage: 70.0% of the class

Shifting

Mechanical

10 of 367 bicycles with this information use electronic shifting.

Cohort: Youth / Mountain youth Model year: 2025
Sample: 367 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.6 km/h
Highest gear: 23.0 km/h

Total gear range 350%

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: 17.1–60.0 gear inches
Class reference (p10–p90): 14.0–80.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2025
Lowest gear: 257 bicycles with this information, 70.0% of the class
Highest gear: 257 bicycles with this information, 70.0% 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 2025 builds
Specification	This bicycle Polygon Siskiu D24	Polygon Siskiu D24 EVO	Polygon Siskiu D5	Polygon Siskiu D6	Polygon Siskiu D6 SE	Polygon Siskiu D7
Frame
Bicycle weight	13.8 kg	13.6 kg	Not informed	Not informed	Not informed	Not informed
Drivetrain
Smallest chainring	30	30	32	32	32	32
Largest chainring	30	30	32	32	32	32
Rear sprockets	8	10	9	10	10	11
Smallest sprocket	12	11	11	11	10	11
Largest sprocket	42	48	46	48	42	50
Lowest gear	17.1 in	15.0 in	19.1 in	19.3 in	22.1 in	18.6 in
Highest gear	60.0 in	65.5 in	80.0 in	84.4 in	92.8 in	84.4 in
Cockpit
Seatpost	Rigid seatpost	Dropper seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Fork spring	Air	Air	Coil	Coil	Coil	Air
Tire clearance	Maximum tire width: 2.5″	Maximum tire width: 2.4″	Maximum tire width: 2.25″	Not informed	Not informed	Maximum tire width: 2.4″
Tire width	2.4″	2.4″	2.25″	2.25″	2.25″	2.25″
Wheel size	24″	24″	27.5″	27.5″ / 29″	27.5″ / 29″	27.5″ / 29″
Bottom bracket standard	Not informed	BSA	BSA	BSA	BSA	BSA