Polygon Siskiu D24 EVO

Name: Polygon Siskiu D24 EVO
Brand: Polygon

2025 YouthMountain youth Manufacturer page

Last known price: $1,699

Prices shown first for United States
Travel: 120 / 120 mm Fork / rear shock
Wheels: 24″
Drivetrain: 1 × 10 30t / 11–48t
Gear range: 436%
Weight: 13.6 kg 30.0 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

One Size 127–149.9

Components

14 of 19 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 Kids 6061 Aluminum Frame, 120mm Travel, Internal Routed Gear & Dropper Cables, Tapered Headtube, 73mm Threaded BB, ISCG05 Chain Guide, 142x12mm Thru-Axle Not identified

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket

BSA, 73mm, threaded Not identified
Cassette
- Shimano CS-LG300 11–48t
CS-LG300
Chain
- Shimano CN-LG500
CN-LG500
Crankset
- Prowheel 30t
Rear derailleur
- Shimano Cues RD-U6000 11 speeds
RD-U6000
Shifters
- Shimano Cues
SL-U600

Brakes

1 part

Brakes
- Tektro HD-J285
HD-J285

Wheels and tires

4 parts

Front hub

Solon DH909TF, 15x100mm Thru-Axle, 6 bolt, 32H Not identified
Rear hub

Solon DH909TR, 12x142mm Thru-Axle, 6 bolt, 32H Not identified
Rims
- Polygon
Tires
- Vee Tire

Cockpit and contact points

5 parts

Handlebar
- Entity
Pedals

Included Not identified
Saddle
- Entity
Seatpost
- Tranz-X
JD-YSP23JL
Stem
- Entity

Sizes and geometry

1 size Open in the geometry plotter

Enter your height to highlight matching ranges.

Size One Size

Table

Reach 350mm

Stack 534mm

Wheelbase 1028mm

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	534.1
Top tube lengthmm	493.1
Seat tube lengthmm	317
Head tube lengthmm	90
Head tube angle	66°
Seat tube angle	75°
Chainstay lengthmm	400
Wheelbasemm	1028.2
Front centermm	628
Bottom bracket dropmm	10
Bottom bracket heightmm	303.5
Standover heightmm	598.4
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: 13.6 kg

30.0 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: 10
Smallest sprocket: 11
Largest sprocket: 48
Lowest gear: 15.0 in
Highest gear: 65.5 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: 2.4″
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

15.0 gear inches

This value is below 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

65.5 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: 5.7 km/h
Highest gear: 25.1 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: 15.0–65.5 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 EVO	Polygon Siskiu D24	Polygon Siskiu D5	Polygon Siskiu D6	Polygon Siskiu D6 SE	Polygon Siskiu D7
Frame
Bicycle weight	13.6 kg	13.8 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	10	8	9	10	10	11
Smallest sprocket	11	12	11	11	10	11
Largest sprocket	48	42	46	48	42	50
Lowest gear	15.0 in	17.1 in	19.1 in	19.3 in	22.1 in	18.6 in
Highest gear	65.5 in	60.0 in	80.0 in	84.4 in	92.8 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	Coil	Air
Tire clearance	Maximum tire width: 2.4″	Maximum tire width: 2.5″	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″