Polygon Xtrada 20

Name: Polygon Xtrada 20
Brand: Polygon

2025 YouthMountain youth Manufacturer page

Last known price: $799

Prices shown first for United States
Fork travel: 80 mm
Wheels: 20″
Drivetrain: 1 × 9 32t / 11–38t
Gear range: 345%
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

3'9" - 4'3"

The manufacturer did not publish rider heights for these sizes.

Components

11 of 15 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 Junior 20” Aluminium Frame, Quick Release 10x135mm, Threaded 68mm BB Not identified

Suspension

1 part

Fork
- SR Suntour

Drivetrain

6 parts

Bottom bracket

BSA, 68mm, threaded Not identified
Cassette
- microSHIFT ADVENT H-Series 9 Speed Cassette 11-38 9 speeds 11–38t
CS-H093
Chain
- KMC X9 9 speeds
Crankset
- Prowheel 32t
Rear derailleur
- microSHIFT Advent
RD-M6195
Shifters
- microSHIFT ADVENT Quick Trigger Pro Shifter 1×9 9 speeds
SL-M6195R

Brakes

1 part

Brakes
- Tektro HD-J285
HD-J285

Wheels and tires

1 part

Tires

VeetireCo. Crown Gem, 20x2.25” Not identified

Cockpit and contact points

5 parts

Handlebar
- Polygon
Pedals

Included Not identified
Saddle
- Entity
Seatpost
- Entity
Stem
- Entity

Sizes and geometry

1 size Open in the geometry plotter

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

Size 3'9" - 4'3"

Table

Geometry diagram unavailable

The drawing needs head tube length, which the manufacturer did not publish. Available facts remain in the table.

Size Reach Stack

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	310
Stackmm	500
Top tube lengthmm	445
Seat tube lengthmm	308
Head tube angle	66°
Seat tube angle	75°
Chainstay lengthmm	340
Wheelbasemm	912
Front centermm	572
Bottom bracket dropmm	10
Bottom bracket heightmm	259
Standover heightmm	560
Fork rakemm	40
Stack/reach ratio	1.61

Not published by the manufacturer: Head tube length, Trail, 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: Hardtail
Front travel: 80 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 38
Lowest gear: 16.8 in
Highest gear: 58.2 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Coil
Tire width: 2.25″
Wheel size: 20″

Technical analysis

3 measures

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

Lowest gear

16.8 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

58.2 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: 6.5 km/h
Highest gear: 22.3 km/h

Total gear range 345%

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: 16.8–58.2 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 Xtrada 20	Polygon Xtrada 24	Polygon Xtrada 5	Polygon Xtrada 6	Polygon Xtrada 7
Suspension
Front travel	80 mm	80 mm	120 mm	120 mm	120 mm
Drivetrain
Smallest chainring	32	30	32	32	Not informed
Largest chainring	32	30	32	32	Not informed
Rear sprockets	9	10	10	11	12
Smallest sprocket	11	11	Not informed	Not informed	10
Largest sprocket	38	42	Not informed	Not informed	51
Lowest gear	16.8 in	20.7 in	Not informed	Not informed	Not informed
Highest gear	58.2 in	79.1 in	Not informed	Not informed	Not informed
Brakes
Brake type	Hydraulic disc	Mechanical disc	Hydraulic disc	Hydraulic disc	Hydraulic disc
Cockpit
Derailleur hanger	Not informed	Not informed	UDH	Not informed	Not informed
Other specifications
Bottom bracket standard	BSA	Not informed	BSA	BSA	BSA
Fork spring	Coil	Air	Coil	Coil	Air
Wheel size	20″	700c	27.5″ / 29″	27.5″ / 29″	27.5″ / 29″
Wheel material	Not informed	Aluminum	Aluminum	Aluminum	Aluminum
Tire clearance	Not informed	Not informed	Maximum tire width: 2.25″	Maximum tire width: 2.25″	Not informed