Polygon Relic 20

Name: Polygon Relic 20
Brand: Polygon

2025 YouthMountain youth Manufacturer page

Last known price: $499

Prices shown first for United States
Fork travel: 40 mm
Wheels: 20″
Drivetrain: 1 × 6 32t / 14–28t
Gear range: 200%
Frame: Aluminum
Brakes: Mechanical disc

Rider height by size (cm)

Size guide

20" 109.2–132.1

Components

7 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

AL6 Alloy Youth, 20" Wheels, IS Seatstay Disc Mount, 135mm Dropouts Not identified

Suspension

1 part

Fork
- Zoom

Drivetrain

5 parts

Cassette
- Shimano Tourney TZ MF-TZ500 14–28t
MF-TZ500
Chain
- KMC
Crankset

Alloy 32T, 140mm Not identified
Rear derailleur
- Shimano Tourney RD-TY21
RD-TY21
Shifters
- Shimano Tourney

Brakes

1 part

Brakes
- Tektro TS325A
TS-325A

Wheels and tires

4 parts

Front hub

Alloy, 32H, QR, 6-Bolt Not identified
Rear hub

Alloy, 32H, QR, 6-Bolt, 135mm Spacing Not identified
Rims

Alloy, Double-Wall, Disc Specific, 32H Not identified
Tires

20x2.1" Not identified

Cockpit and contact points

6 parts

Grips

Slip-on Rubber, L:110mm R:72mm Not identified
Handlebar

560mm, Steel Not identified
Pedals

Kids Specific Nylon Pedal Not identified
Saddle
- Polygon
Seatpost

27.2x300mm, 16mm Offset, Alloy Not identified
Stem

40mm, Steel Not identified

Other components

1 part

Kickstand

Alloy Centre Mount Not identified

Sizes and geometry

1 size Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 20"

Table

Reach 310mm

Stack 441mm

Wheelbase 876mm

Head angle 70.0°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 20″ wheel; exact published values are in the table below. Bottom bracket drop is derived from the published bottom bracket height.

Size Reported by the manufacturer

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	310
Stackmm	441
Top tube lengthmm	445
Seat tube lengthmm	267
Head tube lengthmm	115
Head tube angle	70°
Seat tube angle	73°
Chainstay lengthmm	370
Wheelbasemm	876
Bottom bracket heightmm	252
Standover heightmm	491
Stack/reach ratio	1.42

Not published by the manufacturer: Front center, Bottom bracket drop, Fork rake, 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
Fork material: Aluminum

Suspension

Suspension configuration: Hardtail
Front travel: 40 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 6
Smallest sprocket: 14
Largest sprocket: 28
Lowest gear: 22.9 in
Highest gear: 45.7 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Coil
Tire width: 2.1″
Wheel material: Aluminum
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

22.9 gear inches

This value is above 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

45.7 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

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: 8.8 km/h
Highest gear: 17.5 km/h

Total gear range 200%

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: 22.9–45.7 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 Relic 20	Polygon Relic 24
Suspension
Suspension configuration	Hardtail	Full suspension
Front travel	40 mm	60 mm
Drivetrain
Rear sprockets	6	8
Smallest sprocket	14	12
Largest sprocket	28	32
Lowest gear	22.9 in	24.0 in
Highest gear	45.7 in	64.0 in
Other specifications
Suspension	Hardtail	Full suspension
Wheel size	20″	24″
Tire clearance	Not informed	Maximum tire width: 2.3″