Polygon Cascade 20

2027 YouthMountain youth Manufacturer page

Polygon Cascade 20, color Dark Blue Gloss / White Gloss

Last known price: $279

Prices shown first for United States
Fork travel: 40 mm
Wheels: 20″
Drivetrain: 1 × 7 30t / 14–28t
Gear range: 200%
Frame: Aluminum
Brakes: Mechanical disc

Sizes

Size guide

ALL SIZE

The manufacturer did not publish rider heights for these sizes.

Components

6 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

aluminum Not identified

Suspension

1 part

Fork

SUSPENSION FORK 40mm TRAVEL Not identified

Drivetrain

6 parts

Bottom bracket

ALLOY SQUARE BB, 68mm Not identified
Cassette

7-SPEED 14-28T Not identified
Chain

MEILE M70 Not identified
Crankset

ALLOY CRANK, 30T Not identified
Rear derailleur
- Shimano Tourney RD-TY200 7 speeds
RD-TY200
Shifters
- Shimano Tourney

Brakes

3 parts

Wheels and tires

5 parts

Front hub

F: ALLOY M9x100mm 32H QR, R: ALLOY M10x135mm 32H QR Not identified
Rear hub

F: ALLOY M9x100mm 32H QR, R: ALLOY M10x135mm 32H QR Not identified
Rims

ALLOY DOUBLE WALL H: 20mm W: 21mm 406 32H FOR TYRE 406-35/62 Not identified
Spokes

F: 14G STAINLESS NDS: 182mm DS: 184mm W/ 12mm NIPPLE BRASS, R: 14G STAINLESS NDS: 184mm DS: 182mm W/ 12mm NIPPLE BRASS Not identified
Tires
- Kenda

Cockpit and contact points

5 parts

Handlebar

STEEL HANDLEBAR, W: 560mm, BB: 25.4, R/D: 7degree, B: 6degree Not identified
Headset

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

ONE PIECE PP BODY Not identified
Saddle

BLACK, STEEL ø7mm Not identified
Seatpost

STEEL SEATPOST, DxL: 27.2x300mm Not identified

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 ALL SIZE

Table

Reach 305mm

Stack 454mm

Wheelbase 845mm

Head angle 70.0°

Seat angle 72.0°

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.

Size Reach Stack

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	305
Stackmm	454
Top tube lengthmm	453
Seat tube lengthmm	254
Head tube lengthmm	100
Head tube angle	70°
Seat tube angle	72°
Chainstay lengthmm	350
Wheelbasemm	844.8
Front centermm	499
Bottom bracket dropmm	-42.5
Bottom bracket heightmm	215
Standover heightmm	476
Fork rakemm	11
Stack/reach ratio	1.49

Not published by the manufacturer: 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: 40 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 7
Smallest sprocket: 14
Largest sprocket: 28
Lowest gear: 21.4 in
Highest gear: 42.9 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 1.95″
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

21.4 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2027
Sample: 42 bicycles with this information
Coverage: 87.5% of the class

Highest gear

42.9 gear inches

This value is below the central range for this class.

Cohort: Youth / Mountain youth Model year: 2027
Sample: 42 bicycles with this information
Coverage: 87.5% of the class

Shifting

Mechanical

2 of 48 bicycles with this information use electronic shifting.

Cohort: Youth / Mountain youth Model year: 2027
Sample: 48 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.2 km/h
Highest gear: 16.4 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: 21.4–42.9 gear inches
Class reference (p10–p90): 15.0–68.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2027
Lowest gear: 42 bicycles with this information, 87.5% of the class
Highest gear: 42 bicycles with this information, 87.5% 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 2027 builds
Specification	This bicycle Polygon Cascade 20	Polygon Cascade 24
Suspension
Front travel	40 mm	50 mm
Drivetrain
Smallest chainring	30	32
Largest chainring	30	32
Lowest gear	21.4 in	27.4 in
Highest gear	42.9 in	54.9 in
Other specifications
Tire width	1.95″	2.1″
Wheel size	20″	24″

Changes since 2026
Specification	2026 Polygon Cascade 20	This bicycle Polygon Cascade 20
Frame
Fork material	Aluminum	Not informed
Other specifications
Bottom bracket standard	BSA	Not informed
Fork spring	Coil	Not informed
Tire clearance	Maximum tire width: 1.95″	Not informed
Travel	Configuration: HardtailFront: Travel: 40 mmRear: Additional specification: Not available: Yes	Configuration: HardtailFront: Travel: 40 mm