Polygon Kalosi Altera ST

Name: Polygon Kalosi Altera ST
Brand: Polygon

2025 UrbanCommuter Electric bicycle Manufacturer page

Last known price: $1,999

Prices shown first for United States
Fork travel: 75 mm
Wheels: 650b
Drivetrain: 1 × 9 44t / 11–46t
Gear range: 418%
Battery: 690 Wh
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

MD 159–171
LG 169–180

Components

12 of 27 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 e-City Commuting, Threaded BB 68mm, Integrated Downtube Battery, Internal Cable Routing Not identified

Electric system

4 parts

Battery

Greenway ZZ618, 690Wh ( 48V, 15Ah ) Smart battery utilizing LG 21700 cells Not identified
Charger

Greenway MD310 with an output of 54.6V/4A Not identified
Display
- Bafang
Motor
- Bafang

Suspension

1 part

Fork
- SR Suntour MOBIE

Drivetrain

7 parts

Bottom bracket

BSA, 68mm, threaded Not identified
Cassette
- Shimano CS-LG300-9 9 speeds 11–46t
CS-LG300
Chain
- KMC
Chain guide

Single CG include Chainring Not identified
Crankset

44T Not identified
Rear derailleur
- Shimano Cues RD-U4000 9 speeds
RD-U4000
Shifters
- Shimano Cues SL-U4010 9 speeds
SL-U4010

Brakes

2 parts

Brakes
- Shimano
BR-MT201
Disc rotors
- Shimano SM-RT26
SM-RT26

Wheels and tires

4 parts

Front hub

Alloy, 15x100mm, 32H, 6B Not identified
Rear hub
- Bafang
Rims

Alloy Double Wall, 23mm Internal Width Not identified
Tires
- Maxxis Metropass

Cockpit and contact points

6 parts

Handlebar

680mm Width, 31.8mm, Alloy Not identified
Headset

S.H.I.S. ZS 56/28.6 | ZS 56/40 Not identified
Pedals

Included Not identified
Saddle
- Selle Royal
Seatpost

30.9x350mm, Alloy Not identified
Stem

75mm Length, 31.8mm, Alloy Not identified

Other components

2 parts

Fenders

Front & Rear Not identified
Kickstand

Included (direct mount to chain stays) Not identified

Sizes and geometry

2 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 385mm

Stack 621mm

Wheelbase 1061mm

Head angle 73.0°

Seat angle 74.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 650b wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 2 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	385	415
Stackmm	621	621
Top tube lengthmm	593	593
Seat tube lengthmm	400	431
Head tube lengthmm	120	120
Head tube angle	73°	73°
Seat tube angle	74°	74°
Chainstay lengthmm	445	445
Wheelbasemm	1061	1091
Front centermm	625	655
Bottom bracket dropmm	70	70
Bottom bracket heightmm	294.5	294.5
Standover heightmm	521	521
Fork rakemm	65	65
Trailmm	33	33
Stack/reach ratio	1.61	1.50
Suspension and parts
Crank lengthmm	170	170
Handlebar widthmm	680	680
Stem lengthmm	75	75

Not published by the manufacturer: Front travel, Rear travel, 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: 75 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 44
Largest chainring: 44
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 46
Lowest gear: 26.3 in
Highest gear: 110.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Electric system

Battery capacity: 690 Wh

Additional specifications

Battery: Greenway ZZ618, 690Wh ( 48V, 15Ah ) Smart battery utilizing LG 21700 cells
Bottom bracket standard: BSA
Fork spring: Coil
Tire clearance: Maximum tire width: 2.6″
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 650b

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.1 km/h
Highest gear: 42.1 km/h

Total gear range 418%

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: 26.3–110.0 gear inches

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 Kalosi Altera ST	Polygon Kalosi Altera	Polygon Kalosi Altera High Step	Polygon Kalosi Altera LOW Step	Polygon Kalosi Lanes EVO High Step	Polygon Kalosi Lanes EVO LOW Step
Frame
Fork material	Aluminum	Aluminum	Not informed	Not informed	Not informed	Not informed
Suspension
Front travel	75 mm	75 mm	Not informed	Not informed	100 mm	100 mm
Drivetrain
Rear sprockets	9	9	9	9	10	10
Largest sprocket	46	46	46	46	48	48
Lowest gear	26.3 in	26.3 in	26.3 in	26.3 in	25.2 in	25.2 in
Electric bicycle systems
Battery capacity	690 Wh	690 Wh	Not informed	Not informed	504 Wh	504 Wh
Other specifications
Bottom bracket standard	BSA	BSA	Not informed	Not informed	Not informed	Not informed
Fork spring	Coil	Coil	Not informed	Not informed	Coil	Coil
Tire clearance	Maximum tire width: 2.6″	Maximum tire width: 2.6″	Not informed	Not informed	Not informed	Not informed