Polygon Sierra Oosten

Name: Polygon Sierra Oosten
Brand: Polygon

2026 UrbanComfort Manufacturer page

Last known price: $599

Prices shown first for United States
Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 8 36t / 11–32t
Gear range: 291%
Frame: Aluminum
Brakes: Rim brake

Rider height by size (cm)

Size guide

SM/MD 154.9–170.2
MD/LG 167.6–180.3

Components

10 of 20 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 City Frame, Cruiser Specific Geometry, 6061 Alloy Not identified

Suspension

1 part

Fork

Hi-Ten Rigid Fork - Cruiser/Trekking Specific, Straight 1-1/8" Threaded Not identified

Drivetrain

5 parts

Cassette
- Shimano CS-HG31 8 speeds 11–32t
CS-HG31
Chain
- KMC Z8.3 8 speeds
Z-8
Crankset

36T Steel Not identified
Rear derailleur
- Shimano Altus RD-M310
RD-M310
Shifters
- Shimano SL-RS45-8R
SL-RS45-8R

Brakes

1 part

Brakes

Front: Alloy V-Brake, Rear: Alloy V-Brake Not identified

Wheels and tires

4 parts

Front hub
- Formula
Rear hub
- Formula
Rims

Double Wall Alloy Not identified
Tires

DELI 26 x 1-3/8" / 700 x 35C Not identified

Cockpit and contact points

6 parts

Handlebar
- Polygon
Headset

External Cup Threaded, S.H.I.S. EC 34/28.6 | 34/30 Not identified
Pedals

Nylon Platform Not identified
Saddle
- Selle Royal Ondina
Seatpost
- Polygon
Stem
- Polygon

Other components

2 parts

Fenders

Alloy Front & Back Not identified
Kickstand

Alloy Not identified

Sizes and geometry

2 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size SM/MD

Table

Reach 364mm

Stack 536mm

Wheelbase 1051mm

Head angle 69.0°

Seat angle 70.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c 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
Reachmm	364	379
Stackmm	536	550
Top tube lengthmm	560	580
Seat tube lengthmm	406	445
Head tube lengthmm	140	155
Head tube angle	69°	69°
Seat tube angle	70°	70°
Chainstay lengthmm	448	448
Wheelbasemm	1051	1071
Front centermm	606	626
Bottom bracket dropmm	37	37
Bottom bracket heightmm	298	298
Standover heightmm	472	476
Fork rakemm	46	45
Trailmm	85	86
Stack/reach ratio	1.47	1.45

Not published by the manufacturer: 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: Steel

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Rear sprockets: 8
Smallest sprocket: 11
Largest sprocket: 32
Lowest gear: 32.6 in
Highest gear: 94.9 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 35c
Travel: Front: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 700c

Gearing

Estimated speeds at 80 rpm

Lowest gear: 12.5 km/h
Highest gear: 36.4 km/h

Total gear range 291%

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.