Polygon Tambora A4

2026 RoadGravel Manufacturer page

Polygon Tambora A4, color Charcoal - Blue

Last known price: $1,799

Prices shown first for United States
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 11 31–48t / 11–34t
Gear range: 479%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 150–164
MD 162–176
LG 174–189
XL 187–195

Components

16 of 23 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

CARBON RIGID Not identified

Drivetrain

7 parts

Bottom bracket

BSA, 68mm Not identified
Cassette
- Shimano CS-HG700-11 11 speeds 11–34t
CS-HG700-11CS-HG700
Chain
- KMC X11 11 speeds
Crankset
- Prowheel 31t
Front derailleur
- Shimano GRX FD-RX810 2 speeds
FD-RX810
Rear derailleur
- Shimano GRX RD-RX810 11 speeds
RD-RX810
Shifters
- Shimano GRX ST-RX600
ST-RX600

Brakes

3 parts

Wheels and tires

5 parts

Front hub
- Novatec
Rear hub
- Novatec
Rims

F: ALLOY DOUBLE WALL FV H: 20 622 32H TLR / R: ALLOY DOUBLE WALL FV H: 20 622 32H TLR Not identified
Spokes

F: STAINLESS 14G NDS:290 & DS:292 W/ NIPPLE BRASS / R: STAINLESS 14G NDS:292 & DS290: W/ NIPPLE BRASS Not identified
Tires
- Maxxis Pursuer

Cockpit and contact points

6 parts

Grips

Bar Tape Not identified
Handlebar
- Polygon
Headset
- Token
Saddle

LINC FLUX 2 Not identified
Seatpost
- Polygon
Stem
- Polygon

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 383mm

Stack 591mm

Wheelbase 1003mm

Head angle 71.8°

Seat angle 74.3°

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 4 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	371	383	400	415
Stackmm	566	591	621	648
Top tube lengthmm	526	550	581	610
Seat tube lengthmm	404	448	492	535
Head tube lengthmm	143	163	193	221
Head tube angle	70.25°	71.77°	72.06°	72.26°
Seat tube angle	74.75°	74.26°	73.76°	73.26°
Chainstay lengthmm	415	415	415	415
Wheelbasemm	997	1003	1026	1048
Front centermm	595	601	624	645
Bottom bracket dropmm	79	79	79	79
Bottom bracket heightmm	265	265	265	265
Standover heightmm	701	741	784	819
Fork rakemm	41	42	41	41
Trailmm	82	71	70	69
Stack/reach ratio	1.53	1.54	1.55	1.56
Suspension and parts
Crank lengthmm	170	170	170	170
Handlebar widthmm	420	420	440	440
Stem lengthmm	90	90	100	100

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: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 31
Largest chainring: 48
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 26.4 in
Highest gear: 126.6 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
Tire clearance: Maximum tire width: 45c
Tire width: 32c
Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

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

Lowest gear

26.4 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2026
Sample: 1,455 bicycles with this information
Coverage: 73.2% of the class

Highest gear

126.6 gear inches

This value is above the central range for this class.

Cohort: Road / Gravel Model year: 2026
Sample: 1,455 bicycles with this information
Coverage: 73.2% of the class

Shifting

Mechanical

706 of 1,980 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2026
Sample: 1,980 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.1 km/h
Highest gear: 48.5 km/h

Total gear range 479%

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: 26.4–126.6 gear inches
Class reference (p10–p90): 22.8–127.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2026
Lowest gear: 1455 bicycles with this information, 73.2% of the class
Highest gear: 1455 bicycles with this information, 73.2% 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 2026 builds
Specification	This bicycle Polygon Tambora A4	Polygon Tambora A5	Polygon Tambora A9X	Polygon Tambora G4	Polygon Tambora G5	Polygon Tambora G7
Frame
Frame material	Aluminum	Carbon	Carbon	Aluminum	Carbon	Carbon
Drivetrain
Front chainrings	2	2	2	1	1	1
Smallest chainring	31	32	31	40	40	40
Largest chainring	48	48	48	40	40	40
Rear sprockets	11	11	12	10	11	12
Largest sprocket	34	34	34	48	42	44
Lowest gear	26.4 in	27.3 in	26.4 in	24.2 in	27.6 in	26.4 in
Highest gear	126.6 in	126.6 in	126.6 in	105.5 in	105.5 in	105.5 in
Brakes
Brake type	Hydraulic disc	Hydraulic disc	Hydraulic disc	Mechanical disc	Hydraulic disc	Hydraulic disc
Cockpit
Shifting	Mechanical	Mechanical	Electronic	Mechanical	Mechanical	Mechanical
Other specifications
Bottom bracket standard	BSA	T47	T47	BSA	T47	T47
Tire clearance	Maximum tire width: 45c	Maximum tire width: 45c	Not informed	Not informed	Not informed	Not informed
Tire width	32c	32c	32c	40c	40c	40c
Wheel material	Aluminum	Aluminum	Carbon	Aluminum	Aluminum	Carbon