Tambora G4
OverviewAbout the Polygon Tambora G4
The Polygon Tambora G4 is a gravel bike, built on an aluminium frame, listed at $1,199.99 at BikesOnline. A drop-bar all-road bike for gravel, dirt and mixed surfaces.
Our takeWho the Tambora G4 suits
Riders planning bikepacking or loaded touring on a budget: 14 mounting points, a carbon fork, 40 mm tyres with room for 45 mm, and a microSHIFT Advent X 1x10 drivetrain with an 11 to 48 cassette.
What you give up
- Mechanical disc brakes (Tektro MD-C550) rather than hydraulic.
- The 10-speed microSHIFT drivetrain has wide gaps between gears.
Fit
Four sizes, S to XL. Polygon puts M at 163 to 175 cm. Use the size finder below to check your height against the chart.
Also worth a look
- Canyon Grizl 6: Dearer, with SRAM Apex 12-speed and room for 54 mm tyres.
Desk research by BikeFinder from the published specification and geometry on this page, checked 2 Nov 2026. We have not ridden this bike.
How it comparesThe Tambora G4 against similarly priced bikes
- At $1,199.99 it costs less than 93% of the 86 gravel bikes we list.
- Head angle: 71.5 degrees, about the same as similarly priced gravel bikes (middle 71.3 degrees).
- Reach (size M): 381 mm, shorter, so a more upright position than the middle of similarly priced gravel bikes (405 mm).
- Gears at the back: 10-speed, more than the middle of similarly priced gravel bikes (9-speed).
- Stock tyre width: 40 mm, about the same as similarly priced gravel bikes (middle 40 mm).
Closest alternatives on price
$50 more · 8-speed vs 10-speed
$89 more · 8-speed vs 10-speed
$100 less · chromoly frame · 8-speed vs 10-speed
$100 more · hydraulic brakes
Compare the Tambora G4 with the two closest side by side
Compared with the 10 similar gravel bikes on BikeFinder priced $850 to $1,600, using each bike's published specs and the price shown on its page.
SizingWhat size Tambora G4 do I need?
Enter your height to see the size Polygon recommends.
| Size | Rider height | In feet |
|---|---|---|
| S | 150 to 163 cm | 4 ft 11 in to 5 ft 4 in |
| M | 163 to 175 cm | 5 ft 4 in to 5 ft 9 in |
| L | 175 to 188 cm | 5 ft 9 in to 6 ft 2 in |
| XL | 188 to 195 cm | 6 ft 2 in to 6 ft 5 in |
Rider heights from Polygon's size chart (the brand chart for this model family). Height is a starting point: arm and leg length, flexibility and riding style all matter, so a test ride beats any chart. How bike sizing works.
SpecificationsWhat we know
- Brand
- Polygon
- Model year
- 2024
- Category
- Gravel
- Frame
- Aluminium
- Wheel size
- 700c
- Drivetrain
- Microshift Advent 10-speed
- Brakes
- Disc
- Frame sizes
- S, M, L, XL
- Price
- $1,199.99 at BikesOnline, was $1,699.99. In stock, checked 10 Nov 2026.
Specs and pricing are listed in AUD and sourced from Australian retail listings. Confirm the current details and availability with the seller before purchase.
GeometrySize M
- Stack
- 593 mm
- Reach
- 381 mm
- Stack/reach
- 1.56
- Head angle
- 71.5 deg
- Seat angle
- 74 deg
- Wheelbase
- 1022 mm
- Chainstay
- 425 mm
- BB drop
- 78 mm
- Standover
- 755 mm
Drivetrain & buildFull specification
- Groupset
- Microshift Advent X
- Shifting
- Mechanical
- Drive
- 1x
- Speeds
- 10
- Crank
- Alloy, 40T
- Cassette
- Microshift Advent X CS-H104, 10-speed
- Rear derailleur
- Microshift Advent X M6205GM, 10-speed
- Brakes
- Tektro MD-C550 mechanical disc
- Rotors
- 160mm
- Wheelset
- Alloy double wall, 32H
- Rim internal width
- 19 mm
- Stock tyre
- 700x40C
- Max tyre clearance
- 45 mm
- Tubeless
- Yes
- Fork material
- Carbon rigid
- BB standard
- Threaded BSA 68mm
- Thru-axle
- Front 12x100mm, Rear 12x142mm
- Seatpost
- Alloy, 27.2 x 350mm
- Cockpit
- Alloy flare bar (420mm S/M, 440mm L/XL, 16 degree flare) with alloy stem (90mm S/M, 100mm L/XL, 7 degree)
- Saddle
- Selle Italia Model X
- Mounts
- 14 universal mounts (3 top tube, 7 down tube, 2 seat tube, rear carrier pair)
Bike DNAWhat the numbers say
- Position
- Stack-to-reach 1.56 gives an upright, comfort-oriented riding position.
- Steering
- A 71.5 deg head angle points to balanced steering.
Derived from the published geometry and gearing above. It describes the numbers, not a ride test.
BikeFinder Data Profile: geometry and specification researched from published sources (polygonbikes.com product page (tambora-g4)), verified 2026-09-04. This is a specification analysis, not a physical ride review.
Where to buyStockist
BikeFinder is an independent directory. We link to retailers; prices and stock are set by the seller and shown as at the date checked. This is an affiliate link. If you buy through it BikeFinder may earn a small commission, at no extra cost to you.