Marin Gestalt vs Polygon Tambora G4
A side by side comparison of two gravel bikes available in Australia, on price and specs. The Marin Gestalt is the lower-priced of the two.
| 2 of 4 bikesDeltas are against the baseline | |||
|---|---|---|---|
| Price and where to buy | |||
| Current Australian price | $1,249.99Lowest | $1,299.99 | |
| RRP | $1,249.99 | $1,299.99 | |
| Price source | BikesOnline price, checked 14 Oct 2026 | BikesOnline price, checked 14 Oct 2026 | |
| Retailers | BikesOnline | BikesOnline | |
| Overview | |||
| Category | Gravel | Gravel | |
| Type | Non-electric | Non-electric | |
| Model year | 2025 | 2024 | |
| Frame and suspension | |||
| Frame | Aluminium | Aluminium | |
| Fork | aluminium | Carbon rigid | |
| Wheels and tyres | |||
| Wheelset | Marin alloy double wall | Alloy double wall, 32H | |
| Wheel size | 700c | 700c | |
| Stock tyres | 700x36c | 700x40C | |
| Max tyre clearance | 45 mm | 45 mmsame | |
| Drivetrain | |||
| Groupset | Shimano Claris | Microshift Advent X | |
| Shifting | Mechanical, 2x | Mechanical, 1x | |
| Crank | FSA Tempo Compact | Alloy, 40T | |
| Chainrings | 50/34 | Not published | |
| Cassette | SunRace 8-speed | Microshift Advent X CS-H104, 10-speed | |
| Cassette speeds | 8 | 10 | |
| Lowest gearRatio of smallest ring to biggest cog. Lower is easier climbing. | 1.06 | Not published | |
| Highest gearBiggest ring to smallest cog. Higher is a faster top speed. | 4.55 | Not published | |
| Gearing character | Endurance gearing | Not published | |
| Brakes and weight | |||
| Brakes | Tektro MD-C400 mechanical disc | Tektro MD-C550 mechanical disc | |
| Rotors | 160/160 | 160mm | |
| Geometry | |||
| Size shown | 54 | M | |
| Stack | 582 mm | 593 mm+11 mm | |
| Reach | 377 mm | 381 mm+4 mm | |
| Stack to reachHigher is more upright, lower is more stretched out. | 1.54 | 1.56+0.02 | |
| Head angleLower (slacker) is calmer at speed, higher (steeper) is quicker steering. | 71.5 deg | 71.5 degsame | |
| Seat angle | 73.5 deg | 74.0 deg+0.5 deg | |
| Wheelbase | 1,024 mm | 1,022 mm-2 mm | |
| Chainstay | 432 mm | 425 mm-7 mm | |
| BB drop | 78 mm | 78 mmsame | |
Geometry overlay
Line up at
Hover a bike to highlight it, click to hide it.Tap a bike to hide or show it.
- Marin Gestalt (size 54) is the baseline.
- Polygon Tambora G4 (size M): 11 mm taller stack, 4 mm longer reach, 2 mm shorter wheelbase, 7 mm shorter chainstays.
Stack, reach, head and seat angles, wheelbase, chainstay and BB drop are drawn to scale from published charts. Tube shapes are schematic. Sizes differ between these bikes, so check the size you would actually ride.
BikeFinder Data Profile. Geometry and component figures are researched from published manufacturer and retailer sources, not physical ride tests, and can vary by model year.
Specs and pricing are listed in AUD and sourced from Australian retail listings. Confirm current details with the seller before purchase.