UNVEIL THE TAMBORA
The Polygon Tambora G4 Advent X is a versatile gravel bike built for riders who want dependable performance, comfort, and control across mixed terrain. Its ALX gravel alloy frame is lightweight, durable, and designed for stability whether you’re exploring dirt roads, tackling long gravel rides, or commuting with confidence. Paired with a carbon rigid fork, the G4 delivers excellent steering precision and vibration dampening for smoother, more efficient riding on rough surfaces.
Powered by the Microshift Advent X 1x10 drivetrain, the Tambora G4 offers wide-range gearing with simple, low-maintenance operation. The 11–48T cassette and clutch-equipped rear derailleur provide reliable chain retention and smooth shifting on steep climbs and fast descents. Tektro mechanical disc brakes ensure strong and predictable stopping power, giving riders confidence in all weather conditions.
Wide tubeless-ready Vee Rail tyres and a robust double-wall wheelset deliver grip, comfort, and durability on challenging terrain. With ergonomic alloy cockpit components, Selle Italia Model X saddle, and thru-axle wheel integration, the Tambora G4 is built for adventure. It’s the ideal gravel companion for riders seeking performance, value, and capability for both everyday use and off-road exploration.
FEATURES
Lightweight ALX gravel alloy frame offering stability, durability, and comfort for long mixed-terrain rides
Carbon rigid fork delivering precise steering and excellent vibration reduction across rough gravel surfaces
Microshift Advent X 1x10 drivetrain providing a wide gear range, smooth shifting, and low-maintenance simplicity
Tektro MD-C550 mechanical disc brakes offering strong, predictable stopping power in any weather
Tubeless-ready Vee Rail 700x40C tyres enhancing grip, comfort, and rolling efficiency on dirt and gravel
Durable alloy double-wall wheelset with 12x100 mm / 12x142 mm thru-axles for improved strength and responsiveness
Ergonomic alloy handlebar with 16° flare for better stability and control on technical terrain
SIZE GUIDE
S Frame Size 150 to 163cm Height
M Frame Size 163 to 175cm Height
L Frame Size 175 to 188cm Height
XL Frame Size 188 to 195cm Height
SPECIFICATIONS
Frame Material: ALX Gravel
Fork: Carbon rigid
Shifter: Microshift Advent X SB-M100, 1x10-speed brifter
Crankset: Alloy, 40T
Cassette: Microshift Advent X CS-H104, 10-speed, 11–48T
Rear Derailleur: Microshift Advent X M6205GM, 10-speed
Saddle: Selle Italia Model X
Seatpost: Alloy seatpost, 27.2 x 350 mm
Handlebar: Alloy flare 16°, width 420 mm (S, M) / 440 mm (L, XL), clamp 31.8 mm, rise/drop 125 mm, reach 77 mm
Stem: Alloy stem, extension 90 mm (S, M) / 100 mm (L, XL), clamp 31.8 mm, rise/drop 7°
Headset: Token TK156SP-CHHC with sealed bearing
Wheelset: Alloy double wall, 32H
Tyres: Vee Rail 700 x 40C (622 x 40), tubeless-ready
Rims: Alloy double wall FV, height 19 mm, 622 x 23, 32H, tubeless-ready
Hubs:
Front: Alloy disc brake, 12 x 100 mm, 32H, 6-bolt
Rear: Alloy disc brake, 12 x 142 mm, 32H, 6-bolt, cassette-type
Spokes:
Front: Stainless 14G, NDS 290 mm / DS 294 mm, brass nipples
Rear: Stainless 14G, NDS 292 mm / DS 290 mm, brass nipples
Brake Levers: Microshift Advent X SB-M100
Brake Calipers: Tektro MD-C550 mechanical disc
Rotors: Tektro 160 mm, 6-bolt
