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TAMBORA: Our Most Versatile Gravel Machine
TAMBORA G8X
Specification
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Frameset
FramesetForkFrame ColorDecal Color
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Drivetrain
ShifterCrankCassetteRear DerailleurBBChain
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Cockpit
SaddleSeatpostHandlebarHandlestemHeadset
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Wheel & Tire
Wheel SetTireRimHubSpokes
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Brake
Brake LeverBrake CaliperRotor
Geometry & Size
| S | M | L | XL | |
|---|---|---|---|---|
| Height (cm) | 150-163 | 163-175 | 175-188 | 188-195 |
| Seat Tube Length (A) | 404 15.91 | 448 17.64 | 492 19.37 | 535 21.06 |
| Seat Tube Angle (B) | 74.5 2.93 | 74 2.91 | 73.5 2.89 | 73 2.87 |
| Effective Seat Tube Angle (C) | 74.5 2.93 | 74 2.91 | 73.5 2.89 | 73 2.87 |
| Head Tube Length (D) | 143 5.63 | 163 6.42 | 193 7.6 | 221 8.7 |
| Head Tube Angle (E) | 70 2.76 | 71.5 2.81 | 71.8 2.83 | 72 2.83 |
| Effective Top Tube (F) | 526 20.71 | 551 21.69 | 581 22.87 | 611 24.06 |
| Bb Height (G) | 280 11.02 | 280 11.02 | 280 11.02 | 280 11.02 |
| Bb Offset (H) | 78 3.07 | 78 3.07 | 78 3.07 | 78 3.07 |
| Chainstay Length (I) | 425 16.73 | 425 16.73 | 425 16.73 | 425 16.73 |
| Wheelbase (J) | 1017 40.04 | 1022 40.24 | 1045 41.14 | 1067 42.01 |
| Frame Reach (K) | 369 14.53 | 381 15 | 397 15.63 | 412 16.22 |
| Frame Stack (L) | 568 22.36 | 593 23.35 | 622 24.49 | 650 25.59 |
| Standover Height (M) | 716 28.19 | 755 29.72 | 798 31.42 | 833 32.8 |
| S | M | L | XL | |
|---|---|---|---|---|
| Height (cm) | 150-163 | 163-175 | 175-188 | 188-195 |
| Seat Tube Length (A) | 404 15.91 | 448 17.64 | 492 19.37 | 535 21.06 |
| Seat Tube Angle (B) | 74.75 2.94 | 74.26 2.92 | 73.76 2.9 | 73.26 2.88 |
| Effective Seat Tube Angle (C) | 74.75 2.94 | 74.26 2.92 | 73.76 2.9 | 73.26 2.88 |
| Head Tube Length (D) | 143 5.63 | 163 6.42 | 193 7.6 | 221 8.7 |
| Head Tube Angle (E) | 70.25 2.77 | 71.77 2.83 | 72.06 2.84 | 72.26 2.84 |
| Effective Top Tube (F) | 526 20.71 | 550 21.65 | 581 22.87 | 610 24.02 |
| Bb Height (G) | 265 10.43 | 265 10.43 | 265 10.43 | 265 10.43 |
| Bb Offset (H) | 79 3.11 | 79 3.11 | 79 3.11 | 79 3.11 |
| Chainstay Length (I) | 415 16.34 | 415 16.34 | 415 16.34 | 415 16.34 |
| Wheelbase (J) | 997 39.25 | 1003 39.49 | 1026 40.39 | 1048 41.26 |
| Frame Reach (K) | 371 14.61 | 383 15.08 | 400 15.75 | 415 16.34 |
| Frame Stack (L) | 566 22.28 | 591 23.27 | 621 24.45 | 648 25.51 |
| Standover Height (M) | 701 27.6 | 741 29.17 | 784 30.87 | 819 32.24 |
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FAQ
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Where are the mounts to hold gear? If I wanted to buy a bolted bag, what are the specifications? For full frame and half frame
There are 14 mounts on the Polygon Tambora series; 3 on the top tube, 7 on the down tube, 2 on the seat tube, and a pair of rear carrier mounts. We're using universal-size mounts, so there are no special specifications for the compatible bolted bag. You can freely choose the bolted bag that fits you best.
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What is the biggest chainring I can fit?
The maximum chainring of Tambora series is 42T
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What are the biggest rotors I can fit?
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Can you fit mudguards, pannier racks front and back?
The biggest rotors for the Tambora series are 160 mm
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How do you change the flip chip?
Of course! Tambora Series can be equipped with a rear pannier or rear mudguard.
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Can I fit a dropper post?
The Tambora has flip chips located at the rear dropouts and the base of the fork, allowing you to easily switch between gravel and all-road configurations. Watch the full video here.
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Is it possible to upgrade a road bike to a gravel bike?
Yes! But it should be a gravel bike dropper post which commonly designed from 50mm to 125mm of travel.
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What is the best configuration for bikepacking gear?
This should not be possible because of the small tire clearance and its fixed aggressive geometry.
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How does the geometry of Tambora bikes differ from gravel bikes and other road bikes?
The best configuration of bikepacking typically is a lightweight and compact gear that can bring all of your needs. But it can vary depending on the individual's preferences, the specific trip's requirements, and the terrain being covered.
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What are the gearing differences on gravel vs road bikes?
The gravel bike has a higher stack, slacker head angle, and longer wheelbase for stability.