Velopedia Bicycle Archive
2023 Polygon Tambora G4
Cyclocross/Gravel bicycle from the Velopedia specification archive.
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What Velopedia knows
- Model year
- 2023
- Category
- Gravel & Cyclocross
- Original MSRP
- $899.00
- Sizes
- S, M, L, XL
- Colors
- White
- Geometry
- 7 manufacturer sizes · Geometry context
- Record coverage
- 21 preserved details · archived image · original MSRP · preserved geometry
- Archive ID
- 900001835
Frameset
| Frame Construction | ALX Gravel |
|---|---|
| Frame Material | Aluminum |
| Fork | Carbon Rigid |
| Fork Material | Carbon Fiber |
Drivetrain
| Shifters | Microshift Advent X SB-M100, 1X10-Speed Brifter |
|---|---|
| Rear Derailleur | Microshift Advent X M6205GM 10-speed |
| Crankset | Alloy 40T |
| Bottom Bracket | Threaded BSA 68mm |
| Cassette | Microshift Advent X CS-H104 10 Speed 11-48T |
| Chain | KMC X10 |
Brakes
| Brakes | Tektro MD-C550 Mechanical; Levers: Microshift Advent X SB-M100; Rotors: Tektro 160mm 6B |
|---|
Cockpit & Contact Points
| Headset | Token TK156SP-Chhc W/ Sealed Bearing |
|---|---|
| Handlebar | ALLOY FLARE 16degree, W: 420mm (S, M) / 440mm (L, XL), BB: 31,8mm, R/D: 125mm, B/R: 77mm |
| Stem | ALLOY STEM, EXT: 90mm (S, M) / 100mm (L, XL), BB: 31,8mm, R/D: 7degree |
| Saddle | Selle Italia Model X |
| Seatpost | Alloy Seatpost, DXL: 27,2 X 350mm |
Wheels & Tires
| Hubs | F: Alloy Disc Brake 12x100mm 32H 6B / R: Alloy Disc Brake 12x142mm 32H 6B for Sprocket |
|---|---|
| Wheels | Alloy Double Wall 32H |
| Rims | Alloy Double Wall FV H: 19 622x23 32H TLR |
| Front Tire | VEE Rail 700x40C 622x40 TLR |
| Rear Tire | VEE Rail 700x40C 622x40 TLR |
Size-specific frame data
Geometry
Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.
| Measurement | S · Speed Gravel | M · Speed Gravel | L · Speed Gravel | XL · Speed Gravel | S · All Road | L · All Road | XL · All Road |
|---|---|---|---|---|---|---|---|
| Seat tube | 404 mm | 448 mm | 492 mm | 535 mm | 404 mm | 492 mm | 535 mm |
| Effective top tube | 526 mm | 551 mm | 581 mm | 611 mm | 526 mm | 581 mm | 610 mm |
| Head tube | 143 mm | 163 mm | 193 mm | 221 mm | 143 mm | 193 mm | 221 mm |
| Head-tube angle | 70° | 71.5° | 71.8° | 72° | 70.25° | 72.06° | 72.26° |
| Seat-tube angle | 74.5° | 74° | 73.5° | 73° | 74.75° | 73.76° | 73.26° |
| Actual seat-tube angle | 74.5° | 74° | 73.5° | 73° | 74.75° | 73.76° | 73.26° |
| Chainstay / rear center | 425 mm | 425 mm | 425 mm | 425 mm | 415 mm | 415 mm | 415 mm |
| Wheelbase | 1017 mm | 1022 mm | 1045 mm | 1067 mm | 997 mm | 1026 mm | 1048 mm |
| Bottom-bracket drop | 78 mm | 78 mm | 78 mm | 78 mm | 79 mm | 79 mm | 79 mm |
| Bottom-bracket height | 280 mm | 280 mm | 280 mm | 280 mm | 265 mm | 265 mm | 265 mm |
| Reach | 369 mm | 381 mm | 397 mm | 412 mm | 371 mm | 400 mm | 415 mm |
| Stack | 568 mm | 593 mm | 622 mm | 650 mm | 566 mm | 621 mm | 648 mm |
| Standover height | 716 mm | 755 mm | 798 mm | 833 mm | 701 mm | 784 mm | 819 mm |
Geometry source: Polygon first-party metric geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
The manufacturer publishes more than one geometry configuration. Velopedia analyzes each labeled state separately while treating them as one chassis in archive comparisons.
S geometry
Configuration
Archive context: Its bottom-bracket drop of 78 mm sits somewhat deeper than typical. Its reach of 369 mm sits somewhat shorter than typical. Its stack of 568 mm sits somewhat taller than typical.
Compared with 59 distinct cyclocross/gravel geometries in the Small-equivalent size cohort from model years 2022–2025 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze S · Speed Gravel geometry Archive context: The chainstay of 415 mm sits toward the shorter rear-center end. Its wheelbase of 997 mm sits toward the shorter end. Its bottom-bracket drop of 79 mm sits toward the deeper-drop end.
Compared with 59 distinct cyclocross/gravel geometries in the Small-equivalent size cohort from model years 2022–2025 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze S · All Road geometry M geometry
Speed Gravel
Archive context: Its bottom-bracket drop of 78 mm sits toward the deeper-drop end. Its stack of 593 mm sits somewhat taller than typical. The head angle of 71.5° sits somewhat steeper than typical.
Compared with 63 distinct cyclocross/gravel geometries in the Medium-equivalent size cohort from model years 2022–2025 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze M · Speed Gravel geometry L geometry
Configuration
Archive context: Its bottom-bracket drop of 78 mm sits toward the deeper-drop end. The head angle of 71.8° sits somewhat steeper than typical. Its stack of 622 mm sits somewhat taller than typical.
Compared with 46 distinct cyclocross/gravel geometries in the Large-equivalent size cohort from model years 2022–2025 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze L · Speed Gravel geometry Archive context: The chainstay of 415 mm sits toward the shorter rear-center end. The head angle of 72.1° sits toward the steeper end. Its wheelbase of 1026 mm sits toward the shorter end.
Compared with 46 distinct cyclocross/gravel geometries in the Large-equivalent size cohort from model years 2022–2025 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze L · All Road geometry XL geometry
Configuration
Archive context: The head angle of 72° sits toward the steeper end. Its bottom-bracket drop of 78 mm sits toward the deeper-drop end. Its stack of 650 mm sits somewhat taller than typical.
Compared with 51 distinct cyclocross/gravel geometries in the XL-equivalent size cohort from model years 2021–2025 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XL · Speed Gravel geometry Archive context: The chainstay of 415 mm sits toward the shorter rear-center end. The head angle of 72.3° sits toward the steeper end. Its wheelbase of 1048 mm sits toward the shorter end.
Compared with 51 distinct cyclocross/gravel geometries in the XL-equivalent size cohort from model years 2021–2025 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XL · All Road geometry Parts & serviceability
Find replacement parts
ChainKMC X10Exact archived model
CassetteMicroshift Advent X CS-H104 10 Speed 11-48TExact archived model
Brake padsTektro MD-C550 MechanicalBrake model identified — verify pad shape
More qualified parts (3)
SaddleSelle Italia Model XNamed archived component — verify exact version
Rear derailleurMicroshift Advent X M6205GM 10-speedComponent family — verify exact version
ShiftersMicroshift Advent X SB-M100, 1X10-Speed BrifterComponent family — verify exact version
Searches use the archived manufacturer specification, not the components currently installed on a particular bicycle. Confirm the exact model, size and fit before ordering. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Commercial relationships do not influence Archive specifications or analysis.
Used-bike inspection
If you’re buying this bike used
Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.
Follow the full used-bike inspection order →- FrameLook closely for dents and hairline cracks around welds, the head tube and bottom-bracket area. Cosmetic scratches matter less than a change in shape or a crack line.Inspect the frame and fork →
- BrakesTest each brake separately and confirm it stops firmly and releases cleanly. Inspect the pads and braking surfaces for wear or contamination, and check the cables or hoses for damage.Inspect the brakes →
- DrivetrainShift through every gear under light load and measure chain wear. Confirm that the shifter, derailleur, chain and cassette belong to the same 10-speed system.Check drivetrain wear →
- Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads. If it is set up tubeless, confirm both tires hold pressure and ask when the sealant was last refreshed.Check wheels and tires →
- Bottom bracketTurn the cranks slowly, feel for rough bearings and check for side-to-side play. Creaking under load deserves investigation but does not identify the source by itself.Inspect the bottom bracket and shell →
Bike-specific inspection checklist 20 checks based on 5 archived component groups Open checklistClose checklist
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Identity and fit
Follow the full used-bike inspection order →Archived: 2023 Polygon Tambora G4 · Cyclocross/Gravel · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: ALX GRAVEL · Fork: CARBON RIGID · Carbon Fiber
Drivetrain
Check drivetrain wear →Archived: Shifters: MICROSHIFT ADVENT X SB-M100, 1x10-SPEED BRIFTER · Rear derailleur: MICROSHIFT ADVENT X M6205GM 10-SPEED · Crankset: ALLOY 40T · Bottom bracket: THREADED BSA 68mm · Cassette: MICROSHIFT ADVENT X CS-H104 10 SPEED 11-48T · Chain: KMC X10
Brakes
Inspect the brakes →Archived: Brakes: TEKTRO MD-C550 MECHANICAL; Levers: MICROSHIFT ADVENT X SB-M100; Rotors: TEKTRO 160mm 6B
Wheels and tires
Check wheels and tires →Archived: Wheels: ALLOY DOUBLE WALL 32H · Rims: ALLOY DOUBLE WALL FV H: 19 622X23 32H TLR · Hubs: F: ALLOY DISC BRAKE 12x100mm 32H 6B / R: ALLOY DISC BRAKE 12x142mm 32H 6B FOR SPROCKET · Front tire: VEE RAIL 700x40C 622x40 TLR · Rear tire: VEE RAIL 700x40C 622x40 TLR
Controls and contact points
Archived: Headset: TOKEN TK156SP-CHHC W/ SEALED BEARING · Handlebar: ALLOY FLARE 16degree, W: 420mm (S, M) / 440mm (L, XL), BB: 31,8mm, R/D: 125mm, B/R: 77mm · Stem: ALLOY STEM, EXT: 90mm (S, M) / 100mm (L, XL), BB: 31,8mm, R/D: 7degree · Seatpost: ALLOY SEATPOST, DXL: 27,2 x 350mm · Saddle: SELLE ITALIA MODEL X
Before and during the test ride
Follow the full used-bike inspection order →Build relationships are limited to the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Recently checked marketplace data
Market Snapshot
Velopedia did not find a close used eBay listing in the latest snapshot. New and used listings remain separate.
Evidence standard
Fixed-price and Best Offer item prices only
Shipping and tax excluded
Active asks, not completed sales
No close current matches found. Velopedia did not find an eBay listing confident enough to include in the latest snapshot.
Listings shown have not passed their eBay-supplied end time. Velopedia rechecks matched bicycles on a protected weekly cycle; availability can still change between checks. Price calculations use active fixed-price and Best Offer item prices before shipping and tax. Auction bids, auction-only prices, classified ads, lower-confidence Review candidates and ended listings are excluded. These observations are not completed-sale prices, a certified appraisal or a guarantee of value.
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.