Velopedia Bicycle Archive
2020 Giant Fathom 29 2
Original manufacturer specifications including geometry for 4 published sizes.
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What Velopedia knows
- Model year
- 2020
- Category
- Mountain
- Original MSRP
- $1,200.00
- Sizes
- S, M, L, XL
- Colors
- Silver, Pure Red
- Geometry
- 4 manufacturer sizes · Geometry context
- Record coverage
- 22 preserved details · 2 archived images · original MSRP · preserved geometry
- Archive ID
- 900002225
Frameset
| Frame Construction | ALUXX SL-Grade Aluminum |
|---|---|
| Frame Material | Aluminum |
| Fork | Suntour Raidon XC LO-R (100mm, tapered, 15x110 QR) OR Giant Crest 34 Suspension Fork |
| Rear Shock | N/A |
Drivetrain
| Shifters | SRAM SX Eagle |
|---|---|
| Front Derailleur | N/A |
| Rear Derailleur | SRAM SX Eagle |
| Crankset | SRAM Eagle SX Eagle DUB, 30t |
| Bottom Bracket | SRAM DUB, press fit |
| Cassette | SRAM SX Eagle, 11x50 |
| Chain | SRAM SX Eagle |
| Pedals | platform |
Brakes
| Brakes | Tektro HDM 275 |
|---|
Cockpit & Contact Points
| Handlebar | Giant Connect Trail, 780x31.8, [GA 690] |
|---|---|
| Stem | Giant Contact |
| Saddle | Giant custom |
| Seatpost | Giant Connect, 30.9 |
Wheels & Tires
| Hubs | [F] Giant Tracker Performance Boost 15x110, sealed bearing [R] Giant Tracker Giant Sport Boost QR 141, loose ball |
|---|---|
| Rims | Giant XCT 29” tubeless ready sleeve-joint rim, 25mm inner width |
| Spokes | Sapim |
| Front Tire | [F] Maxxis Forekaster 2, , EXO/TR[R] Maxxis 29x2.35 Rekon Race, foldable, , EXO/T |
| Rear Tire | [F] Maxxis Forekaster 2, , EXO/TR[R] Maxxis 29x2.35 Rekon Race, foldable, , EXO/T |
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 | M | L | XL |
|---|---|---|---|---|
| Seat tube | 390 mm | 445 mm | 480 mm | 530 mm |
| Top tube | 585 mm | 605 mm | 625 mm | 645 mm |
| Head tube | 95 mm | 100 mm | 115 mm | 130 mm |
| Head-tube angle | 69° | 69° | 69° | 69° |
| Seat-tube angle | 73.5° | 73.5° | 73.5° | 73.5° |
| Chainstay / rear center | 442 mm | 442 mm | 442 mm | 442 mm |
| Wheelbase | 1100 mm | 1121 mm | 1142 mm | 1163 mm |
| Bottom-bracket drop | 55 mm | 55 mm | 55 mm | 55 mm |
| Reach | 406 mm | 425 mm | 441 mm | 457 mm |
| Stack | 603 mm | 608 mm | 622 mm | 636 mm |
| Standover height | 700 mm | 739 mm | 751 mm | 782 mm |
| Fork offset / rake | 42 mm | 42 mm | 42 mm | 42 mm |
| Trail | 100.5 mm | 100.5 mm | 100.5 mm | 100.5 mm |
| Crank length | 170 mm | 175 mm | 175 mm | 175 mm |
| Stem length | 60 mm | 70 mm | 80 mm | 90 mm |
| Handlebar width | 780 mm | 780 mm | 780 mm | 780 mm |
| Wheel size | 29" | 29" | 29" | 29" |
Geometry source: Giant first-party size geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
S geometry
Archive context: The head angle of 69° sits toward the steeper end. The chainstay of 442 mm sits toward the longer rear-center end. Its wheelbase of 1100 mm sits toward the shorter end.
Compared with 70 distinct mountain geometries in the Small-equivalent size cohort from model years 2018–2022 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 geometry M geometry
Archive context: Its wheelbase of 1121 mm sits toward the shorter end. The head angle of 69° sits toward the steeper end. The chainstay of 442 mm sits toward the longer rear-center end.
Compared with 73 distinct mountain geometries in the Medium-equivalent size cohort from model years 2018–2022 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 geometry L geometry
Archive context: Its wheelbase of 1142 mm sits toward the shorter end. The head angle of 69° sits toward the steeper end. Its reach of 441 mm sits toward the shorter end.
Compared with 69 distinct mountain geometries in the Large-equivalent size cohort from model years 2018–2022 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 geometry XL geometry
Archive context: Its wheelbase of 1163 mm sits toward the shorter end. The head angle of 69° sits toward the steeper end. Its reach of 457 mm sits toward the shorter end.
Compared with 60 distinct mountain geometries in the XL-equivalent size cohort from model years 2018–2022 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 geometry Parts & serviceability
Find replacement parts
SRAM DUB, press fit
Named archived component — verify dimensions
SRAM Eagle SX Eagle DUB, 30t
Component 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 →
- SuspensionAsk when the fork was last serviced. Check the stanchions for damage, look for oil at the seals and make sure the fork moves smoothly without bushing play.Evaluate the suspension →
- DrivetrainShift through the full range under light load, measure chain wear and inspect the cassette or freewheel teeth. Skipping or hesitation can indicate wear, poor adjustment or mismatched parts.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 →
Bike-specific inspection checklist 21 checks based on 6 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: 2020 Giant Fathom 29 2 · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: ALUXX SL-Grade Aluminum · Fork: Suntour Raidon XC LO-R (100mm, tapered, 15x110 QR) OR Giant Crest 34 Suspension Fork
Suspension
Evaluate the suspension →Archived: Fork: Suntour Raidon XC LO-R (100mm, tapered, 15x110 QR) OR Giant Crest 34 Suspension Fork
Drivetrain
Check drivetrain wear →Archived: Shifters: SRAM SX Eagle · Rear derailleur: SRAM SX Eagle · Crankset: SRAM Eagle SX Eagle DUB, 30t · Bottom bracket: SRAM DUB, press fit · Cassette: SRAM SX Eagle, 11x50 · Chain: SRAM SX Eagle
Brakes
Inspect the brakes →Archived: Brakes: Tektro HDM 275
Wheels and tires
Check wheels and tires →Archived: Rims: Giant XCT 29” tubeless ready sleeve-joint rim, 25mm inner width · Hubs: [F] Giant Tracker Performance Boost 15x110, sealed bearing [R] Giant Tracker Giant Sport Boost QR 141, loose ball · Front tire: [F] Maxxis Forekaster 2, , EXO/TR[R] Maxxis 29x2.35 Rekon Race, foldable, , EXO/T · Rear tire: [F] Maxxis Forekaster 2, , EXO/TR[R] Maxxis 29x2.35 Rekon Race, foldable, , EXO/T
Controls and contact points
Archived: Handlebar: Giant Connect Trail, 780x31.8, [GA 690] · Stem: Giant Contact · Seatpost: Giant Connect, 30.9 · Saddle: Giant custom · Pedals: platform
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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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.