
Velopedia Bicycle Archive
2020 Giant Fathom E+ 3 Power
Original manufacturer specifications including geometry for 4 published sizes.
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What Velopedia knows
- Model year
- 2020
- Category
- Mountain
- Original MSRP
- $2,700.00
- Sizes
- XS, S, M, L, XL
- Colors
- Matte Black / Silver
- Geometry
- 4 manufacturer sizes · Geometry context
- Record coverage
- 22 preserved details · archived image · original MSRP · preserved geometry
- Archive ID
- 900002215
Frameset
| Frame Construction | ALUXX aluminum, Overdrive 1½ - 1⅛" head tube, 141mm Boost QR, integrated KS18 kickstand mount |
|---|---|
| Frame Material | Aluminum |
| Fork | SR Suntour XCM 32 NLO DS 15AH-110, 27.5 120mm travel, Tapered 1½ - 1⅛" steerer, lockout |
| Rear Shock | N/A |
Drivetrain
| Shifters | Shimano SL-M2000 |
|---|---|
| Front Derailleur | - |
| Rear Derailleur | Shimano Deore, 9-Speed, Shadow design |
| Crankset | Forged Alloy minimal Q-factor, 36T Steel Direct Mount ring |
| Bottom Bracket | N/A |
| Cassette | Shimano CS-HG200, 11-36T, 9-Speed |
| Chain | KMC e.9 Sport |
| Pedals | Aluminum Platform |
Brakes
| Brakes | Tektro HD-M285, hydraulic disc, 180mm |
|---|
Cockpit & Contact Points
| Handlebar | Giant Connect TR Riser 31.8x750mm |
|---|---|
| Stem | Giant Contact |
| Saddle | Giant Sport |
| Seatpost | Giant 30.9mm, 2-bolt Micro Adjustable, Forged Aluminium |
Wheels & Tires
| Hubs | Giant eTracker Sport, [F] 15mm Thru-Axle [R] 141mm QR |
|---|---|
| Rims | Giant AM 27.5, Tubeless ready, 30mm inner width |
| Spokes | Stainless steel |
| Front Tire | Maxxis Forekaster 27.5x2.6, foldable, 60 TPI, EXO, Tubeless ready |
| Rear Tire | Maxxis Forekaster 27.5x2.6, foldable, 60 TPI, EXO, Tubeless ready |
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 | 405 mm | 455 mm | 505 mm | 535 mm |
| Top tube | 575 mm | 595 mm | 615 mm | 635 mm |
| Head tube | 110 mm | 115 mm | 140 mm | 150 mm |
| Head-tube angle | 68° | 68° | 68° | 68° |
| Seat-tube angle | 73° | 73° | 73° | 73° |
| Chainstay / rear center | 470 mm | 470 mm | 470 mm | 470 mm |
| Wheelbase | 1135 mm | 1156 mm | 1178 mm | 1199 mm |
| Bottom-bracket drop | 45 mm | 45 mm | 45 mm | 45 mm |
| Reach | 386 mm | 405 mm | 417 mm | 435 mm |
| Stack | 617 mm | 622 mm | 645 mm | 654 mm |
| Standover height | 753 mm | 760 mm | 787 mm | 791 mm |
| Fork offset / rake | 46 mm | 46 mm | 46 mm | 46 mm |
| Trail | 100.7 mm | 100.7 mm | 100.7 mm | 100.7 mm |
| Crank length | 165 mm | 170 mm | 170 mm | 170 mm |
| Stem length | 50 mm | 60 mm | 60 mm | 70 mm |
| Handlebar width | 780 mm | 780 mm | 780 mm | 780 mm |
| Wheel size | 27.5+ | 27.5+ | 27.5+ | 27.5+ |
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: Its reach of 386 mm sits toward the shorter end. The seat angle of 73° sits toward the more relaxed end. Its stack of 617 mm sits somewhat taller than typical.
Compared with 19 distinct electric-assist geometries in the Small-equivalent size cohort from model years 2020–2022 in the Velopedia archive.M geometry
Archive context: Its reach of 405 mm sits toward the shorter end. The seat angle of 73° sits toward the more relaxed end. The chainstay of 470 mm sits somewhat longer than typical.
Compared with 18 distinct electric-assist geometries in the Medium-equivalent size cohort from model years 2020–2022 in the Velopedia archive.L geometry
Archive context: Its stack of 645 mm sits toward the taller end. Its reach of 417 mm sits toward the shorter end. The seat angle of 73° sits somewhat more relaxed than typical.
Compared with 19 distinct electric-assist geometries in the Large-equivalent size cohort from model years 2020–2022 in the Velopedia archive.XL geometry
Archive context: Its reach of 435 mm sits toward the shorter end. The seat angle of 73° sits somewhat more relaxed than typical. Its wheelbase of 1199 mm sits somewhat shorter than typical.
Compared with 15 distinct electric-assist geometries in the XL-equivalent size cohort from model years 2020–2022 in the Velopedia archive.Parts & serviceability
Find replacement parts
More qualified parts (3)
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. Velopedia may also earn from qualifying retailer 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 →
- BrakesBoth levers should feel firm and return cleanly. Check for fluid around the levers and calipers, inspect pad thickness and contamination, and look for worn or bent rotors.Inspect the brakes →
- E-bike systemConfirm the main battery charges with the correct charger, locks securely into its mount and has no case damage, swelling, corrosion or overheating marks. Power the bike on from cold, test every assist mode and ask for available battery-health and diagnostic records.Check the battery and electronics →
- 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 →
- 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 25 checks based on 7 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 E+ 3 Power · Electric-assist · Published sizes: XS, S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: ALUXX aluminum, Overdrive 1½ - 1⅛" head tube, 141mm Boost QR, integrated KS18 kickstand mount · Fork: SR Suntour XCM 32 NLO DS 15AH-110, 27.5 120mm travel, Tapered 1½ - 1⅛" steerer, lockout
Suspension
Evaluate the suspension →Archived: Fork: SR Suntour XCM 32 NLO DS 15AH-110, 27.5 120mm travel, Tapered 1½ - 1⅛" steerer, lockout
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano SL-M2000 · Front derailleur: - · Rear derailleur: Shimano Deore, 9-Speed, Shadow design · Crankset: Forged Alloy minimal Q-factor, 36T Steel Direct Mount ring · Cassette: Shimano CS-HG200, 11-36T, 9-Speed · Chain: KMC e.9 Sport
Brakes
Inspect the brakes →Archived: Brakes: Tektro HD-M285, hydraulic disc, 180mm
Wheels and tires
Check wheels and tires →Archived: Rims: Giant AM 27.5, Tubeless ready, 30mm inner width · Hubs: Giant eTracker Sport, [F] 15mm Thru-Axle [R] 141mm QR · Front tire: Maxxis Forekaster 27.5x2.6, foldable, 60 TPI, EXO, Tubeless ready · Rear tire: Maxxis Forekaster 27.5x2.6, foldable, 60 TPI, EXO, Tubeless ready
Controls and contact points
Archived: Handlebar: Giant Connect TR Riser 31.8x750mm · Stem: Giant Contact · Seatpost: Giant 30.9mm, 2-bolt Micro Adjustable, Forged Aluminium · Saddle: Giant Sport · Pedals: Aluminum Platform
E-bike system
Check the battery and electronics →Archived: Giant Fathom E+ 3 Power · electric-assist identification
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.




