Velopedia Bicycle Archive
2021 Giant Propel Advanced Disc 1
Original manufacturer specifications including geometry for 6 published sizes.
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What Velopedia knows
- Model year
- 2021
- Category
- Road
- Original MSRP
- $4,980.00
- Sizes
- XS, S, M, ML, L, XL
- Colors
- Matte Carbon/Gloss Rainbow Black/Reflective Black
- Geometry
- 6 manufacturer sizes · Geometry context
- Record coverage
- 23 preserved details · 8 archived images · original MSRP · preserved geometry
- Archive ID
- 900002084
Frameset
| Frame Construction | Advanced-Grade Composite, disc |
|---|---|
| Frame Material | Carbon Fiber |
| Fork | Advanced-Grade Composite, hybrid OverDrive steerer, disc |
| Fork Material | Carbon Fiber |
| Rear Shock | N/A |
Drivetrain
| Shifters | Shimano Ultegra |
|---|---|
| Front Derailleur | Shimano Ultegra |
| Rear Derailleur | Shimano Ultegra |
| Crankset | Shimano Ultegra, 36/52 |
| Bottom Bracket | Shimano, press fit |
| Cassette | Shimano Ultegra, 11-speed, 11x30 |
| Chain | KMC X11EL-1 |
| Pedals | N/A |
Brakes
| Brakes | Shimano Ultegra hydraulic (F:160mm, R:140mm) |
|---|
Cockpit & Contact Points
| Handlebar | Giant Contact SL Aero |
|---|---|
| Stem | Giant Contact SL Aero |
| Saddle | Giant Approach, UniClip accessory mount |
| Seatpost | Giant Vector, composite |
Wheels & Tires
| Hubs | Giant SLR-2 Disc WheelSystem, 12mm thru-axle |
|---|---|
| Rims | Giant SLR 2 Carbon Disc WheelSystem ( F:42mm, R:65mm) |
| Spokes | Giant SLR-2 WheelSystem, DBL technology |
| Front Tire | Giant Gavia AC 1, tubeless, 700x25c, folding |
| Rear Tire | Giant Gavia AC 1, tubeless, 700x25c, folding |
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 | XS | S | M | ML | L | XL |
|---|---|---|---|---|---|---|
| Seat tube | 465 mm | 500 mm | 520 mm | 545 mm | 575 mm | 595 mm |
| Top tube | 515 mm | 535 mm | 550 mm | 570 mm | 580 mm | 605 mm |
| Head tube | 120 mm | 130 mm | 145 mm | 165 mm | 185 mm | 200 mm |
| Head-tube angle | 71° | 72.5° | 73° | 73° | 73° | 73° |
| Seat-tube angle | 74.5° | 73.5° | 73° | 73° | 73° | 72° |
| Chainstay / rear center | 405 mm | 405 mm | 405 mm | 405 mm | 405 mm | 405 mm |
| Wheelbase | 972 mm | 970 mm | 976 mm | 997 mm | 1007 mm | 1021 mm |
| Bottom-bracket drop | 70 mm | 68 mm | 68 mm | 65 mm | 65 mm | 65 mm |
| Reach | 372 mm | 378 mm | 383 mm | 398 mm | 402 mm | 412 mm |
| Stack | 517 mm | 529 mm | 545 mm | 562 mm | 581 mm | 595 mm |
| Standover height | 744 mm | 769 mm | 787 mm | 807 mm | 829 mm | 843 mm |
| Fork offset / rake | 45 mm | 45 mm | 45 mm | 45 mm | 45 mm | 45 mm |
| Trail | 70 mm | 60 mm | 57 mm | 57 mm | 57 mm | 57 mm |
| Crank length | 170 mm | 170 mm | 172.5 mm | 172.5 mm | 175 mm | 175 mm |
| Stem length | 80 mm | 90 mm | 100 mm | 110 mm | 110 mm | 120 mm |
| Handlebar width | 400 mm | 400 mm | 420 mm | 420 mm | 440 mm | 440 mm |
| Wheel size | 700C | 700C | 700C | 700C | 700C | 700C |
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
XS geometry
Archive context: The chainstay of 405 mm sits toward the shorter rear-center end. Its wheelbase of 972 mm sits toward the shorter end. Its reach of 372 mm sits somewhat shorter than typical.
Compared with 22 distinct road geometries in the XS-equivalent size cohort from model years 2017–2025 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 XS geometry S geometry
Archive context: Its wheelbase of 970 mm sits toward the shorter end. The chainstay of 405 mm sits toward the shorter rear-center end. The head angle of 72.5° sits somewhat steeper than typical.
Compared with 32 distinct road geometries in the Small-equivalent size cohort from model years 2017–2025 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 geometry M geometry
Archive context: Its wheelbase of 976 mm sits toward the shorter end. The chainstay of 405 mm sits toward the shorter rear-center end. Its trail of 57 mm sits toward the lower-trail end.
Compared with 35 distinct road geometries in the Medium-equivalent size cohort from model years 2017–2025 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 geometry ML geometry
Archive context: The chainstay of 405 mm sits toward the shorter rear-center end. Its trail of 57 mm sits toward the lower-trail end. Its bottom-bracket drop of 65 mm sits toward the shallower-drop end.
Compared with 35 distinct road geometries in the Medium-equivalent size cohort from model years 2017–2025 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 ML geometry L geometry
Archive context: The chainstay of 405 mm sits toward the shorter rear-center end. Its reach of 402 mm sits toward the longer end. Its bottom-bracket drop of 65 mm sits toward the shallower-drop end.
Compared with 28 distinct road geometries in the Large-equivalent size cohort from model years 2017–2025 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 geometry XL geometry
Archive context: The seat angle of 72° sits toward the more relaxed end. The chainstay of 405 mm sits toward the shorter rear-center end. Its bottom-bracket drop of 65 mm sits toward the shallower-drop end.
Compared with 24 distinct road 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 geometry Parts & serviceability
Find replacement parts
KMC X11EL-1
Exact archived model
Shimano Ultegra, 11-speed, 11x30
Interpreted as Shimano Ultegra · 11-speed Component family — verify exact version
Shimano Ultegra, 36/52
Named archived component — verify exact version
More qualified parts (3)
Shimano Ultegra
Interpreted as Shimano Ultegra · 11-speed Named component · published drivetrain speed — verify exact version
Before ordering: Confirm whether the drivetrain is mechanical or electronic before ordering.
Shimano Ultegra
Interpreted as Shimano Ultegra · 11-speed Named component · published drivetrain speed — verify exact version
Before ordering: Confirm whether the drivetrain is mechanical or electronic before ordering.
Shimano Ultegra
Interpreted as Shimano Ultegra · 11-speed Named component · published drivetrain speed — verify exact version
Before ordering: Confirm whether the drivetrain is mechanical or electronic before ordering.
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 →- FrameInspect the frame in bright light, especially around the head tube, bottom bracket, chainstays and clamped areas. Look for cracks, ripples, crushed sections or signs of a previous impact.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 11-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: 2021 Giant Propel Advanced Disc 1 · Road · Published sizes: XS, S, M, ML, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Advanced-Grade Composite, disc · Fork: Advanced-Grade Composite, hybrid OverDrive steerer, disc · Carbon Fiber
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano Ultegra · Front derailleur: Shimano Ultegra · Rear derailleur: Shimano Ultegra · Crankset: Shimano Ultegra, 36/52 · Bottom bracket: Shimano, press fit · Cassette: Shimano Ultegra, 11-speed, 11x30 · Chain: KMC X11EL-1
Brakes
Inspect the brakes →Archived: Brakes: Shimano Ultegra hydraulic (F:160mm, R:140mm)
Wheels and tires
Check wheels and tires →Archived: Rims: Giant SLR 2 Carbon Disc WheelSystem ( F:42mm, R:65mm) · Hubs: Giant SLR-2 Disc WheelSystem, 12mm thru-axle · Front tire: Giant Gavia AC 1, tubeless, 700x25c, folding · Rear tire: Giant Gavia AC 1, tubeless, 700x25c, folding
Controls and contact points
Archived: Handlebar: Giant Contact SL Aero · Stem: Giant Contact SL Aero · Seatpost: Giant Vector, composite · Saddle: Giant Approach, UniClip accessory mount
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.