
Velopedia Bicycle Archive
2015 Giant Defy 2
Original manufacturer specifications including geometry for 6 published sizes.
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What Velopedia knows
- Model year
- 2015
- Category
- Road
- Original MSRP
- $1,105.00
- Sizes
- XS, S, M, M/L, L, XL
- Colors
- Charcoal/White/Red
- Geometry
- 6 manufacturer sizes · Geometry context
- Record coverage
- 23 preserved details · archived image · original MSRP · preserved geometry
- Archive ID
- 900002528
Model history 3 other years
Frameset
| Frame Construction | ALUXX SL-grade aluminum |
|---|---|
| Frame Material | Aluminum |
| Fork | Composite, Alloy OverDrive steerer |
| Fork Material | Carbon Fiber |
| Rear Shock | N/A |
Drivetrain
| Shifters | Shimano Tiagra |
|---|---|
| Front Derailleur | Shimano Tiagra |
| Rear Derailleur | Shimano Tiagra |
| Crankset | Shimano Tiagra, 34/50 |
| Bottom Bracket | Sealed |
| Cassette | Shimano Tiagra 12x30, 10-speed |
| Chain | KMC X10 |
| Pedals | Caged w/ toe clip and strap |
Brakes
| Brakes | Tektro R312 |
|---|
Cockpit & Contact Points
| Handlebar | Giant Connect, 31.8mm |
|---|---|
| Stem | Giant Sport |
| Saddle | Giant Performance Road |
| Seatpost | Giant D-Fuse, Composite |
Wheels & Tires
| Hubs | Giant Tracker Sport Road, 26h |
|---|---|
| Rims | Giant S-R2 |
| Spokes | Stainless Steel, 14g |
| Front Tire | Giant S-R4, Front and rear specific, 700x25 |
| Rear Tire | Giant S-R4, Front and rear specific, 700x25 |
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/43.0 | S/46.5 | M/50.0 | M/L/53.5 | L/55.5 | XL/58.5 |
|---|---|---|---|---|---|---|
| Top tube | 515 mm | 530 mm | 545 mm | 560 mm | 575 mm | 1511.3 mm |
| Head tube | 125 mm | 145 mm | 165 mm | 185 mm | 205 mm | 571.5 mm |
| Head-tube angle | 71° | 72° | 72.5° | 72.5° | 72.5° | 72.5° |
| Seat-tube angle | 74° | 74° | 73.5° | 73° | 73° | 72.5° |
| Chainstay / rear center | 420 mm | 420 mm | 420 mm | 420 mm | 420 mm | 1066.8 mm |
| Wheelbase | 983 mm | 990 mm | 995 mm | 1007 mm | 1022 mm | 2633.98 mm |
| Reach | 365 mm | 373 mm | 377 mm | 381 mm | 390 mm | 398 mm |
| Stack | 523 mm | 545 mm | 566 mm | 585 mm | 604 mm | 623 mm |
| Standover height | 736.6 mm | 754.38 mm | 777.24 mm | 789.94 mm | 812.8 mm | 833.12 mm |
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/43.0 geometry
Archive context: The seat angle of 74° sits toward the more relaxed end. The head angle of 71° sits somewhat steeper than typical. Its wheelbase of 983 mm sits close to the middle of the group.
Compared with 13 distinct road geometries in the XS-equivalent size cohort from model years 2015–2017 in the Velopedia archive.S/46.5 geometry
Archive context: The head angle of 72° sits somewhat steeper than typical. Its wheelbase of 990 mm sits close to the middle of the group. The chainstay of 420 mm sits close to the middle of the group.
Compared with 13 distinct road geometries in the Small-equivalent size cohort from model years 2015–2017 in the Velopedia archive.M/50.0 geometry
Archive context: Its reach of 377 mm sits somewhat shorter than typical. Its wheelbase of 995 mm sits somewhat shorter than typical. The seat angle of 73.5° sits somewhat steeper than typical.
Compared with 17 distinct road geometries in the Medium-equivalent size cohort from model years 2015–2017 in the Velopedia archive.M/L/53.5 geometry
Archive context: Its wheelbase of 1007 mm sits somewhat shorter than typical. The seat angle of 73° sits close to the middle of the group. The chainstay of 420 mm sits close to the middle of the group.
Compared with 13 distinct road geometries in the Large-equivalent size cohort from model years 2015–2017 in the Velopedia archive.L/55.5 geometry
Archive context: The seat angle of 73° sits close to the middle of the group. The chainstay of 420 mm sits close to the middle of the group. The head angle of 72.5° sits close to the middle of the group.
Compared with 13 distinct road geometries in the Large-equivalent size cohort from model years 2015–2017 in the Velopedia archive.XL/58.5 geometry
Archive context: Its wheelbase of 2634 mm sits toward the longer end. The chainstay of 1066.8 mm sits toward the longer rear-center end. The seat angle of 72.5° sits somewhat more relaxed than typical.
Compared with 11 distinct road geometries in the XL-equivalent size cohort from model years 2015–2019 in the Velopedia archive.Parts & serviceability
Find replacement parts
More qualified parts (4)
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.Check wheels and tires →
Bike-specific inspection checklist 19 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: 2015 Giant Defy 2 · Road · Published sizes: XS, S, M, M/L, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: ALUXX SL-grade aluminum · Fork: Composite, Alloy OverDrive steerer · Carbon Fiber
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano Tiagra · Front derailleur: Shimano Tiagra · Rear derailleur: Shimano Tiagra · Crankset: Shimano Tiagra, 34/50 · Bottom bracket: Sealed · Cassette: Shimano Tiagra 12x30, 10-speed · Chain: KMC X10
Brakes
Inspect the brakes →Archived: Brakes: Tektro R312
Wheels and tires
Check wheels and tires →Archived: Rims: Giant S-R2 · Hubs: Giant Tracker Sport Road, 26h · Front tire: Giant S-R4, Front and rear specific, 700x25 · Rear tire: Giant S-R4, Front and rear specific, 700x25
Controls and contact points
Archived: Handlebar: Giant Connect, 31.8mm · Stem: Giant Sport · Seatpost: Giant D-Fuse, Composite · Saddle: Giant Performance Road · Pedals: Caged w/ toe clip and strap
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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Current market
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

