Giant Defy Advanced geometryRoad · 2027 · 6 sizes, from XS to XL
The Giant Defy Advanced is a road bike available in 6 sizes, from XS to XL. Stack ranges from 527 to 615 mm and reach from 369 to 402 mm. Its position sits between racing and endurance. All sizes share 420 mm chainstays.
What size Defy Advanced do I need?
Enter the stack and reach of a bike that fits you well and we will tell you which size is closest and how to set it up.
Enter your stack and reach to see which size fits you best.
Geometry chart by size
Measurements in mm and degrees, as published by Giant. The ones that matter most for choosing a size are in bold.
| Size | XS | S | M | ML | L | XL |
|---|---|---|---|---|---|---|
| Stack | 527 | 541 | 558 | 577 | 596 | 615 |
| Reach | 369 | 375 | 380 | 384 | 393 | 402 |
| Head tube length | 125 | 135 | 150 | 175 | 195 | 215 |
| Head angle | 70.5° | 71.8° | 72.5° | 72.5° | 72.5° | 72.5° |
| Chainstay length | 420 | 420 | 420 | 420 | 420 | 420 |
| Wheelbase | 995 | 994 | 998 | 1,010 | 1,025 | 1,040 |
| BB drop | 75 | 75 | 75 | 70 | 70 | 70 |
| Fork offset | 50 | 50 | 50 | 50 | 50 | 50 |
| Trail | 72 | 63 | 59 | 59 | 59 | 59 |
| Standover | 705 | 733 | 762 | 796 | 814 | 841 |
| Top tube (method not stated) | 515 | 530 | 545 | 560 | 575 | 595 |
| Seat tube (method not stated) | 410 | 445 | 480 | 515 | 535 | 565 |
| Seat angle (method not stated) | 74.5° | 74.0° | 73.5° | 73.0° | 73.0° | 73.0° |
Source: Giant official website · data from 11 Nov 2026. Spot a mistake?
Stack and reach of every size
Higher means a taller front end; further right means a longer reach. The blue dot is your search.
Character of each size
Compared with other road bikes. Further right means more of that quality.
Bikes with similar geometry (size M)
The closest size of other road models, by stack and reach.
Frequently asked questions
What size Defy Advanced do I need?
It depends on your position, not just your height. The most reliable way is to compare the stack and reach of a bike that fits you with those of each size (from 527/369 mm in size XS to 615/402 mm in size XL). The size finder on this page shows the closest size and the stem and spacers you would need.
What are the stack and reach of the Defy Advanced in size M?
Stack of 558 mm and reach of 380 mm.
Is the Defy Advanced a racing or an endurance bike?
In between. In size M its stack-to-reach ratio is at percentile 63 of road bikes: neither very low nor very tall.