Sizing and Geometry
Giant Fastroad
Sizing chart to be used as a reference only. The best way to determine your size is to visit us in-store and get fitted.
| Frame size | Rider Height | Rider Height (cm) |
| XS | 5'1"-5'3" | 155-165 |
| S | 5'3"-5'7" | 160-170 |
| M | 5'7"-5'11" | 170-180 |
| L | 5'11"-6'3" | 180-190 |
| XL | 6'3"-6'7" | 190-200 |
Geometry
| XS | S | M | ML | L | XL | ||
|---|---|---|---|---|---|---|---|
| A | Seat Tube Length (mm) | 435 | 455 | 475 | 495 | 525 | 555 |
| B | Seat Tube Angle | 73.5° | 73.5° | 73.5° | 73.0° | 73.0° | 73.0° |
| C | Top Tube Length (mm) | 545 | 560 | 575 | 590 | 610 | 630 |
| D | Head Tube Length (mm) | 110 | 130 | 155 | 175 | 200 | 225 |
| E | Head Tube Angle | 70.5° | 70.5° | 71.0° | 71.0° | 71.5° | 71.5° |
| F | Fork Rake (mm) | 50 | 50 | 50 | 50 | 50 | 50 |
| G | Trail (mm) | 73.7 | 73.7 | 70.4 | 70.4 | 67.1 | 67.1 |
| H | Wheelbase (mm) | 1031 | 1047 | 1058 | 1069 | 1084 | 1105 |
| I | Chain Stay Length (mm) | 435 | 435 | 435 | 435 | 435 | 435 |
| J | Bottom Bracket Drop (mm) | 75 | 75 | 75 | 75 | 75 | 75 |
| K | Stack (mm) | 533 | 552 | 578 | 597 | 623 | 646 |
| L | Reach (mm) | 387 | 396 | 404 | 407 | 419 | 432 |
| M | Stand Over Height (mm) | 718 | 736 | 756 | 773 | 800 | 826 |
| O | Stem Length (mm) | 70 | 80 | 90 | 90 | 100 | 110 |
| P | Crank Length (mm) | 170 | 170 | 170 | 172.5 | 172.5 | 172.5 |
| Q | Wheel Size | 700C | 700C | 700C | 700C | 700C | 700C |