Sizing and Geometry
Giant Reign
Sizing to be used as a reference only. The best way to determine your size is to visit us in-store and take the bike for a test-ride.
| Frame size | Rider height |
| S | 163-172cm |
| M | 171-180cm |
| L | 179-188cm |
| XL | 187-198cm |
Geometry
| S | M | L | XL | ||
|---|---|---|---|---|---|
| LOW | MID | HIGH | LOW | MID | HIGH | LOW | MID | HIGH | LOW | MID | HIGH | ||
| A | Seat Tube Length (mm) | 400 | 425 | 450 | 475 |
| A1 | Seat Post Insertion Depth (mm) | 257 | 383 | 308 | 333 |
| B | Seat Tube Angle | 78.3° | 78.7° | 79.0° | 78.3° | 78.7° | 79.0° | 77.3° | 77.7° | 78.0° | 77.3° | 77.7° | 78.0° |
| C | Top Tube Length (mm) | 556 | 555 | 555 | 587 | 586 | 585 | 620 | 620 | 619 | 652 | 652 | 651 |
| D | Head Tube Length (mm) | 100 | 105 | 115 | 120 |
| E | Head Tube Angle | 63.5° | 63.9° | 64.2° | 63.5° | 63.9° | 64.2° | 63.5° | 63.9° | 64.2° | 63.5° | 63.9° | 64.2° |
| F | Fork Rake (mm) | 44 | 44 | 44 | 44 |
| G | Trail (mm) | 140 | 138 | 135 | 140 | 138 | 135 | 140 | 138 | 135 | 140 | 138 | 135 |
| H | Wheelbase (mm) | 1214 | 1213 | 1212 | 1246 | 1245 | 1244 | 1271 | 1270 | 1269 | 1304 | 1303 | 1302 |
| I | Chain Stay Length (mm) | 445 | 443 | 442 | 445 | 443 | 442 | 445 | 443 | 442 | 445 | 443 | 442 |
| J | Bottom Bracket Drop (mm) | 35 | 30 | 25 | 35 | 30 | 25 | 35 | 30 | 25 | 35 | 30 | 25 |
| K | Stack (mm) | 627 | 624 | 622 | 632 | 629 | 626 | 641 | 638 | 635 | 645 | 642 | 639 |
| L | Reach (mm) | 426 | 430 | 434 | 456 | 460 | 464 | 476 | 480 | 484 | 506 | 510 | 514 |
| M | Stand Over Height (mm) | 723 | 727 | 732 | 743 | 747 | 752 | 756 | 760 | 765 | 771 | 777 | 782 |
| O | Stem Length (mm) | 40 | 40 | 40 | 40 |
| P | Crank Length (mm) | 165 | 170 | 170 | 170 |
| Q | Wheel Size | 29" | 29" | 29" | 29" |