Size Chart - Ridley Helium SLA 2019
| XXXS (41) | XXS (48) | XS (51) | S (54) | M (57) | L (60) | XL (63) | |
|---|---|---|---|---|---|---|---|
| (A) Max Saddle Height | 685 | 745 | 775 | 805 | 835 | 865 | 895 |
| (B) Seat Tube | 390 | 450 | 480 | 510 | 540 | 570 | 600 |
| (C) Top Tube - Effective | 500 | 515 | 525 | 545 | 565 | 585 | 600 |
| (D) Head Tube Length | 107 | 107 | 127 | 142 | 172 | 202 | 227 |
| (E) Seat Tube Angle | 75.5 | 75.0 | 74.0 | 73.5 | 73.0 | 72.5 | 72.5 |
| (F) Head Tube Angle | 70.0 | 71.8 | 72.0 | 73.0 | 73.5 | 73.5 | 74.0 |
| (G) Chainstay Length | 405 | 405 | 405 | 405 | 405 | 408 | 408 |
| (H) BB Drop | 67.1 | 68 | 68 | 66 | 66 | 63 | 63 |
| (I) Wheelbase | 976 | 970 | 970 | 977 | 987 | 1005 | 1014 |
| (J) Standover Height | 694 | 726 | 751 | 774 | 804 | 834 | 861 |
| (S) Stack | 500 | 507 | 527 | 543 | 573 | 599 | 625 |
| (R) Reach | 371 | 379 | 374 | 384 | 390 | 396 | 403 |