Geometry ?
Author Ronin 2025 geometry in sizes 500–580: stack 562–642 mm, reach 374–393 mm, head angle 70.5–72°.
| 500 | 520 | 540 | 560 | 580 | |
|---|---|---|---|---|---|
| Stack | 562 mm | 583 mm | 601 mm | 617 mm | 642 mm |
| Reach | 374 mm | 378 mm | 382 mm | 390 mm | 393 mm |
| Head angle | 70.5° | 71° | 71° | 71.5° | 72° |
| Seat angle | 74.5° | 74° | 73.5° | 73° | 72.5° |
| Seat tube (c-t) | 500 mm | 520 mm | 540 mm | 560 mm | 580 mm |
| Head tube | 120 mm | 140 mm | 160 mm | 180 mm | 200 mm |
| BB drop | 70 mm | 70 mm | 69 mm | 68 mm | 68 mm |
| Chainstay | 425 mm | 425 mm | 425 mm | 425 mm | 425 mm |
| Wheelbase | 1015 mm | 1021 mm | 1032 mm | 1042 mm | 1046 mm |
| Fork length | 408 mm | 408 mm | 408 mm | 408 mm | 408 mm |
| Fork offset | 45 mm | 45 mm | 45 mm | 45 mm | 45 mm |
Source: cz.author.eu, checked 13 Nov 2026 · bar position: worked out from published data
Older model years in the archive with the same stack, reach and head angle: 2021–2024, 2026. Source: author.eu
Stock build
I don’t have the build for each size yet.
Frames with similar geometry
Stack and reach within 12 mm of size 500 (stack 562 / reach 374 mm).
Stack and reach within 12 mm of size 520 (stack 583 / reach 378 mm).
Stack and reach within 12 mm of size 540 (stack 601 / reach 382 mm).
Stack and reach within 12 mm of size 560 (stack 617 / reach 390 mm).
Stack and reach within 12 mm of size 580 (stack 642 / reach 393 mm).
Spotted a mistake or a missing build? Let me know.
Are you the manufacturer, or do you sell this bike? I’m missing 7 values for this model’s stem and bars. Add them