Good to know: Configurable build
Configurable build (at least partly: the cockpit or bar width, for example). The stock build below is only one of the options.
Geometry ?
Pearson Forge 2026 geometry in sizes 1/49–5/58: stack 540–645 mm, reach 337–383 mm, head angle 70.2–72.5°.
| 1/49 | 2/52 | 3/54 | 4/56 | 5/58 | |
|---|---|---|---|---|---|
| Stack | 540 mm | 572 mm | 590 mm | 610 mm | 645 mm |
| Reach | 337 mm | 354 mm | 375 mm | 383 mm | 380 mm |
| Head angle | 70.2° | 71° | 72.5° | 72.5° | 72.5° |
| Seat angle | 74.5° | 74.5° | 74° | 74° | 74° |
| Seat tube (?) | 485 mm | 520 mm | 540 mm | 560 mm | 580 mm |
| Head tube | 130 mm | 161 mm | 173 mm | 194 mm | 230 mm |
| Top tube (effective) | 486 mm | 513 mm | 544 mm | 558 mm | 565 mm |
| BB drop | 75 mm | 75 mm | 72.5 mm | 72.5 mm | 72.5 mm |
| Chainstay | 408 mm | 408 mm | 408 mm | 408 mm | 408 mm |
| Wheelbase | 967 mm | 988 mm | 992 mm | 1006 mm | 1014 mm |
| Fork offset | 58 mm | 58 mm | 50 mm | 50 mm | 50 mm |
(?) by the seat tube length: the manufacturer doesn’t say whether it’s measured centre to centre (c-c) or centre to top (c-t).
Source: pearsoncycles.com, checked 13 Nov 2026 · bar position: worked out from published data
Stock build
I don’t have the build for each size yet.
Frames with similar geometry
Stack and reach within 12 mm of size 1/49 (stack 540 / reach 337 mm).
Stack and reach within 12 mm of size 2/52 (stack 572 / reach 354 mm).
Stack and reach within 12 mm of size 3/54 (stack 590 / reach 375 mm).
Stack and reach within 12 mm of size 4/56 (stack 610 / reach 383 mm).
Stack and reach within 12 mm of size 5/58 (stack 645 / reach 380 mm).
Spotted a mistake or a missing build? Let me know.
Are you the manufacturer, or do you sell this bike? I’m missing 2 values for this model’s stem and bars. Add them