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 ?
Ribble Ultra SL 2026 geometry in sizes XS–XL: stack 506–583 mm, reach 379–410 mm, head angle 72–73.5°.
| XS | S | M | L | XL | |
|---|---|---|---|---|---|
| Stack | 506 mm | 523 mm | 545 mm | 564 mm | 583 mm |
| Reach | 379 mm | 385 mm | 392 mm | 401 mm | 410 mm |
| Head angle | 72° | 73° | 73° | 73.5° | 73.5° |
| Seat angle | 75° | 74° | 73.5° | 73.3° | 73.3° |
| Seat tube (?) | 470 mm | 500 mm | 520 mm | 540 mm | 560 mm |
| Head tube | 105 mm | 120 mm | 140 mm | 160 mm | 180 mm |
| BB drop | 69 mm | 69 mm | 69 mm | 69 mm | 69 mm |
| Chainstay | 410 mm | 410 mm | 410 mm | 410 mm | 410 mm |
| Wheelbase | 981 mm | 975 mm | 985 mm | 999 mm | 1014 mm |
| Fork offset | 53 mm | 45 mm | 45 mm | 45 mm | 45 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: ribblecycles.co.uk, checked 13 Nov 2026 · bar position: worked out from published data
An older model year in the archive with the same stack, reach and head angle: 2023. Source: bikeradar.com
Stock build
I don’t have the build for each size yet.
Frames with similar geometry
Stack and reach within 12 mm of size XS (stack 506 / reach 379 mm).
Stack and reach within 12 mm of size S (stack 523 / reach 385 mm).
Stack and reach within 12 mm of size M (stack 545 / reach 392 mm).
Stack and reach within 12 mm of size L (stack 564 / reach 401 mm).
Stack and reach within 12 mm of size XL (stack 583 / reach 410 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