A size-by-size geometry profile with manufacturer provenance and RideDNA consistency-audit context. Use the complete table to compare fit and handling before opening the interactive tools.
Source: Manufacturer geometry source
Provenance: published is present in the manufacturer data; derived is calculated by RideDNA; manual is a staff-entered reference rather than a manufacturer-chart value. “Not published” means the manufacturer did not provide a value for that size.
| Size | Stack | Reach | HTA | STA | ETT | Chainstay | Wheelbase | Front center | BB drop | Trail | Fork offset | Audit context |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L | 571 mm published | 399 mm published | 73.0 ° derived | 73.3 ° derived | 570 mm derived | 410 mm derived | 1004 mm published | 603 mm published | 68 mm derived | 57.2 mm derived | 45 mm published | green |
| All 4 consistency checks passed | ||||||||||||
| M | 551 mm published | 388 mm published | 72.5 ° derived | 73.5 ° derived | 550 mm derived | 410 mm derived | 991 mm published | 591 mm published | 68 mm derived | 60.3 mm derived | 45 mm published | green |
| All 4 consistency checks passed | ||||||||||||
| S | 530 mm published | 383 mm published | 72.0 ° derived | 74.0 ° derived | 535 mm derived | 410 mm derived | 985 mm published | 584 mm published | 68 mm derived | 63.5 mm derived | 45 mm published | green |
| All 4 consistency checks passed | ||||||||||||
| XL | 591 mm published | 404 mm published | 73.3 ° derived | 73.0 ° derived | 585 mm derived | 410 mm derived | 1012 mm published | 612 mm published | 68 mm derived | 55.3 mm derived | 45 mm published | green |
| All 4 consistency checks passed | ||||||||||||
| XS | 509 mm published | 379 mm published | 71.0 ° derived | 74.5 ° derived | 520 mm derived | 410 mm derived | 993 mm published | 593 mm published | 68 mm derived | 59.2 mm derived | 55 mm published | green |
| All 4 consistency checks passed | ||||||||||||
| XXS | 504 mm published | 370 mm published | 71.0 ° derived | 75.0 ° derived | 505 mm derived | 410 mm derived | 983 mm published | 582 mm published | 68 mm derived | 59.2 mm derived | 55 mm published | green |
| All 4 consistency checks passed | ||||||||||||
Overall consistency: green. This context is shown alongside the table so a rider can distinguish a complete published specification from a value that RideDNA had to derive or could not independently verify.
The Ribble ULTRA-RACE geometry reconciles within ±1mm engineering tolerance across all six sizes for stack, reach, wheelbase, and front center. The manufacturer's published specification is internally consistent with the RideDNA engine's forward-model calculations. The RideDNA Geometry Engine reconciliation checks confirm internal geometric consistency across all sizes, with all five back-calculation checks passing green.