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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 420 | 512 mm published | 370 mm published | 70.8 ° derived | 75.5 ° derived | 505 mm derived | 408 mm derived | 971 mm published | 575 mm published | 74 mm derived | 73.2 mm published | 45 mm published | yellow |
| 4 of 5 checks flagged — Reach Reconciliation shows 2.9mm discrepancy | ||||||||||||
| 455 | 525 mm published | 375 mm published | 71.6 ° derived | 75.3 ° derived | 514 mm derived | 408 mm derived | 974 mm published | 577 mm published | 74 mm derived | 68.0 mm published | 45 mm published | green |
| All 5 consistency checks passed | ||||||||||||
| 485 | 543 mm published | 382 mm published | 72.5 ° derived | 74.8 ° derived | 526 mm derived | 408 mm derived | 979 mm published | 582 mm published | 72 mm derived | 62.2 mm published | 45 mm published | yellow |
| 3 of 5 checks flagged — Reach Reconciliation shows 3.1mm discrepancy | ||||||||||||
| 510 | 562 mm published | 387 mm published | 72.9 ° derived | 74.5 ° derived | 543 mm derived | 410 mm derived | 988 mm published | 589 mm published | 72 mm derived | 59.7 mm published | 45 mm published | green |
| All 5 consistency checks passed | ||||||||||||
| 530 | 580 mm published | 394 mm published | 72.9 ° derived | 73.8 ° derived | 563 mm derived | 410 mm derived | 1001 mm published | 602 mm published | 72 mm derived | 59.7 mm published | 45 mm published | green |
| All 5 consistency checks passed | ||||||||||||
| 550 | 599 mm published | 402 mm published | 72.9 ° derived | 73.5 ° derived | 577 mm derived | 412 mm derived | 1017 mm published | 615 mm published | 72 mm derived | 59.7 mm published | 45 mm published | yellow |
| 2 of 5 checks flagged — Reach Reconciliation shows 2.1mm discrepancy | ||||||||||||
| 570 | 619 mm published | 409 mm published | 72.9 ° derived | 73.3 ° derived | 591 mm derived | 412 mm derived | 1030 mm published | 628 mm published | 72 mm derived | 59.7 mm published | 45 mm published | yellow |
| 3 of 5 checks flagged — Reach Reconciliation shows 3.1mm discrepancy | ||||||||||||
Overall consistency: yellow. 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 Colnago C72 geometry audit shows systematic discrepancies across multiple dimensions. Reach shows 2.1–3.1mm data inaccuracies on sizes 420, 485, 550, and 570, while sizes 455, 510, and 530 reconcile within ±1mm engineering tolerance. Wheelbase exhibits the same pattern with 2.6–3.7mm data inaccuracies on the same four sizes. Front center shows 2.4–3.4mm data inaccuracies on sizes 420, 485, and 570. The RideDNA Geometry Engine reconciliation analysis reveals a systematic Stack mispublishing pattern: published Stack values appear inflated by approximately 1.5mm across all sizes relative to what the other published geometry parameters imply.