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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LG | 580 mm published | 401 mm published | 71.5 ° derived | 73.5 ° derived | 572 mm derived | 426 mm derived | 1045 mm published | 628 mm published | 70 mm derived | 64.7 mm derived | 50 mm published | green |
| All 4 consistency checks passed | ||||||||||||
| MD | 554 mm published | 391 mm published | 71.5 ° derived | 74.0 ° derived | 550 mm derived | 425 mm derived | 1025 mm published | 610 mm published | 70 mm derived | 64.7 mm derived | 50 mm published | green |
| All 4 consistency checks passed | ||||||||||||
| SM | 534 mm published | 378 mm published | 70.5 ° derived | 74.5 ° derived | 526 mm derived | 425 mm derived | 1014 mm published | 600 mm published | 70 mm derived | 71.3 mm derived | 50 mm published | green |
| All 4 consistency checks passed | ||||||||||||
| XL | 608 mm published | 414 mm published | 72.0 ° derived | 73.0 ° derived | 600 mm derived | 428 mm derived | 1064 mm published | 645 mm published | 70 mm derived | 61.5 mm derived | 50 mm published | green |
| All 4 consistency checks passed | ||||||||||||
| XS | 517 mm published | 376 mm published | 70.5 ° derived | 75.0 ° derived | 515 mm derived | 425 mm derived | 1007 mm published | 592 mm published | 70 mm derived | 71.3 mm derived | 50 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 Bianchi Impulso gravel geometry reconciles within ±1mm engineering tolerance across all five sizes for stack, reach, wheelbase, and front center. All checks pass, indicating that the manufacturer's published geometry is internally consistent with the RideDNA engine's forward-model calculations anchored to the published Effective Top Tube length.