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 | 610 mm published | 422 mm published | 70.0 ° derived | 74.0 ° derived | 599 mm derived | 423 mm derived | 1083 mm published | Not published | Not published | Not published | Not published | purple |
| 3 of 3 checks could not be independently verified — manufacturer did not publish the required geometry | ||||||||||||
| M | 586 mm published | 413 mm published | 70.0 ° derived | 74.0 ° derived | 583 mm derived | 423 mm derived | 1065 mm published | Not published | Not published | Not published | Not published | purple |
| 3 of 3 checks could not be independently verified — manufacturer did not publish the required geometry | ||||||||||||
| S | 562 mm published | 404 mm published | 70.0 ° derived | 74.5 ° derived | 562 mm derived | 423 mm derived | 1048 mm published | Not published | Not published | Not published | Not published | purple |
| 3 of 3 checks could not be independently verified — manufacturer did not publish the required geometry | ||||||||||||
| XL | 634 mm published | 431 mm published | 70.0 ° derived | 73.5 ° derived | 621 mm derived | 423 mm derived | 1101 mm published | Not published | Not published | Not published | Not published | purple |
| 3 of 3 checks could not be independently verified — manufacturer did not publish the required geometry | ||||||||||||
| XS | 538 mm published | 395 mm published | 70.0 ° derived | 75.0 ° derived | 542 mm derived | 423 mm derived | 1030 mm published | Not published | Not published | Not published | Not published | purple |
| 3 of 3 checks could not be independently verified — manufacturer did not publish the required geometry | ||||||||||||
Overall consistency: purple. 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 Wilier Adlar specification is deliberately incomplete — the manufacturer has withheld fork offset, fork axle-to-crown length (A2C), BB drop, front center, and trail. Front center and trail cannot be determined because all three core fork dimensions (offset, A2C, and BB drop) are simultaneously withheld, blocking any back-calculation path. The stack, reach, and wheelbase checks show 0.0mm deltas across all five sizes, but these are trivial passes — the engine carried through the published values because the withheld dimensions prevent independent geometric calculation. These results do not constitute genuine verification of the manufacturer's published geometry. The seat tube angle progression shows an unusually large step of +1.5° from XL (73.5°) to XS (75°) and −1.0° from XS to L (74°) — while STA normally decreases as frame size increases, a jump of this magnitude may indicate a transcription anomaly; the root cause cannot be determined from the published geometry data alone. By omitting these 5 dimensions, the manufacturer prevents independent scrutiny of its geometry claims and denies consumers the data they need to evaluate handling characteristics or make meaningful comparisons with competing models. These are not obscure technical figures — they are standard dimensions routinely published by competing manufacturers. This is a deliberate choice, not a technical limitation — the manufacturer possesses this information and has elected not to share it. Consumers cannot assess fit, predict handling, or compare this bicycle on equal terms without it. Transparency about geometry is not optional: it is the minimum standard a manufacturer owes to buyers making thousands-of-dollars purchasing decisions.