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 | 608 mm published | 391 mm published | 71.5 ° derived | 73.1 ° derived | 577 mm derived | 423 mm derived | Not published | Not published | Not published | Not published | Not published | purple |
| 2 of 2 checks could not be independently verified — manufacturer did not publish the required geometry | ||||||||||||
| M | 582 mm published | 382 mm published | 71.0 ° derived | 73.7 ° derived | 554 mm derived | 423 mm derived | Not published | Not published | Not published | Not published | Not published | purple |
| 2 of 2 checks could not be independently verified — manufacturer did not publish the required geometry | ||||||||||||
| S | 556 mm published | 372 mm published | 70.5 ° derived | 74.3 ° derived | 531 mm derived | 423 mm derived | Not published | Not published | Not published | Not published | Not published | purple |
| 2 of 2 checks could not be independently verified — manufacturer did not publish the required geometry | ||||||||||||
| XL | 633 mm published | 401 mm published | 72.0 ° derived | 72.6 ° derived | 600 mm derived | 423 mm derived | Not published | Not published | Not published | Not published | Not published | purple |
| 2 of 2 checks could not be independently verified — manufacturer did not publish the required geometry | ||||||||||||
| XS | 531 mm published | 363 mm published | 70.0 ° derived | 75.0 ° derived | 508 mm derived | 423 mm derived | Not published | Not published | Not published | Not published | Not published | purple |
| 2 of 2 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 Jena specification is deliberately incomplete, omitting 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, BB drop) are simultaneously withheld, blocking any back-calculation path. The stack, reach, and wheelbase checks show 0.0mm deltas across all sizes (XS, S, M, L, XL), but these are trivial passes — the engine carried through published values because the withheld dimensions prevent independent geometric calculation. These results do not constitute genuine verification of the manufacturer's published geometry. 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.