BMC Kaius 2026 geometry

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.

BMC Kaius 2026 geometry chart

Source: Manufacturer geometry source

Published geometry by size

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.

SizeStackReachHTASTAETTChainstayWheelbaseFront centerBB dropTrailFork offsetAudit context
47 510 mm published390 mm published71.0 ° derived73.0 ° derived546 mm derived420 mm derived1003 mm published596 mm published80 mm derived68.0 mm published50 mm published green
All 5 consistency checks passed
51 530 mm published397 mm published71.0 ° derived73.0 ° derived559 mm derived420 mm derived1017 mm published610 mm published80 mm derived68.0 mm published50 mm published green
All 5 consistency checks passed
54 550 mm published401 mm published72.0 ° derived73.0 ° derived569 mm derived420 mm derived1015 mm published608 mm published80 mm derived68.0 mm published45 mm published green
All 5 consistency checks passed
56 570 mm published405 mm published72.0 ° derived73.0 ° derived579 mm derived420 mm derived1026 mm published619 mm published80 mm derived68.0 mm published45 mm published yellow
2 of 5 checks flagged — Wheelbase Reconciliation shows 2.4mm discrepancy
58 595 mm published410 mm published72.0 ° derived73.0 ° derived592 mm derived420 mm derived1039 mm published632 mm published80 mm derived68.0 mm published45 mm published yellow
1 of 5 checks flagged — Front Center Reconciliation shows 2.1mm discrepancy
61 620 mm published414 mm published72.0 ° derived73.0 ° derived604 mm derived420 mm derived1051 mm published644 mm published80 mm derived68.0 mm published45 mm published green
All 5 consistency checks passed

Audit context

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 BMC Kaius geometry reconciles well with the RideDNA forward model across all six sizes. Stack and reach show excellent agreement within ±1mm engineering tolerance across the entire size run. Wheelbase shows a 2.4mm data inaccuracy on size 56; front center shows 2.5mm and 2.1mm data inaccuracies on sizes 56 and 58 respectively. Trail reconciles within ±1mm engineering tolerance across all sizes.

Next steps

More BMC geometry profiles