2026 Specialized Aethos 2 Expert vs 2025 Basso SV Shimano Dura Ace

What changes on the Basso SV Shimano Dura Ace

Compared with the Specialized Aethos 2 Expert in 54, the Basso SV Shimano Dura Ace in 58 places the top of the head tube 50 mm higher and 5 mm further forward, relative to the bottom bracket. Its wheelbase is 7 mm longer, which can contribute to stability at speed.

Frame stack

+50 mm

Higher front end

Frame reach

+5 mm

Longer frame reach

Wheelbase

+7 mm

Longer: steadier at speed

Head angle

+1.0°

Steeper: sharper steering

Chainstays

n/a

One of the bikes has no number for this

The two frames

Only the Specialized Aethos 2 Expert is drawn. The Basso SV Shimano Dura Ace numbers we have for size 58 are missing the chainstay length.

Geometry side by side

Differences are the Basso SV Shimano Dura Ace minus the Specialized Aethos 2 Expert. Full charts: 2026 Specialized Aethos 2 Expert, 2025 Basso SV Shimano Dura Ace.

Where each sits in its class

Specialized Aethos 2 ExpertBasso SV Shimano Dura Ace

Each bike is ranked against the other road bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.

What each ships with

The stock build of each bike's first listed trim. Parts that match are dimmed.