Bianchi Arcadex geometry: Comparing Five Carbon Frame Sizes

Bianchi Arcadex geometry is more useful when the size columns are compared directly than when a rider starts with a familiar letter. The carbon supplement dated 18 November 2024 lists XS, SM, MD, LG and XL. Its drawing identifies horizontal reach as X and vertical stack as Y, giving a clear basis for comparing candidate frames.

Read the Bianchi Arcadex geometry progression

In the order XS, SM, MD, LG and XL, reach is 376, 383, 391, 402 and 410 mm. Stack is 544, 563, 584, 610 and 638 mm. Read each pair from the same size column: MD, for example, combines 391 mm reach with 584 mm stack rather than either neighbouring size's number.

The progression is uneven. Moving from SM to MD adds 8 mm of frame reach and 21 mm of stack; moving from MD to LG adds 11 mm and 26 mm respectively. These differences help explain why choosing the next letter is a change in both horizontal and vertical frame dimensions, not simply a longer bicycle.

Use the rest of the column to describe the frame

The chart gives wheelbases of 1020, 1034, 1044, 1059 and 1077 mm across those five sizes. Its C dimension is 430 mm from XS through LG, then 432 mm for XL. These are documented frame dimensions. They do not by themselves predict an individual rider's comfort, handling preference or required handlebar position.

Bring the candidate columns to a fit appointment alongside the dimensions and contact points of a bicycle that already works for you. Separate the frame comparison from later cockpit choices. Altering a stem does not change the chart's frame reach or stack, even though it can change where the rider's hands end up.

Avoid mixing charts from another Arcadex

Use the supplement's five size labels as printed. Do not silently replace SM with a numerical road size or borrow a height recommendation from a different Bianchi model. This table does not provide a rider-height-to-size rule, and the frame photo does not establish which column belongs to the pictured bicycle.

The source belongs to the documented carbon Arcadex platform; the historical photograph is older family context. A used listing carrying the Arcadex name may require an earlier chart. Ask for the frame's identity and relevant supplement before comparing its advertised size with these numbers, especially when a seller supplies only a letter.

FAQ

What are the MD reach and stack?

The supplement's MD column gives 391 mm reach and 584 mm stack. Keep both dimensions together when comparing the frame.

How much taller is LG than MD in this chart?

LG stack is 610 mm against MD's 584 mm, a 26 mm difference. Its reach also increases by 11 mm, from 391 to 402 mm.

Does the table identify the right size for my height?

No height recommendation is provided here. The chart supplies frame dimensions to support a fitting decision, rather than prescribing a size from height alone.

Frame dimensions are the starting point; the AeroFlare cockpit dimension guide addresses the next contact-point question. The Bianchi topic also links the other ownership references.

Sources: Bianchi carbon Arcadex supplement, 18 November 2024.