Ragley Blue Pig Headset and Bottom Bracket: Read the 2021 Frame

2026-10-28

Ragley Blue Pig headset and bottom bracket searches are easier when the frame year is confirmed first. The 2021 frame specification identifies a ZS44/28.6 | EX44/40 headset interface and a 73mm BSA bottom-bracket shell. These are frame records, not a complete shopping list. The actual fork and crank must also be identified before discussing a compatible assembly.

Green historical Ragley mmmBOP bicycle beside a stone wall — Historical Ragley mmmBOP owner-build photograph by Dave Haygarth, CC BY 2.0; uploaded to Flickr on 11 July 2010. The source describes the build as “Almost built up... enough for a quick spin anyway”. This is not the Blue Pig model discussed below and does not verify its equipment or a completed assembly. No endorsement implied. Photograph source (https://www.flickr.com/photos/minnellium/4783551445/)

Ragley Blue Pig headset and bottom bracket: Preserve the full headset designation

The standard complete bike lists a Nukeproof headset with the same ZS44/28.6 | EX44/40 designation and a Ragley top cap. Keep both halves of that notation in a replacement enquiry. Calling the frame simply “44mm” loses information that the manufacturer supplies in the more detailed row. A matching headline diameter is not enough to approve every headset bearing or assembly.

The original Yari fork row describes a tapered steerer. If the fork has changed, provide its actual identification rather than assuming the original assembly remains in place. Photographs of the fitted parts and any existing part references can help a workshop establish what needs replacement. The archived headset line does not specify a service procedure or a universal bearing replacement code.

Distinguish a shell standard from a crank system

The frame table gives 73mm BSA for the bottom bracket. It does not, by itself, identify a fitted crank spindle or a complete bottom-bracket product. A used frame may arrive with a different crank from its original build. Keep the shell description, crank model and existing bottom-bracket markings as separate entries so an adviser can assess the complete combination.

The same frame section lists ISCG 05 tabs, while the standard complete-bike specification marks the chain guide N/A. Those statements can coexist: a frame can provide tabs without a guide being listed as original equipment. They do not approve any particular guide, chainring arrangement or spacer combination. Ask about the intended parts as a complete system rather than treating mount presence as blanket compatibility.

Order from confirmed identities

A useful frame-build enquiry includes the model year, frame size, fork identity, crank identity and the exact part that is missing or worn. State whether you are restoring an original setup or building a different one. The manufacturer table can supply the starting interfaces, but unsupported bearing dimensions, torque settings and assembly sequences should not be filled in from general memory.

Use the Ragley topic to navigate the brand and the Ragley introduction to place the frame in its family. Have unresolved interface questions answered before purchase or installation. Keeping the resulting confirmed part references with the frame helps future servicing without pretending the archived specification describes every later owner-built bicycle.

FAQ

What bottom-bracket shell does the 2021 frame list?

A 73mm BSA shell; the actual crank and bottom-bracket model require separate identification.

Does the frame include a chain guide because it has ISCG 05 tabs?

The tabs are listed, but the complete bike’s chain-guide entry says N/A.

Can the headset be ordered only from “44mm head tube”?

Retain the complete ZS44/28.6 | EX44/40 designation and confirm the actual fork and replacement assembly.

Sources

Decode the 2021 Blue Pig’s published headset, threaded bottom-bracket shell and chain-guide mount entries before assembling a parts enquiry. Sources checked 28 October 2026: 2021 standard Blue Pig record (https://www.ragleybikes.com/products/blue-pig-hardtail-bike-2021).

Photograph credits and permissions

Photograph 1

Original title: Ragley mmmBOP

Creator: Dave Haygarth; creator URI: https://www.flickr.com/people/minnellium/

Original source URI: https://www.flickr.com/photos/minnellium/4783551445/

License / permission: CC BY 2.0 Generic

License / permission URI: https://creativecommons.org/licenses/by/2.0/

Modification notice: Flickr-provided 1600 × 1064 JPEG rendition of the 3008 × 2000 original. No further crop, colour editing, re-encoding or metadata removal by this publisher; existing source colour treatment retained.