Bombtrack Hook Bottom Bracket: T47 Shell and 24 mm Spindle
Bombtrack Hook bottom bracket information identifies a T47 frame interface with an 86.5 mm shell, alongside a bearing assembly intended for a 24 mm crank spindle. Those dimensions describe different parts of the assembly. Keeping the shell and spindle entries together gives a more useful starting point than searching for T47 alone.
Bombtrack Hook bottom bracket entries name the frame first
The saved frame specification describes double-butted Columbus Cromor tubing, ED coating and an 86.5 mm T47 shell. The technical table repeats the shell standard and width. That repetition supports the frame description in this record; it does not make every product carrying the T47 name an identified replacement.
The complete-build bottom-bracket line says Bombtrack T47 internal sealed BB for a 24 mm spindle. Its crankset row names Shimano GRX FC-RX600-10, also with a 24 mm spindle. The two entries therefore provide an assembly context that would be lost if only the frame’s shell width were copied.
Keep drivetrain measurements in their own fields
The same technical table gives a 47 mm chainline and 151 mm Q factor. These are separately labelled drivetrain dimensions. Neither is a substitute spindle diameter or shell width, and neither identifies an adapter or a bearing-cup part number for an unexamined bicycle.
When discussing a possible crank change, retain the proposed crank identity with the frame and installed bottom-bracket markings. A familiar spindle number still does not answer every matching question. The saved specification offers no removal method, installation torque or approval for a combination assembled from unrelated T47 products.
Match the offer to the saved build context
The catalogue listing is Bombtrack Hook Bike — Metallic Black. It identifies the local parent and its XS-to-XL options, while the manufacturer document describes the steel Hook build inspected in October. Confirm the supplied components where a particular offer or previous owner’s changes matter.
The historical Hook 2 MY19 photograph is a different documented example. Its frame appearance cannot authenticate a hidden bearing assembly. Use the Bombtrack background guide for family context and the model topic for related records, while preserving the three separate identifiers: T47 interface, 86.5 mm shell and 24 mm spindle.
FAQ
Does 86.5 mm describe the crank spindle?
No. It is the stated bottom-bracket shell width.
Which spindle diameter accompanies the named GRX crank?
The saved component record explicitly gives 24 mm.
Does the T47 label identify every replacement requirement?
No. The actual crank and complete bearing assembly still need identification.
Sources
The frame entry supplies the 86.5 mm T47 shell; the named bottom-bracket and crank rows identify a 24 mm spindle. See the manufacturer’s saved steel Hook record (https://bombtrack.com/products/bombtrack-hook), captured 26 October 2026 and reread 5 November 2026.
Photograph credits and permissions
Photograph 1
Original title: Bombtrack Hook 2 MY19
Creator: www.velo-radsport.de; creator URI: https://www.flickr.com/photos/velo-radsport/
Copyright notice: Embedded sRGB ICC profile notice: Copyright (c) 1998 Hewlett-Packard Company. This identifies the colour profile, not the photograph author; no separate photographer copyright notice was supplied in the inspected image metadata.
Original source URI: https://www.flickr.com/photos/velo-radsport/47821053362/
License / permission: CC BY-SA 2.0 Generic
License / permission URI: https://creativecommons.org/licenses/by-sa/2.0/
Modification notice: Source-offered 2600 × 1733 original JPEG retained byte for byte with EXIF, IPTC/Photoshop resources, XMP and ICC profile. No local crop, resize, recompression, colour edit or metadata removal. Source EXIF/XMP records Adobe Photoshop Elements 15.0 processing before retrieval.
Source disclaimer: Historical Bombtrack Hook 2 MY19 photograph; MY19 is supplied in the source title, not inferred from upload date. Related Bombtrack brand context only; not proof of the current named build, SKU colour, components, geometry, fit, compatibility, cargo capacity or condition. No endorsement is implied. CC BY-SA 2.0 applies to the unchanged photograph; retain attribution and notices, provide the license URI, and make adaptations available under an applicable share-alike license. No additional restrictions or warranties are implied; other rights may apply. Exact license name: Creative Commons Attribution-ShareAlike 2.0 Generic.