Bombtrack Hook Gearing: Read the 46/30 and 11–36 Build
Bombtrack Hook gearing in the saved build uses two chainrings, 46 and 30 teeth, with an eleven-to-thirty-six-tooth ten-speed cassette. These endpoints describe the transmission more clearly than a broad GRX label. They also need to stay separate from the frame’s maximum-chainring entries, which describe another question.
Bombtrack Hook gearing starts with the supplied parts
The Shimano FC-RX600-10 crankset carries the 46/30 chainring entry. The cassette is CS-HG50, listed as ten-speed and 11–36T. Shifting controls are GRX ST-RX400 STI 2 × 10, accompanied by FD-RX400-F at the front and a clutched RD-RX400 rear derailleur. Those named parts form this published combination.
A reader comparing a changed bicycle can begin with the actual front tooth counts and cassette identification. Preserve any difference from this record. The source does not supply an intermediate sprocket sequence or a performance test, so it cannot predict which gear will suit a particular climb.
Frame clearance is not the original chainset
The technical table separately lists maximum two-chainring clearance as 48/32T with a 47 mm chainline. Its single-ring entry is 40T with a 45 mm chainline. These are conditional frame-clearance descriptions, not an alternative account of the supplied 46/30 crankset or permission for an unspecified conversion.
The different chainline qualifications matter as much as the tooth counts. A proposed single-ring system would need its own complete compatibility assessment. This source does not settle the required controls, chain retention or every other part of such a change.
A chain-length omission remains an omission
The chain row names KMC X10 EPT and prints XS–S 112, then L–XL 114L. It leaves M without a stated length. Do not quietly place Medium in either neighbouring group. The row is useful for recognising a gap in the specification, rather than prescribing a chain-cutting procedure.
The catalogue listing is Bombtrack Hook Bike — Metallic Black. Its five size labels make that missing Medium entry a real question to raise about the offered build. Keep the Bombtrack topic and existing introduction as broader context; the MY19 photograph does not verify this GRX combination.
FAQ
Is 48/32 the listed stock chainset?
No. The complete-build entry specifies 46/30 tooth counts.
Does the single-ring clearance use the same chainline?
No. Its stated qualification is 45 mm rather than 47 mm.
Which chain length does the source assign to Medium?
It supplies no Medium-specific length in that row.
Sources
The drivetrain list identifies the original 46/30 combination, while separate clearance rows qualify different tooth counts by chainline. 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.