Holdsworth's 1976 catalogue lists the Professional, with 75° parallel angles in Reynolds 531 double-butted, and the Professional SL, a 12-speed in Reynolds 531 SL with 74° angles. The 1983 Professional used the Reynolds 531 Professional tube set.
Known components
Listed exactly as our confirmed sources give them, with the year and source for each. A part listed for one year or version may not apply to every bike, so check against yours.
Frame and fork
- Reynolds 531 double-butted1976 — Ebykr catalogue archive, pp.3–4
- Reynolds 531 SL1976 — Ebykr catalogue archive, pp.3–4
- Reynolds 531 Professional tube set1983 — Ebykr catalogue archive, p.3
Gears and drivetrain
- Professional SL: 12-speed1976 — Ebykr catalogue archive, pp.3–4
Catalogue appearances
| Year | Name as printed · model no. | Details | Source |
|---|---|---|---|
| 1976 | Professional / Professional SL | Professional: 75° parallel, Reynolds 531 double-butted. Professional SL: 12-speed, Reynolds 531 SL, 74° parallel. | Ebykr catalogue archive, pp.3–4 |
| 1983 | Professional | Reynolds 531 Professional tube set; 74° angles. | Ebykr catalogue archive, p.3 |
Specs are as printed in the catalogue. Years are when the model appears in a source, not exact production dates.
Got one of these? Be the first to add a photoWe only use photos sent by their owners. If you own a Holdsworth Professional, or a catalogue that lists it, send photos to [email protected]. Tell us if we may publish them, and we'll credit you (see our terms).
Sources
Last updated 19 October 2026. Every fact on this page comes from one of these.