The 1961 C. B. Cycles catalogue lists the Challenge in '531' tubing with Continental lugs, in 21½ to 23½in frames, as a single-, five- or ten-speed.
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
- '531' tubing1961 — Ebykr catalogue archive, p.4
- Continental lugs1961 — Ebykr catalogue archive, p.4
Gears and drivetrain
- single-, five- and ten-speed versions1961 — Ebykr catalogue archive, p.4
Catalogue appearances
| Year | Name as printed · model no. | Details | Source |
|---|---|---|---|
| 1961 | CHALLENGE | '531' tubing; Continental lugs; 21½–23½in; single-, five- and ten-speed versions. | Ebykr catalogue archive, p.4 |
Specs are as printed in the catalogue. Years are when the model appears in a source, not exact production dates.
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Sources
Last updated 19 October 2026. Every fact on this page comes from one of these.