The Rainbow Sprite autocycle constructed in 1950 as a prototype by Frank Rainbow,
seems to be the forerunner of the following year's Rainbow Joyrider. An extremely
comprehensive review of this machine appeared in the 6th July 1950 issue of
Motor Cycling magazine.
The twin tube frame consisted of a pair of tubes running down from the steering head below
the engine, then up and back alongside the rear wheel, cross tubes were welded at intervals
between the main tubes. Vertical tubes supported the saddle on a cantilever bracket, also
the rear carrier and mudguard. The cylindrical six-pint fuel tank was mounted behind the
headstock. At the front, Reynolds 531 tube formed the forks with rubber band suspension and
a 26" diameter cycle wheel, 1½" tyre. At the rear a 20" motorcycle wheel was fitted with a
2½" tyre which allowed for a low seat height.
| Specification |
| Engine |
Villiers Mk 2F two-stroke, Capacity 98cc.
47mm x 57mm |
| Transmission |
Two-speed with clutch. Handlebar lever
has "trigger" to hold clutch out. |
| Frame |
Twin tube with rigid rear. |
| Forks |
Single blade non-girder tube forks. Rubber band
undamped suspension. |
| Wheel rims |
Front 26" heavy duty cycle, Rear 20" motorcycle |
| Tyres |
Front 26" x 1½" Rear 20" x 2½" |
| Tank capacity |
6 pints |
| Brakes |
4" front & rear |
| Electrical |
Headlight 5½" diameter |
For further information about a second Rainbow prototype see the
Joyrider article.
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