Mild, free-revving unit construction twin with similar problems to the 3TA – most people dumped the Bathtub rear end, which is now, inexplicably, desperately sought after. The kind of bike that sorts the men from the boys on bumpy country roads. Most of the dross has now expired, much on offer is well rebuilt, mildly modded and a sensible if touch boring way into the joys of British biking. Look out for 3TA’s converted to 500 spec.
1959-66 499cc (69x66mm) OHV twin 27hp, 90mph, 70mpg, 350lbs