Originally Posted by mud
In my organization, UMTA, we just have a vintage class... Not specific to pre-65, or otherwise.
Actually the pre-65 designation for bikes such as the Ariel mentioned here is spot on. In fact the origin of that class name is directly attributable to Sammy Miller's move from the Ariel GOV 132 to Bultaco in mid 1964. In typical form he won his last event on the Ariel on a Saturday and first on the Bultaco on a Sunday. The highly modified Ariel was THE classic early sixties four stroke trials bike (along with a couple other types such as the AJS pictured) and to answer the purists, there was NO production version of it (or any Ariel four strokes) after 1958....which was the very reason Miller was allowed to modify it so extensively. When Miller left there was no Ariel factory name at all to ride for, after the BSA parent group pulled the plug on a short-lived run of two stroke street bikes built under that name in the early sixties.
There is a pre-60
trials movement in the UK that caters to those true 1950's heavyweight production trials bikes...but "pre-65" is quite accurate for the "Millerized" Ariel as shown here earlier. Whether a fuel-injected, monoshock, disc-braked Triumph Tiger Cub with an alloy perimeter frame qualifies is a matter for debate of course!