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The stem on this bike is quite unusal for a bike from 1974. Tom used a "clamp on"
stem that offered a lightweight alternative to the quill-type stem. While still
using a standard threaded headset, an extension to the steerer is brazed into the fork steerer,
and the stem clamps to it. This style of clamping bars is common on Tom's early mountain bikes
(see pic).
Unfortunately the idea for the stem was not patented, and nearly 20 years later this style of
stem became the norm.
Tom later went on to design a true threadless headset for a time trail bike that he built
for himself. The headset did not use a star-nut, but was a true threadless design and included
sealed bearings, which was also highly unusal in the '70s. Several years later, when Dia-Compe
patent the threadless design, Tom was unable to produce his original design, and therefore not
able to show prior use.
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