Dave Larrington said:TheGreatGatsby said:The Headshok is the biggest con in the world. You can only get it serviced by a Cannondale
dealer and they cost £50 each time.
As a matter of purely academic interest, what is so clever about the internals of the Cannondale
Headshok? I've recently pulled apart, serviced and reassembled the outwardly Univega-built
"Concept" boinger on the front end of my Speedmachine with the only difficulty being determining
the corrcted method of reseating the lower "headset" bearing in the bottom of the head tube
(answer from HP Velotechnik: clout it...)
The core of a headshock suspension mechanism (whether Lefty or Fatty) is an octagonal linear bearing
with a roller bearing cage running on four sides (obviously, every second side has a race). Both the
static part and the moving part have four flat bearing surfaces. When disassembling the mechanism it
is apparently quite easy to lose rollers out of the races if you're not careful.
This is unlike virtually any other bicycle suspension unit, almost all of which have plain bushes
rather than bearings. The reason is that the mechanism has to transmit rotational (steering)
movements while damping linear movements.
The USE Sub fork, the only other monoblade front suspension unit I'm aware of, transfers the
steering movement through the heavily-knucked cantilever arm and is mechanically much simpler. It's
a better technical design than the Lefty for a number of reasons, but it's also fearsomely more
expensive.
Simon, who plans to upgrade his Lefty to a Sub as soon as he can afford it...
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[email hidden] (Simon Brooke) jasmine.org.uk~simonOpen ↗
Morning had broken, and we had run out of gas for the welding torch.