Joined: May 2008
Posts: 10,106
Likes: 2,762
From: Fredericksburg, Va
Bikes: ? Proteous, '65 Frejus TDF, '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Veneto, '88 De Rosa Pro, '89 Pinarello Montello, 'Litespeed Catalyst'94 Burley Duet, 97 Specialized RockHopper, 2010 Langster
Of course it is the individuals need that drives the response. Mine is the need for a Campagnolo Super Record crown race used but in excellent condition. I may have one but haven't checked it out yet. The reason for obscurity is the fact that it often splits upon installation. Unlike the NR, it has much less material, with a lower profile. Why one is needed is due to having one that is split on my Colnago. The mechanism of failure can be as simple as having paint on the crown seat with the OD being at the limit of tolerance. Ping!
I mentioned this before, several years ago. I put the split on the back side of the crown, thinking that it would experience less force. Others have suggested that it be in the 3 or 4 o'clock position for a more uniform dynamic force. In any case, it is not felt when turning the fork so it continues to service well.
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Bikes don't stand alone. They are two tired.