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@M_V
I'm still saying that its coz in the world of NJS, Octalink is high tech and that will make it the group/crankset of choice for many keirin racers.
The cost and time of creating a HT2 track crankset might be negligible but there'd probably be a large cost in getting it NJS approved and Shimano possibly see the keirin market as a good earner.
Also, is anyone (that matters - ie national teams) really buying external bearing cranksets as an upgrade to DA anyway or is the only real upgrade a move to a proprietary system like the Looks use?
Hoy would have been on 7710s at the last Olympics, that must sell a shit load of cranks and if you're still churning out cranks that you did all the design and R&D for, what, 14(?) years ago, why invest a penny in a replacement?