Dura-Ace 7801 Cassette Assembly
After transferring a 11-21 Dura-Ace 10-sp cassette from a Dura-Ace WH-7801-SL to a Dura-Ace WH-7801 wheel, the backward spin of my chainring is a lot less.
When on the bike-stand, I used to spin my front chainring backwards (with my hand) for about 2 revolutions. Now, when I spin the new wheel backwards, it spins only .5 to .75 of a revolution.
Is there an obvious reason why it would spin less? I cleaned and reassembled the cassette according to the Shimano tech-document, placing the two black spacers in the correct position.
My only observation is that while you can only fit the rings onto the freewheel based on proper spline-alignment... the black spacers seemed as if they could be rotated, fitting in any number of alignments.
(on a casual ride, there were not apparent issues with shifting, noise, or performance... but the lack of spin of my new WH-7801 hub versus my old WH-7801-SL has me concerned. Thx.)