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08-10-10, 09:40 PM
Just curious, given a Shimano Dura-Ace 8-, 9-, or 10-speed downtube shifter, could you make it shift one of the other number of speeds by changing just the SIS unit?
This (http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/SL/EV-SL-7700-1663_v1_m56577569830611817.pdf) Shimano tech doc for 7700 9-speed or 8-speed* downtube shifters looks a lot like this (http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/SL/EV-SL-7800-2281A_v1_m56577569830609197.pdf) one for 7800 10-speed levers. I'm no mechanic, but it looks like the SIS units are interchangeable, and you can buy them here (http://www.madison.co.uk/searchresults.aspx?style=0&kw=sis%20unit) for $30 - $50.
*I thought 7700 was only 9-speed, so I'm a little confused about the tech doc saying 8-speed.
I don't plan on doing this, it just crossed my mind that it might be possible.
This (http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/SL/EV-SL-7700-1663_v1_m56577569830611817.pdf) Shimano tech doc for 7700 9-speed or 8-speed* downtube shifters looks a lot like this (http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/SL/EV-SL-7800-2281A_v1_m56577569830609197.pdf) one for 7800 10-speed levers. I'm no mechanic, but it looks like the SIS units are interchangeable, and you can buy them here (http://www.madison.co.uk/searchresults.aspx?style=0&kw=sis%20unit) for $30 - $50.
*I thought 7700 was only 9-speed, so I'm a little confused about the tech doc saying 8-speed.
I don't plan on doing this, it just crossed my mind that it might be possible.