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PostPosted: Tue May 29, 2012 11:48 am 
Old School Hero

Joined: Wed Dec 01, 2010 11:27 pm
Posts: 198
I found some Dura Ace 7700 9 Speed downtube shifters for sale at a very good price, cheaper than the 8 speed version I actually need.

My bike has dura ace FD and Shimano 600 RD, 8 speed basic shimano cassette (I think sora/tiagra).

I know shimano MTB shifters are sometimes made dual compatible, so you ignore the extra click and such when using a smaller cassette. Is it the same case for road shifters, and these particular ones?


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PostPosted: Tue May 29, 2012 6:40 pm 
Old School Grand Master
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Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5966
Location: Lost in Translation
7700 shifters are compatible with an 8-speed cassette if used in conjunction with a 7400-series derailleur.

Shimano used a unique derailleur geometry for their 7400-series Dura Ace derailleurs that required less cable pull per shift than all their other models. When 9-speed cassettes appeared, they harmonized derailleur geometry across their range. But 7700 (9-speed DA) shifters pull the same amount of cable per click as 7402 (8-speed DA).

So, you can use 7700 shifters with your 600 rear derailleur to index a 9-speed cassette, or buy the 7700 shifters and a 7402 rear derailleur to index an 8-speed cassette. Or you can friction shift your current rear mech and cassette with just about any levers.

Here's Sheldon's summary:

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