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9 spd STI lever compatibility with 8 spd drivetrain(6 posts)

9 spd STI lever compatibility with 8 spd drivetrainroybite
Jun 8, 2001 3:57 AM
Will 9 spd STI lever and 8 spd drivetrain combo work reasonably? By adjusting cable tension I assume you can adjust for the different cog spacing and leave the extra click at the smallest cog. Thanks in advance for any input.
My Dura Ace 9STI works with 8 spd(nm)Dave Hickey
Jun 8, 2001 4:51 AM
nm
re: 9 spd STI lever compatibility with 8 spd drivetrainRusty Coggs
Jun 8, 2001 7:06 AM
Any Shimano 9 speed shifter will work perfectly with an 8 speed DURA ACE rear derailer to shift an 8 speed shimano cogset.Cable tension won't compensate for differences in cog spacing.The extra click works best if in the low cog position .Lock out the shift with the low limit screw.
Nope, won't work.Spoke Wrench
Jun 8, 2001 10:14 AM
If you think about it, a 9-speed cassette has 9 cogs in the same amount of space as 8 8-speed cogs. So by the time you shift from one end of the cassette to the other, you are going to be a whole cog off and most of the in-between gears are going to be noisy.

As other posters have mentioned, Dura Ace 8-speed derailleurs are an exception.
re: 9 spd STI lever compatibility with 8 spd drivetrainDuane
Jun 9, 2001 5:31 PM
The 9 and 8 speed shifters have the same cable movement. Hence, if you use a 8 speed derailleur it works fine. I have done it and the Shimano documentation also supports this. If you use a 9-speed rear der. there are 2 different ways to mount the cable. One for 9-speed and another for 8-speed. Of course, you need to set your stops so that you do not use the extra click.
re: 9 spd STI lever compatibility with 8 spd drivetrainLC
Jun 10, 2001 11:56 AM
The amount of cable pull is less for each click on the 9 speed then the 8 speed, so your shifts will be off. The only exception is Dura-Ace 8 speed and any 9 speed can be made to work together. The front/left shifter will work fine though.