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Old 09-28-10, 09:45 AM   #1
cyclist2000
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Mods to Jamis Aurora Elite Drive Train

I have a 2009 Aurora Elite, it has 105 STI 10 speed shifters, Ultegra RD and a 12-27 rear cog. I was thinking to put a 9 speed 11-34 cassette. If I made this change I am assuming that the RD would need to be replaced with a mountain bike RD. This would change my low end gear inches from 30 to 23.

Would the shifter work without any problems? I don't know if the cable pull is the same or would I need to get a JTek shiftmate to cleanup any shifting problems?

And if you have a better idea, throw it out here.
I had thought of using the new 10 speed cogs and RD but this seems to be a cheaper way to go.
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Old 09-28-10, 09:51 AM   #2
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With very few exceptions, Shiman (rear) shifters all pull the same cable, so you should be OK with that.
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Old 09-28-10, 12:19 PM   #3
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To make the 10 sp shifter work with 9 cogs, you may need to look at getting a shiftmate since the cassette spacing is different - OR - look at pairing SRAM Apex cassette with 9 sp Shimano MTB derailleur.

See shiftmate details here: http://www.sheldonbrown.com/harris/shiftmate.html
and
Cassette Spacing here: http://www.sheldonbrown.com/k7.html#spacing

According to sheldon, 9sp is 4.34 mm, whereas 10sp is 3.95 mm
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Old 09-28-10, 01:35 PM   #4
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Originally Posted by novacoke View Post
To make the 10 sp shifter work with 9 cogs,
Dang, I missed that he was planning to change speeds as well as range. That's not a happy combo.
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Old 09-28-10, 03:19 PM   #5
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How about trying a 10spd SRAM cassette and Deore XT RD? The RD should work fine, but not sure about the cogs.
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Old 09-28-10, 11:25 PM   #6
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How about trying a 10spd SRAM cassette and Deore XT RD? The RD should work fine, but not sure about the cogs.
I was thinking about the 9-speed setup to save money on the components. I had thought about a 10 speed setup but the derailleur and cog are more expensive than the 9-speed.

The cost savings won't be so good if I need the shiftmate.
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Old 09-29-10, 07:39 AM   #7
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Here's what I did to my '09 Aurora Elite (GREAT bike, btw): install a 26t small chainring up front to replace the stock 30t small ring. Front shifting is still very good. I'm still using a 12 x 27 10 speed cassette.

If I wanted lower gears than that, here's what I would do: install one of the new 10 speed cassettes by Shimano or SRAM in something like 11 x 32 or 11 x 34 and install a Shimano mountain bike rear derailleur, realizing that the new Shimano Dyna-Sys "10 speed" mountain bike derailleurs have a different cable pull ratio than other current Shimano rear derailleurs, so I would need to stay away from them because they won't be compatible with my 10 speed road shifters. Oh, and I'd also need a longer chain if I installed one of those cassettes.
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