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Old 11-12-10, 09:04 PM   #1
Gearhead65
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9 speed to 10 speed conversion

I am helping a friend do some upgrades on a Trek 2004 5200 outfitted with 9 speed Ultegra.
Would like to possibly upgrade to a Ultegra 6700 5 pc group (use existing crank)

1) Are there any issues with using the newer 10 speed chain with the old 9 speed crank (ie - tooth width, etc)
2) What is the difference between a 6700 and a 6703 lever?
3) Any other 'gotchas' to be aware of?

Thanks!
Tom
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Old 11-12-10, 09:08 PM   #2
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1. No problems what so ever. I'm currently running a 10-speed Shimano cassette and 10-speed Wippermann chain on a 9-speed Ultegra 6500 crank with no problems at all. It shifts great.

2. The 6700 is for a double and the 6703 is for a triple crank.

3. None I can think of except cost.
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Old 11-12-10, 11:22 PM   #3
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As HillRider says, cost is the obvious drawback. I had switched from 9spd to 10spd and found I could not get the low gears I wanted (at that time). I switched back to use MTB cassette for the low gears. I have 24/34/52 with 11-32 9spd, and it works great for what I need.
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Old 11-13-10, 05:23 AM   #4
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If your friend rides competitively or just wants "gee-whiz" kicks it might make sense to go 9>10. Otherwise it's pretty pointless, since the range doesn't really change necessarily.
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Old 11-13-10, 06:07 AM   #5
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Tom, Insure the chainrings aren't too worn, as in any chain replacement.

Brad
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Old 11-13-10, 07:13 AM   #6
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Quote:
Originally Posted by Gearhead65 View Post
I am helping a friend do some upgrades on a Trek 2004 5200 outfitted with 9 speed Ultegra.
Would like to possibly upgrade to a Ultegra 6700 5 pc group (use existing crank)
I can only think of 3 pieces that need to be changed; the brifters and cassette (plus chain: a supply item). Unless something like a brifter is broken, it seems like a big waste of money to get one extra cog in the middle of a cassette.
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