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Rear derailleur upgrade

Old 05-24-07, 08:24 AM
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Rear derailleur upgrade

I want to upgrade my 9spd Ultegra RD to dura-ace. I know that both 9spd + 10spd derailleurs will be compatible but are there any really benefits with upgrading to the newer 10spd RD?

Thanks.
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Old 05-24-07, 12:09 PM
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No.
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Old 05-24-07, 12:11 PM
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I wouldn't bother unless you just want to have it for the sake of having it.
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Old 05-24-07, 12:29 PM
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You'll shave several grams off your wallet.
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Old 05-24-07, 06:25 PM
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I've got 2500 miles on my Ultegra with deep scratches. I figured if I were to replace it I might as well upgrade.
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Old 05-24-07, 07:00 PM
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Your derailleur will likely go 25k miles. You know if you replace the Ultegra, you'll crash on the first day with your new DA. That's just the way it is.
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Old 05-24-07, 08:45 PM
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The pulleys on 10spd DA are better than the pulleys on Ultegra 10spd. I don't know about 9spd. The 10speed ultegra use plain journal bearings (not ball) on one pulley.
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Old 05-25-07, 05:09 AM
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Originally Posted by bsyptak
Your derailleur will likely go 25k miles. You know if you replace the Ultegra, you'll crash on the first day with your new DA. That's just the way it is.
i'm replacing my 105 FD with a DA FD this weekend. now it is a certain that i will crash. thanks.
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Old 05-25-07, 09:35 AM
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Originally Posted by texascyclist
The pulleys on 10spd DA are better than the pulleys on Ultegra 10spd. I don't know about 9spd. The 10speed ultegra use plain journal bearings (not ball) on one pulley.
Not really relevant. The pulleys are never loaded like the rest of the drive train. Sleeve bearings are fine.
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