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screw settings when changing to smaller cassette?

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screw settings when changing to smaller cassette?

Old 07-15-05, 10:50 PM
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latompa
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screw settings when changing to smaller cassette?

Current setup shimano 12-25t 9sp.

Thinking about getting new wheels. Would a 12-23t 9sp cassette work?
If so, do I need to adjust the back derailleur?
I've read some posts where people put big rear cogs and need to get new chains or adjust the B screw.
In my case, I should technically have a smaller chain, but since the last cog is the same rating, I thought it would work?

regards,
Tom
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Old 07-15-05, 10:53 PM
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phidauex
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Its only 2 teeth difference, thats only a half link difference in chain length, so don't worry about changing it. You also won't need to change the limit screws on the derailleur, since you are going from 9 speed to 9 speed. You could potentially bring the B tension screw in a tiny bit, but with only 2 teeth difference, it shouldn't matter.

I say just slap the cassette on, and leave the derailleur alone. If it works well now, it should work well with the new configuration.

peace,
sam
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Old 07-16-05, 12:03 AM
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I agree
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Old 07-16-05, 12:24 AM
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Sam,
thnx for the tips! Got the 12-23 cassette and it seems to work nicely.
I did check the play between the top derailleur guide and the big rear cog, and it seemed to be just right.

I did remove the old cassette and while I didn't end up using it, that was a perfect opportunity to clean it, so it's sparkling now too.

Tom
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Old 07-16-05, 05:13 AM
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roadbuzz
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You mentioned new wheels. My experience is that you may have to tweak the rear der cable adjustment when changing wheelsets, even if the cassette is the same.
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Old 07-16-05, 06:21 AM
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Originally Posted by roadbuzz
You mentioned new wheels. My experience is that you may have to tweak the rear der cable adjustment when changing wheelsets, even if the cassette is the same.
Not alwayas, and sometimes never.It depends.
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Old 07-16-05, 08:29 AM
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If your new wheel is one of my respaced frankenstein wheels, you'd probably need to make an adjustment, but most new wheels have the same distance between the dropout and the freehub, with a standard set of spacers. Glad to hear everything came together OK!

peace,
sam
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Old 07-16-05, 03:43 PM
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My previous set up was a Shimano 105 w/ HG-50 Tiagra 9 speed cassette (yes I'm blue collar biker) but I did get a Shimano 6500 Ultegra 9 speed cassette this time.

From reading other posts, it seems these cassettes should work well mixed with other non-Ultegra components (as long as it's the same number of cogs).

In other words, the difference between Tiagra and Ultegra is price and weight, but the sprockets have the same design.

Is that true?

From my test ride, shifting seemed smooth though.

Tom
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