Rear Derailleur Choice for Large Cassette
07-05-13, 01:16 AM
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Rear Derailleur Choice for Large Cassette
HI All,
I was wondering of someone can help me. I live in a hilly area and have just fitted a 28t cassette (was 23t) to my vintage 9 speed Olmo to try and prevent me from having a heart attack whilst tackling some of our local climbs.
Since doing this, my old 105 rear derailleur is not too happy and the jockey wheels are making rather a lot of noise
I fitted a new chain to the correct length along with my new larger cassette, I have adjusted the 'b-tension' screw as far as it will go on the mech but still no luck.
So, I am going to change the derailleur to a 9 speed campagnolo chorus to match the other chorus bits on the bike (the 105 mech was fitted by the last owner for some reason and is a total miss match with the rest of the components)
However, as I want to make sure I don't have the same issue with the jockey wheels I was wondering if anyone had any thoughts with selection of the new one? Existing 105 mech has a medium cage length, would there be any benefit to switching to a long cage? I'd rather stick with medium if I can?
Overall set up is 39/52t at the front and 13/28t at the back
Any thoughts / advice on derailleur selection? Anybody know if a 9 speed chorus mech from maybe the early 2000's will run ok on this setup?
Thanks for your help
Andrew
I was wondering of someone can help me. I live in a hilly area and have just fitted a 28t cassette (was 23t) to my vintage 9 speed Olmo to try and prevent me from having a heart attack whilst tackling some of our local climbs.
Since doing this, my old 105 rear derailleur is not too happy and the jockey wheels are making rather a lot of noise
I fitted a new chain to the correct length along with my new larger cassette, I have adjusted the 'b-tension' screw as far as it will go on the mech but still no luck.
So, I am going to change the derailleur to a 9 speed campagnolo chorus to match the other chorus bits on the bike (the 105 mech was fitted by the last owner for some reason and is a total miss match with the rest of the components)
However, as I want to make sure I don't have the same issue with the jockey wheels I was wondering if anyone had any thoughts with selection of the new one? Existing 105 mech has a medium cage length, would there be any benefit to switching to a long cage? I'd rather stick with medium if I can?
Overall set up is 39/52t at the front and 13/28t at the back
Any thoughts / advice on derailleur selection? Anybody know if a 9 speed chorus mech from maybe the early 2000's will run ok on this setup?
Thanks for your help
Andrew
07-05-13, 01:52 AM
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I'd flip the b-tension screw and screw it in from the other side, so the head hits the hanger tab. This will push the upper pulley a little further away.
Cage length does not affect largest cog capacity.
Cage length does not affect largest cog capacity.
07-05-13, 01:55 AM
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Hmm, ingenious. thanks for the advice, will give that a try!
07-05-13, 02:24 AM
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Hang on, are you using a Shimano derailleur with Campagnolo shifters?
07-05-13, 02:38 AM
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Yep....sigh...... shifters are non-indexed down tube jobbies though so they work reasonably ok with the shimano mech. Project is to switch everything to campag over time. Just wish the last owner had done that....
07-05-13, 05:57 AM
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Ah, then it's not going to be some subtle indexing issue arising from Campy and Shimano spacing being ever so slightly different.
07-05-13, 10:07 AM
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Hmm, what generation of 105 is this? My 8-speed one has no trouble with a 28-tooth cog. In fact, I was able to remove the B-tension screw entirely.
P.S. Another option, if you have horizontal dropouts, is to scootch the wheel forward a little if you have room. That has a similar effect to tightening the B-tension screw.
P.S. Another option, if you have horizontal dropouts, is to scootch the wheel forward a little if you have room. That has a similar effect to tightening the B-tension screw.
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07-05-13, 11:13 AM
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