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Old 08-20-07, 05:56 PM   #1
glore2002
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7 speed bicycle with an 8 speed cassette.

Hello!
I have a 7 speed bicycle (7 speed shimano shifter). I changed my hubs to Alivio FC-M495. Rear derailleur is an Acera RD-M340 and the Crankset is a FC-TX71.

In order to make this combination work, the mechanic that installed the hub put a 7 speed cassette (cs-hg30-7i) with an additional -supplementary- ring (replacing the 8th sprocket).

Since I am experiencing some problems when the chain is on the 3rd sprocket (it makes a bad noise as if the chain were not fitting on the sprocket correctly), I am planning to change the cassette to an 8 speed one so I wont need to use the additional ring.

What would happen if I use an eight speed cassette such as Alivio CS-HG50? I guess the only problem would be I wont be able to reach the biggest sprocket. Is that ok? Is the space among sprockets the same for a 7 and an eight speed cassette?

I hope I was clear enough :-)
Thanks in advance,
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Old 08-20-07, 07:21 PM   #2
Retro Grouch 
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The space between cogs is very close, but not exactly the same for 7-speed and 8-speed cassettes. Many mechanics report they mix and match shifters with 7 or 8-speed cassettes with good results. However I've personally never been able to make such mixed combinations work to my satisfaction.
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Old 08-20-07, 08:21 PM   #3
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I had a set up like that once and it did not work very well. It was ok, but not great.
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Old 08-21-07, 04:46 AM   #4
glore2002
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So, your recommendation is...

Thanks for the help. I didn't know the space was not the same. So, is it better to use a 7 speed cog with the additional ring?

Thanks again,
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