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Old 02-25-06, 09:57 AM   #1
BubbaDog
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9 Speed vs. 10 Speed RD?

Can a Shimano 105 9 speed RD be used with a 10 speed cassette? Will the limit screws allow the additional travel? And will the indexing work properly with the 10 speed brifters? TIA for the help....

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Old 02-25-06, 10:00 AM   #2
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Yes, on all counts.
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Old 02-25-06, 10:01 AM   #3
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There is no such thing as a rear mech with 'speeds'. The short answer is yes, a 105 mech 5500 can be used with a 5600 cassette, but I would encourage you to read Sheldon's article on mechs to appreciate how they work. They are very simple and rely only on a spring and a cable pull coupled to a parallellogram mechanism. The SHIFTER is what dictates how many speeds you have.
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Old 02-25-06, 10:34 AM   #4
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Guys,

Thanks for the quick responses. I do understand the workings of a RD, but being an old friction shifter guy wasn't sure if these new-fangled thingmajigs worked differently. Thanks again....

B'Dog
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Old 02-25-06, 12:23 PM   #5
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Minor point but 10-speed cassettes aren't any wider than 9 or 8-speed cassettes, its just the spacers and cogs are thinner. They all fit on the same width freehub body so derailleur travel that's enough for one is enough for any.
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Old 02-25-06, 12:35 PM   #6
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Quote:
Originally Posted by HillRider
Minor point but 10-speed cassettes aren't any wider than 9 or 8-speed cassettes, its just the spacers and cogs are thinner. They all fit on the same width freehub body so derailleur travel that's enough for one is enough for any.
Shimano's 10-speed cassettes are a little wider than 9-speed cassettes (there's a little recess on the back of the spider for the largest cogs allowing them to extend past the inside of the cassette body) but the range of travel on standard derailleurs is plenty large enough to compensate.
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Old 02-25-06, 01:05 PM   #7
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Quote:
Originally Posted by juicemouse
Shimano's 10-speed cassettes are a little wider than 9-speed cassettes (there's a little recess on the back of the spider for the largest cogs allowing them to extend past the inside of the cassette body) but the range of travel on standard derailleurs is plenty large enough to compensate.
Good point that I missed since the freehub bodies are all the same width.

The only "negative" effect of the recessed spider on the 10-speed cassettes is that it prevents the old tourists customizing trick of removing an intemediate cog and adding a larger cog behind the cluster to get a lower gear.
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