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Shimano Derailleur question
I have seven cogs. Do I have to get a Shimano derailleur that is
specifically for 7? I see Shimano Sora for 8... Have Sora shifters, BTW. -Bob |
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Shimano Derailleur question
On Aug 5, 10:31 am, Hell and High Water
wrote: I have seven cogs. Do I have to get a Shimano derailleur that is specifically for 7? I see Shimano Sora for 8... Have Sora shifters, BTW. -Bob Hi there. Nope. 7 and 8 spacings are the same center to center. That is why you can use 7 of 8 cogs from an 8 speed cassette on a 7 speed body. Cheers from Peter |
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Shimano Derailleur question
On Aug 5, 10:31 am, Hell and High Water
wrote: I have seven cogs. Do I have to get a Shimano derailleur that is specifically for 7? I see Shimano Sora for 8... Have Sora shifters, BTW. -Bob Hi there. 7 and 8 speed cassettes have the same center to center distances between cogs. That is why you can use 7 of the 8 cogs from an 8 speed cassette on a 7 speed freehub. Cheers from Peter |
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Shimano Derailleur question
On Aug 5, 8:07 pm, Sir Ridesalot wrote:
7 and 8 spacings are the same center to center. True for Campy, not true for Shimano. 7 speed spacing for everyone was 5mm. Campy8 was also 5mm but Shimano8 was 4.8mm. Every iteration since has followed, Campy spacing is 0.2mm wider than Shimano. For practical purposes, yes, you can use S8 shifters on 7-speed setups, but they're not spaced the same. The be-all, end-all article on the subject can be found he http://www.ctc.org.uk/DesktopDefault.aspx?TabID=3946 And to answer the OP's question, any Shimano index-compatible derailleur will work with any shifter/cogset combo, except for 6/7/8- speed Dura-Ace, with 74xx model numbers. |
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Shimano Derailleur question
On Aug 6, 1:43 pm, Hell and High Water
wrote: In article .com, says... On Aug 5, 8:07 pm, Sir Ridesalot wrote: 7 and 8 spacings are the same center to center. True for Campy, not true for Shimano. 7 speed spacing for everyone was 5mm. Campy8 was also 5mm but Shimano8 was 4.8mm. Every iteration since has followed, Campy spacing is 0.2mm wider than Shimano. For practical purposes, yes, you can use S8 shifters on 7-speed setups, but they're not spaced the same. The be-all, end-all article on the subject can be found he http://www.ctc.org.uk/DesktopDefault.aspx?TabID=3946 And to answer the OP's question, any Shimano index-compatible derailleur will work with any shifter/cogset combo, except for 6/7/8- speed Dura-Ace, with 74xx model numbers. I believe my shifters are 3300 series. My rear derailleur is not even Shimano.... LBS suggested I switch to a Shimano rear to smooth things out. They ordered one ($30) but if it says 8-speed, I wanted to know if I should be concerned. I believe the derailleur they ordered is Shimano Sora, but I'm not clear on 7 vs. 8. Thanks! -Bob PS: What about the freewheel? I believe my derailleurs/chain/freewheel are suntour.- Hide quoted text - - Show quoted text - OK, yeah, Suntour used different spacing from cog-to-cog, not even 5mm per, so get a new one (and a chain, since they wear together) when you replace the RD. The Sora should work fine, 6, 7, 8, 9 or 10 speed. I'd be concerned about your front shifting, too, but if your current setup shifts OK in the front, leave it alone. |
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