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Old 06-17-10, 05:41 PM   #1
KB12
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Trek 510 - derailluer question

Hello, I am replacing my Suntour Cyclone mk II GT derailluer on my Trek 510 and was wondering if a cyclone mk II (not GT) would work. Ive got a 13-24 tooth freewheel on the bike. I found a non GT one on ebay that id like to use. Thanks for your help!
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Old 06-17-10, 06:23 PM   #2
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it'll work fine with a 24t freewheel, but you might need to remove a chain link or two.
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Old 06-19-10, 09:45 AM   #3
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Ok thanks for the help... does the long derailluer have any advantages over the short one, should i try to find a GT? The bolt on my derralluer that holds the cable in is stripped, thats why i am looking for a new one. Does anyone have any tricks to getting it out of there so I dont have to replace it? Also have one more question.... the original front derailluer (also a cyclone mkII) came with a clamp and the one im looking at on ebay has a smaller band but no clamp. Will this work on my bike? Thanks!




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Old 06-19-10, 09:50 AM   #4
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You won't have to shorten your chain. Chain length and cage length are not related.
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Old 06-19-10, 10:43 AM   #5
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GB, not to doubt you, but a longer cage can certainly "wrap" more chain.
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Old 06-19-10, 12:17 PM   #6
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Originally Posted by mudboy View Post
GB, not to doubt you, but a longer cage can certainly "wrap" more chain.
It will need to "wrap" more chain only if the size of the big ring or biggest cog is increased. You are perpetuating a myth.
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Old 06-22-10, 09:31 AM   #7
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Well Ill let you guys know when I get it and install it.
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Old 06-22-10, 02:07 PM   #8
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I never had a bike with a long cage dderailleur, so I might be missing something, but I still don't understand why having a long cage on a derailleur will not require a bit more chain legnth, compared to a short caged derailleur
Looking at the chainline as a triangle with the freewhel cogs, front chainrings and the lowest RD jockey wheel representing the three corners, wouldn't the total legnth of the vectors in that triangle get longer if you pull away one of the corners form the others as you would be doing going from a short cage derailleur to a long cage?
I had a "tight" chainline situation with my Mavic 851 RD when I first installed it on my bike last year. It turned out that the cage was adjusted to be at the bottom of the adjusment slot on the RD. I pulled it up on it's slot and regained chain wrap capacity so my cage wasn't pulled/angled so much forward and assumed a more veritcal position at the middle cogs. Doen't that say that cage legnth does affect chain legnth??

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