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shimano 8 spd(5 posts)

shimano 8 spdmerepoint
May 29, 2001 9:05 AM
I am planning on changing out my Ultegra 600 8 speed cassette (11-21)(and chain) with a new one (12-25). the middle cogs are worn and the chain is stretched. I have never done this before. I've got the chain whip and the lock ring tool. anything tricky about this I should be aware of? Will the new HG chain need to be adjusted in length due to the new expanded gear ratios? Should the Shim. 600 shifters work OK?
thanks.
Piece of cake!Spoke Wrench
May 29, 2001 9:19 AM
There is nothing exotic about changing your cassette. If you have ever changed an old, spin on freewheel, you are going to be surprised at how easy a cassette is to change.

Definitely resize your new chain length to match your new cassette. Just test fit the chain around the big/big combination while bypassing the derailleur and add 1 inch to the chain.
re: shimano 8 spdLarry Meade
May 29, 2001 9:26 AM
There is nothing really tricky about making this change. It is entirely possible that you may need to lengthen the chain. It is impossible to say for sure since there are so many ways to determine chain length. My personal method differs from some but has never failed me yet. I will run the chain through the derailleurs and then put it on the small chainring and smallest cog. I then pull the chain tight until the chain no longer scrapes on the chain keeper on the rear derailleur cage. This is the little aluminum tab that keeps the chain from jumping off of the guide pulley. To me, this is the longest that I can run a chain with that particular gearing. Even though you should never be in that gear, it sometimes happens in the heat of battle. I want to make sure that I don't destroy something if I inadvertantly go there.
re: Chain lengthRusty Coggs
May 29, 2001 6:37 PM
Isn't one more likely to destroy something if the chain isn't sized correctly for the big/big combination? Even thouth one isn't supposed to go there either it sometimes happens. I have experienced a too slack chain due to insufficient wrap capacity and nothing happened other than some noise of the chain rubbing the derailer to wake me up.Could not a too short chain on the big/big rip the derailer out of the hanger? Not something I want to try.......
re: shimano 8 spdschneiderrd
May 29, 2001 11:11 PM
Check out the following URL: http://www.bsn.com/cycling/gears8.html