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I wish to put a 13-29 cassette on my bike for some serious hils I currently have a 12-25<br><br>
1) would I need a new rear derailer and chain<br>
2) how (in very simple terms) doees one replace or take of the rear cassette I know you need a tool to unloch the locking nut but what do you do with the chain whip ect<br><br><br><br>
cheers
 

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Best bike resource on the internets:<br><a href="http://www.sheldonbrown.com/" target="_blank">http://www.sheldonbrown.com/</a>
 

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In terms of the rear derailer, it depends, in general the max size of the rear cog for a standard short cage Shimano derailer is 27, so first check your particular model to see if it will handle that size cog.<br><br>
Next, the chain may need to have a couple links added, you will be able to tell when you get it on the bike and look at the extent to which the derailer cage is strtched when the bike is in the 39 x 29 gear, there needs to be a bit of slack in the derailer<br><br>
Finally, the removal is simple. You turn put the lockring tool all the way into the splined lockring and loosen the ring just like you are undoing a nut, i.e. counter clockwise. The chainwhip is wrapped around the cogs in a manner to keep the freehub from twisting, just look at it and it will make sense.
 
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