Originally Posted by ncscott
Its pretty easy realy... An allen key and a chainring nut tool. If you plan on doing it more than once, buy the tool, or just have the shop do it. I've done it without the tool but wont recomend that for disclaimer reasons. You can get away with leaving the crankset on the bike but its much easier to take it off, in which case you need a crankset remover. Of cource if you take the crankset off, you will have to readjust the front derailer. If you can, then its easy... If you can't then pay the shop.
I've wondered for quite a while why people suggest to replace the whole crankset when the rings are repaceable. Any comments on that?
Scott
With a 105 crank, you will probably have to take the crank off to change the inner ring. The BCD on the outer rings is 130 mm while the BCD on the inner ring is 74 mm, too small to work over the arms of the outer rings.