Can I interrupt this excellent thread to ask a similar question?
I have an 11-23 9 speed cassette with a 39x53 chain ring (Shimano Ultegra). I'm training for a mountain climbing weekend and want to get some nice big cogs at the back - 12-27 I'm thinking. Do any of you experts know whether I'll need more chain or other adjustments to the bike? If so I'll take it into a shop, if not I will buy the cassette on the internet and do it myself.
I have an 11-23 9 speed cassette with a 39x53 chain ring (Shimano Ultegra). I'm training for a mountain climbing weekend and want to get some nice big cogs at the back - 12-27 I'm thinking. Do any of you experts know whether I'll need more chain or other adjustments to the bike? If so I'll take it into a shop, if not I will buy the cassette on the internet and do it myself.