That depends on your rear derailleur. Most Shimano road rear derailleurs have a maximum cog rating of about 27T but you can often exceed it somewhat. You will probably need a new chain because your current one is probably not long enough. BTW, can you really use a 53x11 high gear or will you effectively have a 7-speed cassette?
Last edited by HillRider; 05-03-13 at 08:15 AM.