I currently have an Ultegra RD6500 9 speed rear derailleur. I have a 30/42/52 triple and my cassette is a 12-26. My bike came stock with 106 links in the chain. My rear derailleur is marked with RD6500 with no SS or GS following the number to distinguish between short and long/medium cage. I need a new derailleur and I can only find RD6500 or RD6700 derailleurs listed as short cage. I read that the medium cage is required because I have a triple. But I also read that a short cage can handle a rear cassette up to 27 regardless of the front. The question is --- can I use a RD6500 or RD6700 short cage on my setup? Kindly - Don