Originally Posted by
rccardr
The subject RD is a hybrid/mongrel made with 7400 body and 6207 long cage. HWSNBN acquired it from someone and passed it along to Pat. Note that the body is the same as a standard 7400 so it won't take a larger gear, but the long cage means Pat can use his beloved triple with up to a 28/30 cog. For larger gears with a DA RD, best to locate a 7703 or 7803 which is a true long cage DA unit that willk work with a 30/32 combination.
BTW, unless your RD hanger is super short (e.g. Cannondale) 7410/740X/7700 will easily shift up to a 28 or 30 in both large and inner chainrings. That setup is on several of my own bikes.
You'll probably have to adjust the dropout screws to pull it back farther in the dropouts and tighten the B screw, but it works
rccardr gives some good advice, as always. If a person is going to index with more range, best to use another RD. In this case, the DA GS/ triple will be for climbing rides in friction mode with 7/8 speed clusters.