Originally Posted by
puckdaddy
That makes sense, thanks. One more thing, what does it mean when it says a-type in regards to the chainring?
In short it refers to the two large ring's size. A rings, IIRC is a (53)52-42 pairing and B type is for a 53-39 pairing on a double. A rings should be used with other A rings and B rings with other B rings for the best possible shifting. They can and have been mixed by others and will work, but less smoothly than with a proper pairing.
I have one STI shifted bike without ramps and/or pins on the chain rings and it shifts just fine...YMMV. You may also try looking for a 5500 42T chain ring.
Brad