Originally Posted by
fuzz2050
It might not be so easy, some of the modern triples, especially those for ten speeds don't use the 74 bcd granny, instead they use a 92 bcd, which doesn't allow for the tiny granny gears of a 74. The smallest commonly available chainring for 92 bcd is a 30.
I'm not saying yours is one of these, but you have to check.
AFAIK, Dura Ace was the only one that did this and only for the 7800 series. The new 7900 series doesn't list a triple at all. Ultegra and 105 triples were and are 130/74.