Both chainrings are pretty worn and corroded.
Need to replace both.
The small ring is 39 teeth.
The big ring is 53 teeth.
Shimano has an "A" type and a "B" type of chainring.
Mine are the B type.
Ordered a replacement small ring online (found a 7900 series 39 tooth small ring at a good price).
Still looking for a big ring at a reasonable price...
The groupset is Shimano Dura-Ace 7800 series (2004 through about 2008). In 2008, the 7800 series was replaced by the 7900 series.
Although everything was new, The bolt circle (130 mm) and the five bolt pattern was kept the same so a 7900 series chainring will work on a 7800 series groupset.
The 7900 series was replaced with the 9000 series in 2012.
The 9000 series used a four bolt pattern on the crank/chainring so is not backwards compatible to the 7900 series). The 9000 series also became 11 speed.
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