cycles per second
Join Date: Oct 2003
Bikes: Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
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Check your current cranks. They might be drilled for a granny ring. My brother had a Trek from that era with oval rings (SR Ovaltech I think) and the crank was drilled for a granny but run as a double. You might need a longer bottom bracket axle to use as a triple, though. And depending on what you run, you may need a triple specific FD and/or a long cage RD.
Also measure the bolt hole distance. The crank is probably 130mm (~76.5mm between adjacent holes) but may be 110mm (~65mm). If 110mm, just get new rings (and adjust FD height).
Otherwise get the compact crank of your choice and bottom bracket to match, install, adjust FD height, and go.