Originally Posted by HillRider

Correct and the other point for the OP is the Suguino crank has it's chainrings spaced for 7-speed chains. A 9-speed chain is significantly narrower and may want to fall between the chainrings and "skate" on the inner ring instead of shifting cleanly.

A 9-speed chain can be used on an older crank but you will have to pay attention to your front shifting and avoid shifting under load. Also, the old Suguino chainrings lack the ramps, pins, etc. enhansements that make new cranks shift so well. Using the Ultegra crank can pay more dividends than you may think.