Originally Posted by
LordBass
I have an 83 Super Mirage, which is nearly identical - just one notch up the ladder. Your crank is probably a three-piece, so just take it apart & use smaller single-stack bolts for the inner 42t crank.
The inner "crank" aka "chainring" is attached to the outer chainring, which is permanently affixed to the crank arm. These cranks don't have a spider like most cranks:
The outer chainring acts as the spider, and the inner chainring attaches to it.
Three piece means that the crank has two separate crank arms and a bottom bracket:
