Don't panic, the crank bolts screw into the bottom bracket axle which then holds the lot together. You should be able to get the ring off without removing the crank. If not, screw the crank bolts back in but loose and go for a quick but careful spin away from traffic. The crank should effectively works it's way loose but it may damage the tapers. Only do this as a last resort...
Don't panic, the crank bolts screw into the bottom bracket axle which then holds the lot together. You should be able to get the ring off without removing the crank. If not, screw the crank bolts back in but loose and go for a quick but careful spin away from traffic. The crank should effectively works it's way loose but it may damage the tapers. Only do this as a last resort...