Originally posted by Dirtgrinder
Bottom brackets both tighten by rotating toward the rear of the bicycle.
Dirtgrinder, you assume that both brackets are move-able.
Some bikes have the "sprocket side" cup fixed and it is not meant to be loosened or tightened. it is threaded and look adjustable, but in fact is fixed in place.
I have seen some destroyed by guys who "couldn't get the damned thing to budge!" Then they bring it to me to see if I could replace or fix the cracked cups.