Re: Bottom crank jack shaft.
the SBP freewheel is just like a bmx freewheel but it allows you to change the sprockets and in this case run dual sprockets off the same freewheel
when you pedal and only when you pedal does it become one solid unit otherwise just acts like a regular bearing
Live life as its your last day... it just may be
Learn to do it right or how to fix it later, quicker to do it right the first time.