This is another integrated spindle external bearing crank. This one you do want to tighten on very tightly like old styled crank arms were done. It has a self extracting bolt. This bolt has a shoulder on it that sticks out, and this ring, when you loosen the bolt, it just pulls the crank right off.
Unfortunately, the self extracting nut is coming off as well as the crank, and this bolt should be held in by this ring. This part you actually want to have stay on the crank, so I am going to put some lock tight on here. It takes a pretty big hex key to tighten that in there. So now I can just pull the crank out, just like any other integrated spindle crank.
This is the part that is different and unique about a Truvativ; the left crank instead of just being able to slide anywhere onto here the way the Shimano system works and some of the other systems work, this actually has a shoulder, so you tighten this crank fully against that shoulder and it pinches the bearing on the non-drive side and holds it in place.
You can see the bearing here. You can replace the bearing, if that's what it takes to fix your bottom bracket, but the Truvativ is different from Shimano in that you put no spacers in it. It does not have any allowance for a Shimano E-type Front Derailleur. So I am just going to put a little bit of grease on the two places where the bearings sit. This part here forms the lip seal for that bearing, so that just goes flat up against the bearing and you push that crank in.
This could actually be -- I think you can install this any way you want, and obviously you put at it 180 degrees to the other crank.
The fact that I don't have a 16 mm hex key to tighten in this self extracting ring doesn't actually matter for this procedure. Truvativ torque specifications say that this bolt is supposed to be tightened on 41-46 newton meters. Crank is tight; it is installing and just assembling a Truvativ Giga X Pipe Crankset.
Transcription by:
Scribe4you Transcription Services