bres dad

This is a time critical question (supposed to meet the guy today) but wondering what potential issues I might be getting into by buying a used FSA SL-K carbon crankset (standard gear set, 175mm). Not sure what the interface is but BB is included and looks like it will work on my bike (standard English threaded) but I will have the bike with me so we can actually check it. It would be replacing an Ultegra 6600 crankset for now (I may end up using it on another build later).

Drew Eckhardt 

The NDS self-extracting cap has a standard right hand thread so it tends to come loose when you remove the crank arm. Make sure it's tight using a pin spanner so it doesn't vibrate out and get lost.

FSA rings don't shift up instantly as often as Shimano and Campagnolo.

The FSA SL-K has solid carbon fiber crank-arms which give up about 100 g rams to the SL-K Light crank.

The SL-K and SL-K Light Mega Exo cranks take different bottom brackets, with the hollow crank arms requiring a thinner NDS bearing. Make sure you get the right one.

There's also the BB386EVO SLK Light with a 30mm aluminum spindle which weighs less and takes a different bottom bracket.

bres dad

I don't believe this is the SL-K light. Only SL-K is specified in the ad and the photo doesn't appear to say 'Light' anywhere, if it even would. Assuming its not the Light, how much of a risk would the arms cracking be? Where I mostly ride tends to be fairly flat. I'm also not one to mash the pedals with the force of a hydraulic press.

CliffordK

I think some of the FSA cranks suffered a problem with the NDS arm becoming loose. So, once the holding bolt is tightened down, if it is still loose, then just walk away from the crankset.

bres dad

So I met up with the guy and looked at the crankset. There's more wear on it than I expected (a little gouging but not deep) and it needs cleaned up but itthe NDS is nice and tight. Also fit perfectly into the existing bottom bracket. We're good to go...