Hardware stores have Metric allen wrenches I have an 8mm allen as my crank arm fixing bolt,
but I cannot see yours.
The Octalink is a bigger tube than the square taper , you need a new crank arm extractor tool.
IF there are 2 little pin spanner holes in a ring around the bolt head
you may have a self extracting bolt . the ring screws into the place where the extractor may
be threaded into , It should come out with out another tool..
[carefull I've had a self extractor strip the crankarm and not budge ]
If there is a black plastic ring around the bolt Its not self extracting..
You should not have to remove the FD.
if you are not changing the big ring..
you will need a 5mm allen to take off the third ring mounting bolts.
Last edited by fietsbob; 09-28-10 at 12:28 PM.