Originally Posted by kevntri

I need some help....
I have a Specialized Allez sport triple. I want to switch it over to a double.
Specs say square taper 68mm 118.
It is a 9 speed. I would like a 105 or better. I am thinking about Ebay for cost reasons.
I am totally confused on what to look for????
If I get a crank that is not a square taper and need a bottom bracket, What do I buy size wise.
Is it 118?

I may not be asking the right questions, but the LBS was no help