Originally Posted by
Bianchigirll
WHat year is the crankset? that might make a difference but according to my 1999 Campi catalog the Mirage triple takes a 115.5. if you are not using the inner ring position you might beable to use a shorter one but that may require trial and error.
You can only use the middle and outer chain rings on a triple to get any meaningful gear ratio. If you use a triple BB you are not going to be able to get anything close to a useable chainline.