I currently have Sugino crank arms and Sugino triple crankset with a 110mm bolt circle. She's a 7-spd and I want to upgrade to Shimano's newer offering FC-R601 and FC-R603 so I can get 10-spd capability. My Burley has the eccentric bottom bracket and is the square-taper type. What bottom bracket do I get for the Shimano package? Everytime I look at the bottom bracket in pics it never shows or mentions if it is eccentric. Maybe I can't upgrade and if thats the case I sure would like to know so I can do with a square taper Davinci or T/A.