Plumbing for some insider knowledge here... I have a mid-80's Specialized Allez road bike with a 68mm bottom bracket. I'm planning on upgrading the cranks and saw jensenusa.com have on offer $100 ultegra 39/53. Of course, the spindle required is octalink, so I'd have to replace my bottom bracket. I see no reason why that'd be a problem, but wanted to confirm that before shelling out around $150...