The advertising brochure for my 1989 bridgestone Comp MB2 says it has a 'grease injectable bottom bracket'. I bought the bike new and am overhauling it after not riding for a long time. I can assure you there is no grease fitting or other provision for injecting grease into the BB. I have replaced the original 3SB spindle and cups and there was nothing different about them. The crank arm bolts are normal - no secret passages. Even if you could shoot grease in via the seat tube, the BB came with a plastic protector, so it couldn't get to the bearings. I'm completely stumped and can only surmise that perhaps it was a feature on the MB1 that got into the brochure by mistake, but I thought I'd ask if any bike has a 'grease injectable' BB, and how does it work??