That bottom bracket will not fit a Viscount frame it is to big in diameter without cutting away the frame tubes that go into the BB. You would not want to do that as there is then a much greater chance of breaking the frame. The only thing that fits Viscounts is the original BBs and bearings. Those are easy to buy new bearings for and reuse the spindle. Unless you are Lance the chances of you braking the spindle are very small. The spindles are hardened after the clip grooves are machined into them. If you are worried about the bearings just take two more with you when you tour. Roger