>sch: I really don't know the composition of the older Craftsman taps I recommended, but I've used them for 20+ years for auto related fabrication work, (cutting new threads), and I've never broken one. Whatever metallurgy they used, they are very durable. New Craftsman stuff is different; and MUCH lower quality. Other than these, I use Snap-on taps, and I've broken plenty of those.

They are NOT bike specific at all though.