Originally Posted by
joejack951
That's an odd statement. Perhaps you meant "old tech". Much like 8 speed STI (which contrary to popular belief, is not obsolete either).
Unless you meant something other than this definition of obsolete: no longer produced or used.
I'm with cyccomute on this one. Cottered cranks are still functional if you have the knowledge to work on them and the nostalgia to want to. They are now the province of the C&V types.
Otherwise they are many generations out of date and there are several lighter, easier to work on and easier to find parts for designs now available. Square taper cranks and bottom brackets are far more available and certainly lighter than any cottered crank and even newer designs like Octalink/ISIS (already out of date) and external bearing cranks have overcome the minor disadvantages of square taper.