brake drums

Almost all of the 10" flared drums I've seen had a 10.090 max spec stamped on them. The earlier non-flared ones from the factory were almost always 10.060 drums, and were not stamped with a max spec. Replacement drums I've seen were all stamped, and were mostly 10.090's but not all were. It depended on the supplier and those came and went over the years.