Sherman: 33-ton tank, Tiger: 60-ton tank; Sherman: mainstay of US armor, Tiger: heavy tank. You're comparing apples and oranges.

The Sherman's counterpart was the Panzer - which the Germans still only built roughly 15k of - but then again, the Germans also made heavy use of tank destroyers and assault guns - the Stug III by themselves were another 10k worth of hulls.

But, again, just because someone has more capacity than you doesn't mean you're not building at scale.