The OP was assuming 20% loss to the wheels. If you are looking at WHP, and want to reverse the 20% loss, you multiply by 1.25.
(if you take away 1/5 of any number, then you add back 1/4 to the new number, to get back to the original number.)
From other postings here I was thinking the loss is about 15%. But who knows. How can you actually tell?
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