Hi guy,

I am having a problem with this formula for effective rotor radius

The first says effective rotor radius : rotor dia/2 - caliper piston dia/2

Here is the link below

https://takemebeyondthehorizon.wordp...-5-an-example/

The 2nd says effective rotor radius : D+d

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4

Where D = rotor outside dia

Where d = rotor inside dia

Here is the link as well

http://www.engineeringinspiration.co.uk/brakecalcs.html

Which is correct?. Thanks.