@Kimmo, I added a picture and a bit of text to hopefully explain things better.
Originally Posted by
TallRider
In both the Brooks and the RBR saddles, the rear of the bolt goes through the metal loop attached to the saddle rails, and the front of the bolt goes to/through the forwardmost part of the steel plate that is riveted to the leather in the nose of the saddle.
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"c" is not a unit that measures tire width