[CR] Re; Centerpull pivot spacing on Herses

Adam, The spacing for Weinmann centerpulls is wider @67,, than Mafacs @62, of course raids are widest @76mm. Herse may have preferred the weinmann's just for that reason, they allow more fender clearance and easier installation because they land on the rear stays better.

Regardless of the brake you're going to use, use the factory bolt-on mounting plate as a starting point for your spacing. You can go a little wider but you may have to custom file a few spots on the arms that will rub against each other as the straddle pulls the arms up.

As the rear spacing grows wider and the frame size grows taller the mounting becomes more difficult. No expert here but most Herse-Singer"s of the period were probably 120mm spaced... 130 is now more common and that little extra spread at the dropouts does affect the distance up the stays.

My picture here, http://www.flickr.com/photos/49353569@N00/2514596698/in/photostream/ shows a curved bridge, but if you look closely you'll notice the bridge continues down the inside of the stays, and that allows you to "land" the cp-boss partly on the stay, and partly on the bridge extention... This picture shows the boss resting on both stay and bridge. http://www.flickr.com/photos/49353569@N00/2514596700/in/photostream/ I started doing this out of frustration, the bridge just started to grow, and become a structural element in the design, not just a pretty place to hang a fender. Hope this helps.

peter weigle
lyme,
ct.