Great to hear the news about the new Rivendell dual pivot calipers, Bikingshearer! ~~ I'm both poor and cheap, so I resist spending a lot on "modern" components, BUT, Rivendell is a very small operation without the power of massive purchasing to keep their prices lower. So, I never really mind supporting their enterprises, and even paying a bit more than I might find discounted at Nashbar, etc. -- Who else would bother to fight for the wonderful yet un-trendy fabrications we all love to have available for our projects. And, Tektro makes some truly beautifully finished products.

I have an old 1981 Weinmann catalog which shows some of their now long gone sidepulls, some of which had an insanely long reach but were all quite basic single pivot variations on the same design as the 500, and lacked even a quick release feature.

[ FYI: Weinmann Model #810 = 61-79 mm • #890 = 69-87 mm • #1020 = 74.5-92.5 mm • #1080 = 84.5-108 mm (Wow! that's over 4 inches!) ]

Ditto on the Paramount P-15 caliper reach issue. I have a 1971, and even with a drop-bolt and 27" rims, I had to use Weinmann 750 centerpulls (same as Dia-Compe) rather than early Campy brakes. Weinmanns were the original factory spec. brakes for the model, anyway. Mathauser pads do make a great difference, but don't expect the same "Power Brakes" feel as modern dual pivot calipers (even though center-pulls were in fact the original concept behind dual-pivot braking power).

I hope the new Rivendell brakes will be olde-style bolt-ons - I do hate having to drill out fine old framesets just to accomodate recessed mounting bolts.