bulgie 

A bit off on a tangent... for about 40 years now I've been thinking of trying Mafac Tiger centerpulls with a wider tire, looks like they can handle 50 mm or more, but only on brazed pivots.

This is "off-label" usage, Mafac never intended them to be used that way, that I can determine. They were marketed as racing-bike brakes for skinny tubulars. Then why so wide? (Even wider than a Raid.) Dunno, maybe to look powerful. But the etrier, aka the yoke that holds the two pivot posts when mounted to the crown and bridge, severely cuts into the clearance under the brake, so this only works for fat tires/fenders if you delete the etrier. And this is not a great candidate for brazed pivots, because the pad height isn't adjustable at all — other than by angling the pads, which results in pads hitting the rim at an awkward angle. So it might be do-able, but the posts will have to be brazed on at exactly the right height to hit the rim correctly. And not just when the pads are new, but throughout the useful life of the pads. Different rim widths might be hard to accommodate too.

They were not popular, and only lasted on the market a few years, early '60s. The rarity makes them expensive when you can find them, but I do have a few sets I picked up over the years. I think, though a bit impractical, they could allow centerpulls to be used on tires that are too wide for a Raid. And look [rhymes with witchin'] doing it, which as we all know is super important.

Mark B