On another forum I frequent, someone on there has used old centre pull brakes on their road to CX conversion. Some can mount to regular brake holes, but provide more clearance that regular calipers. Could be an option on something like a Steamroller or old road frame built for 27" wheels that you don't want to braze canti posts on.
Going back to calipers vs. canti's on CX bikes...
On another forum I frequent, someone on there has used old centre pull brakes on their road to CX conversion. Some can mount to regular brake holes, but provide more clearance that regular calipers. Could be an option on something like a Steamroller or old road frame built for 27" wheels that you don't want to braze canti posts on.
https://sslcache.se/07e0d7b22e303367ac9f688e1381aaaaefb6c7a4/687474703a2f2f696d672e626c6f67626c6f672e636972636c65732d6a702e636f6d2f32303130313230375f3538363632322e6a7067
https://sslcache.se/76bc2ca9b4637f569d0cca88e1a096a07b55b116/687474703a2f2f322e62702e626c6f6773706f742e636f6d2f2d41726d316e326a487161632f54676e363059444b5155492f41414141414141414575412f523045466a2d6a35324d492f733430302f7368696d616e6f2d647572612d6163652d63656e74657270756c6c2d63656e7465722d70756c6c2d706169722d6272616b65732d7365745f3137303631393636303532332e6a7067
http://farm6.staticflickr.com/5466/6952446114_c09ab8a37b_z.jpg