Curious how important the 80mm width is when attaching brake bosses? I assume this is center to center? Curious as to why this is the best placement for them, rather than just take google's word for it.
Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder
The real boss position is dependent on pad extention, rim width, brake arm/straddle cable angles and interference with racks and such. That's why you should mock it up. Any published standard is only the starting point. Andy.
Particularly when working on your first frame it pays to have all the parts together first. Then you can build for the parts. Of course you want to be careful your bike isn't too custom for the real world, but I still like to have all the real stuff to measure up.