Joined: Jul 2007
Posts: 1,506
Likes: 1
From: Santa Barbara
Bikes: SE Quadrangle, '82 Venus NJS, '03 Bianchi Pista, '86 P'sonic Mt Cat, Fat City Yo Eddy '91 + '93, B'cuda A2E, '86 Trek Elance 400, '88 Centurion D.Scott Expert, '88 Fisher Mt Tam (and no longer with me: SE OM Flyer, Umezawa/B-stone/Samson NJS)
I think your LBS guys might be mixing up a few different stories. I have never never ever heard of the bolt-on keirin front brake sets causing fork failure, but do share stories if any one has them! The famous fork failure was Vivalo--maybe they are confused? Those keirin front brake sets have been around for quite a while too (at least several decades in Japan).
Mugatu--- the ones mounted on the rear are easier to put on and cheaper. I think that's the main incentive to using those instead of the front.