I went to look at a bike over the weekend, turned it over and found these screwed in cable guides on the bottom bracket shell. The bike has Campy Athena on it and rides very well. It is supposedly a mid 90's bike (I know that's not exactly classic and vintage). What's up with these cable guides? Is there an plausible explanation and what does it indicate about the bike, if anything? Should I be concerned? This kinda threw me for a loop. The bike rides very well! Thanks for any info!

I don't understand your concern...

There are literally millions of bikes with cable guides under the bottom bracket like that.

It might mean that it isn't a boutique frame, but definitely nothing to be concerned about.

Its the done thing, don't sweat it.

They serve a purpose - keeping the cables secured and going in the right direction and not having metal rubbing against metal. I would put a few drops of a good bike lube on the guides to help keep the cables moving freely.

+1. The industry wide trend for routing cable guides under the bottom bracket started in the mid-1980s, though cases can be found as far back as the early 1970s boom. It appears to have originated with high, Italian bicycles and trickled down. The area under the shell is more open, making it easier to thread the cables, at least for the rear derailleur, which is the cable most often replaced.

Originally, the guides were metal troughs or tunnels, brazed onto the shell. The plastic guides are simply a more economical solution, though they do have the advantage of providing less cable drag than a painted metal guide.

My concern was not with cable guides being under the bottom bracket. My concern was with the screw attached guides on this bike rather than having the guides be a designed part of the bottom bracket itself. Thanks for the immediate feedback!

My nago sprint has the plastic guide like that

At least they are removable/replaceable with the bolt like that, some are just riveted in,,,

Not even an issue...go ride and smile.