Sorry if this has been covered in a previous thread. Actually i'd be surprised if it hasn't, though i couldn't find such a thread.

Anyways, i am sort of modernizing what was a Takara 10-speed mixte from the late 70's. I'm ditching the derailuers and rebuilding the rear wheel with a Sturmey-Archer 8 speed hub. Along the way, i'll also be replacing the a few other components. I was thinking it'd be nice to put on a chainguard too (the kind that goes over the top of the chain and kind of wraps around the chainring, not a full chaincase). They seem to be readily available on ebay. Most of them are take-offs from old cruisers, stingrays, etc. Some, such as this are new and meant for lowrider-type bikes. I'm wondering how exactly these things are mounted and weather or not they're a one size-fits all type thing. It seems to me they probably aren't, since they would need to have varying radii for the front part to accomodate different chainring sizes. But none of the ones i've seen for sale have any such specifications listed, so maybe i'm wrong.

Does anybody have any experience fitting a chainguard to a bike it wasn't designed for?