Do they work or do they do more damage than good?

http://www.realcycles.com/products.php?plid=m24b0s211p1526

Ive seen that as opposed to the expensive £30 models

got one on my spesh.it,s a spesh one from the u s of a.
a neat little device that fits most mech,s by means of diferent length hex bolts.it realy locks up solid and is well strong.
if your going to get one try and find one of these.
there a lot better than the one you showed.about the same size but the screw you see on yours is hex shaped to fit the hex in the mech then it tightens via a bolt through the hanger..spot on.rocksolid

It means your mech breaks rather than your hanger. I know which I’d prefer…

It means your mech breaks rather than your hanger. I know which I’d prefer…

…so essential for those rare and slightly ill-thought-out bikes without a bend-able or replaceable hanger. There was a bloke on here the other day who had to buy a new seatstay for his scott genius; that’s why I have a hanger banger on mine.

On a somewhat related topic, do those breakaway bolts still exist?

I’d love a hanger banger on my Meta, but I have a 12mm Maxle fitted so I don’t think it would fit.