The main reason you’d add a fork brace to your motorcycle would be to stiffen up the front end and help eliminate things like vague steering and speed wobbles, this could be either at varied speeds or as you corner shifting direction.

Older bikes used to have much thicker front mudguards and even had braces welded on the underside of the front mudguard (fender) that would help stiffen the front ends, but as times have changed and more modern plastics and thinner materials are used for the mudguards a brace is required to help with handling. 

Fork Braces aren’t all made alike however, the improvement you’ll gain from fitting a brace to your motorcycle will vary greatly depending on several factors; The material quality, the manufacturing process, the R&D and testing done on the product, to name only a few. 

At BFB we stand by our fork braces, we put a great deal of time and effort into every aspect of our products, from material to testing - we pride ourselves on delivering quality.