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your forks do have some torsional force and movement when riding... is not a necessity especially if you dont ride aggressive. But fork braces have been known to get rid of wobbles some guys have experienced when cornering hard.
Unless you have a wobble than you can trace to the front forks or want to get it for looks... there are better places to spend the money.
Stand in front of your bike.
Place front edge of rim and tire between your knees firmly and grab the handlebar handgrips.
Try to shake/ move the handlebars and "feel' if the wheel moves with the bars or if the wheel does not move with the bars.
IMO that's the test.
If the rim doesn't move with the bar you have "fork flex" and can benefit/ improve handling with a fork brace. Reducing high speed wobbles may be the biggest handling benefit.
FWIW Superbrace makes a nice product; I have not bought one because of price.
I read an article on fork braces a while ago. It is imperative you install it correctly so the forks are parallel throughout the full operating range or else one or both can bind during an "inopportune" time. Follow installation instructions and take for a thorough test ride before carving canyon roads.
Probably 20 yrs ago, I bought a new Kaw Concours. This was after a long line of BMW's the last of which pizzed me off at BMW. The first ride on the freeway with the Concours was down right scary. The first ride after the install of a fork brace, problem solved.
They work, and if you need one, it can transform your bikes handling. I would suspect that few new bikes nowadays need them unless you are in the 2% of riders that can push past the limits of stock bikes.
Back when I rode dirt bikes in the '70's, fork braces were much more common fitment on both street and dirt bikes. These days, with front ends typically being more robust than they were in those days, fork braces are less common.
A fork brace (Screamin' Eagle back then) made a noticeable improvement in handling on my 1990 FXRS-sp "Low Rider Sport". That model had long forks, though ...
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