The rear fender serves a number issues for me. I’ve continued to use the modified monkey nutz rear fender to prevent some mud on my back, debris on the dropper post and a keeping perfectly sized rock out of the pivot area. So far so good. Occasionally I get a rear tire buzz (6 times since install) but I just smack it with my hand and it stops.
I have removed the front fender though for looks.
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I’ve installed this exact same setup on several other Rails and the riders like this kind of protection. Modifying the fender to fit properly is key. Protecting the frame is also important.
There are a number of different fenders/pivot protection, but this method works for us.
I personally like the look now which is why I removed the front fender and kept the rear fender only. Only once I took a rock to my face from the front wheel, but I wear riding glasses.