'Soggy Arse Syndrome' protection for your treasured derriere, while frolicking on your fat bike.

  • Developed for fat bikes.
  • Stops your butt and the top of your seat post from getting clogged up.
  • Discreet and very effective.
  • Weighs just 45g.
  • No fasteners required. Our simple, clever design is quick to fit and secure once in place.
  • Easy to clean as it's flexible and opens flat. Simply wipe and you're done (the Butt Fender, that is).
  • Made in the UK from recyclable plastic.

Designed to fit standard double-steel rail saddles that don't have any 'daft bits' in the way. See images for clarification.

It's no secret that plastic is used in most of our products and this is simply because it's the best material for the job.

As a responsible manufacturer we are committed to sustainability; to produce and sell our products with minimal waste, minimal packaging and we recycle everything we can along the way. Each product is designed to serve its purpose over many years and is by no means a single-use plastic. When a Mucky Nutz product does eventually reach the end of its functional life, it can be fully recycled and we encourage customers to do so.

Length: 340mm
Width: 150mm
Weight: 45g

We are currently working on updating the fitting instructions across all our products. In the meantime, please follow the steps below. If you need assistance give us a call.

  1. Lightly squeeze the fender along the crease lines to form it into shape. Make sure it stays wider than the tyre width.
  2. Slot the 'wings' through the back of the saddle rails then reach in and pull the hanger downwards to clip onto the bottom rails, as shown in the images.
  3. Square the shape up and you're good to go.
Solo 20/12/2015

Excellent. Initial feel is of a good quality product. Easy fit. First few rides prove it does exactly what it says it does in the description. Very happy customer here.

AW71 14/01/2015

Super fender for my fat bike! Very light and sturdy! Fits perfectly my White 2Fat Interceptor fatbike!

Adrian 21/11/2014

I have been using this on my standard MTB and it is amazing. Works really well with my 2.3" tyres, and super light weight for my XC race bike too. Super easy to fit, I actually have a fizik saddle (antares) on the XC bike with a 'daft bit at the back' and don't have any issues. Would thoroughly recommend and delivery was super fast :)

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Fat Butt Fender, Black

  • Product Code: MN0038
  • Reward Points: 90
  • £9.00

  • Ex Tax: £7.50
  • Price in Reward Points: 900

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