Fat Butt Fender
Tax included
'Soggy Arse Syndrome' protection for your treasured derriere. Lightweight, discreet, and very effective, the Fat Butt Fender helps keep your backside clean and comfortable while you ride your fat bike
Technical Shizzle
- Works well with all bikes with fat bike tyres up to 4.8" wide
- Fits most standard double-rail saddles
- Blocks mud and water from soaking your backside
- Made from Mucky Nutz signature high-performance material
- Tool and fastener-free, fitting in seconds
- Ultra-lightweight
- Specifications: 35g, 360mm length, 150mm width
Eco Credentials
- Made in the UK from 100% recycled plastic
- Ships flat to cut packaging, storage, and transport emissions
- Built to last, not for landfill
- No packaging, zero, zilch, nada, nowt
- Fully recyclable
Perfectly partnered with
what makes it great
- The OG Fat bike saddle-mounted guard
- Feather-weight peach protection
- Minimalist design
- Tool and fastener-free installation
- Made in the UK, from 100% recycled plastic
- Zero packaging and single-use plastic
- Fully recyclable
Curvalicious
Having curves in the right areas, the Butt Fender offers greater protection for your perfect peach while eliminating any possibility of it getting caught on your tyre, at full drop - the fender, not your butt.
FASTENERS? PFFT!
The profile of the Butt Fender is enough for you to attach it to your saddle without the need for additional fasteners.
Eco-Savvy
UK-made from 100% recycled, fully recyclable plastic, the Butt Fender uses our signature high-performance material.
No fasteners needed, it clips straight to your saddle rails, and with zero packaging, it’s just as kind to the planet as it is to your backside.
FAQs
What bikes does it fit?
The Fat Butt Fender will fit any bike with standard saddle rails, regardless of wheel diameter, but it’s best suited to fat bikes with tyres up to 4.8" wide.
What does it do?
It blocks mud, water, and road or trail spray from hitting your backside. Translation: you finish your ride with a happy bottom.
How do I fit it to my bike?
No stress, no sweat. It simply slots between your saddle rails - no tools or fasteners required. Follow the Fitting Guide for a quick visual if you need it.
Can I leave it on all year?
Absolutely. It’s lightweight, silent, and happy to live on your bike through rain, mud, dust, and whatever else your commute or the trails throw at it.
What’s it made from?
Mucky Nutz signature, recycled polypropylene - flexible enough to shrug off knocks, UV-stable so graphics don’t fade, and rust-proof for all-weather riding.
Will it get in the way?
Not at all. Its slim design stays clear of your legs, pedalling, and dropper post movement.
How do I clean it?
A quick rinse or wipe down is all it needs. Avoid strong solvents and your graphics will stay looking fresh.
