Product Colors and Sizes

  • Black Friday product
  • New Deal product
  • Cyber Monday product
  • Clearance product
  • Deal product
  • Best Seller product
  • Ecodesign product
  • New product
  • Staff Pick product
  • In The News product
  • Innovation product
  • product

Btwin Flash, Road Bike Saddle Mudguard

Sale price: $3.00 Regular price: $4.99

A light, ultra-compact mudguard that easily attaches underneath the saddle. It protects the tops of the thighs from splashes thrown up by the rear wheel

Color: Select a color
Size: Select a size
Sale price: $3.00 Regular price: $4.99

Free shipping over $35

Final Sale: No returns or exchanges

See our return rules

Free pickup

San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8327786

Product Videos

Product Features

A photo of the Btwin Flash, Road Bike Saddle Mudguard in use

Btwin Flash, Road Bike Saddle Mudguard | We've designed this mudguard to protect the tops of your thighs from mud splashes when cycling.

A light, ultra-compact mudguard that easily attaches underneath the saddle. It protects the tops of the thighs from splashes thrown up by the rear wheel


Protects the tops of the thighs from splashes from the rear wheel

Easy assembly/dismantling

Installs onto the saddle of the bike using a clamp lock


Fits the vast majority of road bike saddles with 2 rails.

Compact design

Easy to carry anywhere, flat as a sheet of paper.

Product Customer Reviews

Skip to reviews
647 Reviews
Write a Review 

Btwin Flash, Road Bike Saddle Mudguard,black
Filtered by reviews Loading reviews…
Awesome fender

What a brilliant idea! Installs fast, no fastener or strap needed. Light weight, keeps the road dirt off your back. Even looks cool the way it attaches to the saddle. I have one for my mtb too.

Keeps the dirt off my ass

Does what it’s supposed to do

icon-circle-checkmark verified purchase

Great news, we are so glad to hear you're enjoying this product.

Works great !!


icon-circle-checkmark verified purchase

Hello Joey,

Thank you so much for leaving a review about this product, we are happy to hear that you like it!


Decathlon Calgary Team

Does the job, easy fit

Did rub saddle rails a little but otherwise easy quick fit if you CBA with mudguards

icon-circle-checkmark verified purchase

This One Fits Your Saddle And Stays Put .It also gives you good cover unlike most of these types of guards ⭐⭐⭐⭐⭐

icon-circle-checkmark verified purchase
Great for keeping your but dry

An amazing invention to keep your butt from getting wet

icon-circle-checkmark verified purchase
Simple, cheap and reasonably effective

Purchased this to hopefully stop my backside getting soaked without fitting mudguards and after first run in wet conditions all good , slight spatter on top of of my back , but that is to be expected. I was also still able to fit my saddle bag .

icon-circle-checkmark verified purchase
Simple and easy to fit.

Does the job, looks good and is good value.

icon-circle-checkmark verified purchase
Beware Saddlebags Preventing Fitting

Disappointed. Have just purchased two of these mudguards and tried fitting to two bikes (road & MTB) with different types of saddle with small saddlebags fitted underneath, and mudguard will not fit on any with saddlebag fitted. Now have the situation where it's either fit saddlebag or fit mudguard. Cannot fit both at the same time. Take note before purchase. As I cannot fit guard (hence 1 star), I can't comment on how good or bad it is at giving protection. I am now in the situation where I have mudguards that don't fit and it will cost more in fuel to return than initial cost. I feel a bit of bodging coming up to get them to fit.

Does the job

Cheap, easy to install and keeps the main spray off your back. If it's raining you'll still get a soggy behind though!

icon-circle-checkmark verified purchase
Splash appeal

Fitted it to my new Gravel bike. Brilliant. Easy to fit.

icon-circle-checkmark verified purchase
Simple enough to fit.

Bought this to fit on my young son's bike. He's not been out in the rain yet so can't comment on how it works. Athough this is just a piece of plastic, it's a very fair price compared to other rear mudguards. I have a similar one which is wider at the end and squarer, appreciate the ease it can be removed if needed and the small amount of space it takes up. Bought this one for his bike because it's slightly smaller (smaller looking anyway) but hope it stops the splashes up his back being that it is thinner at the end.

icon-circle-checkmark verified purchase
Value for money

Value for money

icon-circle-checkmark verified purchase
Very easy to install and remove

Versatile and practical

icon-circle-checkmark verified purchase


icon-circle-checkmark verified purchase
Skip to reviews

Additional Product Information



  • 100% Polypropylene


These new, ultra-compact and ultralight mudguards can be taken with you anywhere. They stop cycling shorts getting soaked at the buttocks and lower back, but do not protect your entire legs or back. The ideal companion for setting out to ride in changeable weather.



Storage instructions

Store flat.

Care instructions

Can be washed with water.

Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual