DIY Bicycle Fenders

Written by julia klaus
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DIY Bicycle Fenders
Construct a fender for your bike so that you'll stay dry even if the road is wet. (bicycle tire image by Leticia Wilson from

Commuting by bicycle is enjoyable in dry conditions but can be wretched in the rain or when the road is wet. A bicyclist without a back fender will quickly find herself with a long, wet stripe across her backside. Build a bike fender at home with minimal parts and cost to prevent getting drenched from the back tyre's runoff. For added protection, and to protect bicyclists behind you from getting splashed, attach a length of rubber to the bottom of the fender to act as a mud flap.

Skill level:

Things you need

  • Strip of aluminium
  • Sheet of corrugated plastic
  • Double-sided foam tape
  • Electric drill
  • Drill bit used for puncturing metal
  • Box cutter or utility knife
  • Spray paint in desired colour
  • Rubber, such as household stair treads
  • Zip tie or corresponding nuts and bolts

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  1. 1

    Purchase or cut a strip of aluminium to span the length from the bicycle's back post to the end of the tire. Bend the aluminium to fit onto the bicycle's rear mount without interfering with the brake calipers.

  2. 2

    Mark the spot where the fender will mount and drill through the aluminium. Bend the aluminium to match the slope of the wheel so that the fender will hug the shape of the tire for maximum splash prevention.

  3. 3

    Use a straight edge and a box cutter or a utility knife to cut the corrugated plastic into the desired shape of the fender. Measure the shape to ensure that it will fit and serve the intended purpose. Mark off with a pen and cut the corrugated plastic with the straight edge as a guide.

  4. 4

    Paint the corrugated plastic using spray paint to match or complement the colour of the bicycle. Spray in a well-ventilated or outdoor area. Allow the paint to fully dry.

  5. 5

    Attach the plastic to the aluminium and secure using double-sided foam tape. Add decorative features or cut the end to a point to personalise the fender as desired.

  6. 6

    Mount the aluminium and corrugated plastic fender to the back of the bicycle securely using the bicycle's mounting post.

  7. 7

    Measure the width of the end of the fender. Mark this width on the piece of rubber and determine how long the piece of rubber will need to be in order to prevent mud and water from splashing backward while riding.

  8. 8

    Cut the rubber using a box cutter or utility knife and a straight edge as a guide. Add reflective tape if desired to increase visibility at nighttime.

  9. 9

    Detach the fender from the back of the bicycle. Measure the end of the fender and the top of the mud flap. Drill two equally spaced holes into both services. Mount the mud flap to the bottom of the fender using either corresponding nuts and bolts or a zip tie.

  10. 10

    Reattach the fender to the bicycle using the rear mounting post. Trim the end of the rubber mud flap if it touches the ground while the fender is mounted.

Tips and warnings

  • Use spray paint in a well-ventilated area. Use caution when cutting materials.

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