The fenders on Stromers are not conspicuous regarding defects. They are made of an aluminum profile, and newer models are also partly made of PVC. However, one point of criticism is the front fender, which is quite short, probably for design reasons. This reliably directs spray water towards the down tube, drivetrain (chainring, pulley), and pants during a rainy ride. 3D specialists have noticed this drawback and offer so-called fender extensions that can be attached to the front or bottom instead of the fender end caps.
The fender extensions from Van Zijp Technology Improve the splash guard. An additional mud flap (e.g. Rag | Mud flaps | Drivermakes it almost perfect, but it's not an aesthetic beauty. More about Stromer 3D accessories is also available here.
Some DIY enthusiasts have also developed their own solutions to improve the splash guard.
Those for whom these options are not enough can even have custom mudguards created for their Stromer. The Swiss company Pletscher AG manufactures bicycle stands, luggage racks, and mudguards and offers a Fender Configurator to.
