Quick Summary
The ROCKBROS adjustable bike fender is a rear mud guard for 26-29″ MTB bikes. It is made to help reduce splashes of water and mud on wet or muddy rides, and its adjustable struts support fitment across different bicycle geometries.
The design mounts on the front and rear forks rather than the seat post, so the seat post stays free and a rear light or pannier rack can still be used. The rear struts are stated as adjustable from about 28-32 cm.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Brand | ROCKBROS, helping identify the exact product line. |
| Product type | Adjustable bike fender / mud guard for a rear wheel setup. |
| Bike size | 26-29″ MTB bikes, so wheel size is the main fit check. |
| Mounting position | Front and rear forks, with the seat post left free. |
| Rear strut length | About 28-32 cm, which affects rear alignment and fit. |
| Front strut length | About 16-20 cm, which affects front alignment and fit. |
| Material | PP with reinforced PET rubber end section. |
What to Compare Before Buying
- Wheel size: This model is stated for 26-29″ MTB bikes. Compare that against your bike’s wheel size before choosing.
- Mounting layout: The fender mounts on the forks and does not use the seat post. Check that this setup matches your frame and accessories.
- Adjustment range: The stated strut lengths are about 28-32 cm rear and 16-20 cm front. Compare those ranges with the space on your bike.
- Rear accessory use: Because the seat post stays free, a rear light or pannier rack can still be used. Confirm that this fits your setup.
Before You Decide
Confirm the 26-29″ MTB fit, the fork mounting setup, and the stated strut lengths before choosing an offer. If you need a different wheel size or a different mounting style, compare another version first.





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