Planet Bike Grunge Board Mud Guard
Planet Bike

Planet Bike Grunge Board Mud Guard

$12.99
In Stock

The Planet Bike Grunge Board is a durable downtube mud guard that blocks spray and grit from the front wheel. Flexible plastic construction and two-point rubber strap mounting give quick, secure fit and easy removal.

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Product Details

Overview & Technology

Planet Bike Grunge Board Mud Guard (PN 130144, MPN 7003) is a compact, high-coverage downtube fender designed to stop mud and road spray before it hits the frame, headset and cockpit. Made from durable, all‑weather plastic, the Grunge Board offers a lightweight solution for riders who want more protection than a minimalist flap without the bulk of full-length mudguards. Key technical details: 95mm fender width gives broad coverage across a range of tyre sizes; universal wheel‑tire compatibility makes it suitable for gravel, cyclocross and mixed‑surface bikes. The guard ships at 0.25 lb with compact packaging (15.6" x 5" x 2"), so it’s easy to carry as a spare or fit for seasonal use.

Key Features & Benefits

Durable, weather‑proof material: The Grunge Board is molded from a flexible plastic that resists cracking, holds shape in cold conditions and bounces back from light impacts. That flexibility also reduces stress on mounting straps and stays forgiving around tight clearances. Two‑point rubber strap attachment: Quick‑release rubber straps anchor the guard securely to the downtube and crown area for stable coverage without tools. The two‑point system minimizes flapping and ensures the guard tracks with wheel movement, cutting spray to keep your bars, brakes and bottle area cleaner.

Fit & Compatibility

The Grunge Board uses a down tube mount style and is listed as a universal fit for wheel and tyre sizes, making it an ideal add‑on for gravel and mixed‑terrain bikes. With a 95mm width, it covers typical 28–45mm gravel tyres and most mountain bike tyres while still fitting close to the fork arch on many modern frames. Installation is simple: wrap the supplied rubber straps around the downtube and fork crown or lower head tube area as required. Because the guard attaches to the frame and fork rather than to brake or wheel hardware, it generally fits bikes with suspension forks and rigid forks alike — always check clearance around thru‑axles and fender mounting points before final fitment.

Who It's For

The Grunge Board is perfect for gravel riders, commuter cyclists and anyone who rides in wet or muddy conditions but prefers a low‑profile mudguard. It’s aimed at riders who want quick, removable protection for the frame and components without installing full‑length mudguards. If you race cyclocross, explore wet gravel routes, or ride year‑round commuter miles, this guard reduces cleaning time, protects bearings and electronics from grit, and keeps your cockpit drier and safer in splattery conditions.

Key Features

  • ✓ Down tube mud guard designed to block front‑wheel spray and grit
  • ✓ Durable flexible plastic construction resists cracking and weathering
  • ✓ 95mm width provides broad coverage for gravel and mixed‑surface tyres
  • ✓ Two‑point rubber strap attachment for tool‑free, secure mounting
  • ✓ Universal wheel/tyre compatibility for quick on‑and‑off use
  • ✓ Lightweight—ships at just 0.25 lb and easy to stow in a pack
  • ✓ Compatible with most suspension and rigid forks with clearance
  • ✓ Model PN 130144 (MPN 7003) — Planet Bike Grunge Board variant

Specifications

Fender Mount Type Down tube
Fender Width 95mm
Color Black
Material Plastic
Primary Color Black
Wheel-Tire Size Comp. Universal

Product Identifiers

Vendor Item # 7003
UPC 642016700309

Frequently Asked Questions

Will this fit my gravel bike with 40–45mm tyres?

Yes — the Grunge Board's 95mm width and universal wheel/tyre compatibility are designed to cover typical gravel tyre widths up to ~45mm. Always check frame and fork clearance at the crown and lower downtube before riding to ensure there’s no rubbing.

How does the two‑point rubber strap mounting work?

The guard attaches using two rubber straps that loop around the downtube and fork crown or lower head tube area. The dual anchors reduce flapping and hold the guard in position while staying tool‑free for quick removal and reinstallation.

Is the material durable for winter use?

Yes — the Grunge Board uses a flexible, all‑weather plastic that remains resilient in cold temperatures and resists cracking from repeated flex. It’s built to handle road salt, mud and gravel impacts common in winter riding.

Can it be installed on bikes with thru‑axles or suspension forks?

In most cases yes — because it mounts to the downtube/fork crown rather than axle hardware, it works well with many suspension and thru‑axle setups. However, check for clearance around the lower head tube and any integrated sensors or hoses before final fitment.

Does it interfere with front brake function or steering?

No — when installed correctly the Grunge Board sits clear of brake calipers and steering components. Make sure straps are routed away from brake hoses and steering cables and test full lock to lock steering before riding.

How do I clean and maintain the guard?

Rinse with fresh water after muddy rides and wipe down with a mild detergent for tough grime. Inspect rubber straps for wear and replace if they become brittle; the plastic body can be cleaned and stored dry when not in use to prolong life.

Buying Guide

When choosing a downtube mudguard, prioritize coverage, mounting security and material durability. Look for a guard wide enough to shield your downtube and headset without contacting the tyre, and choose flexible plastics or composite materials that resist cracking in cold weather. Attachment style matters: rubber strap systems like the Grunge Board are fast and tool‑free, ideal for riders who want seasonal or ride‑day protection. For permanent protection or heavy‑mud conditions, consider full‑length mudguards; for lightweight, on‑demand coverage, a downtube guard is a compact, effective compromise.

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