The RISK RA139 Silicone Crank Arm Protector Covers are designed to protect bicycle crank arm ends from scratches, scuffs, paint chips, and daily impact damage. Made from soft, elastic, tear-resistant silicone, these covers fit securely over common aluminum alloy crank arms and help extend the service life and appearance of your crankset.
With high elasticity and strong compatibility, the RA139 protectors are suitable for many road bike, mountain bike, gravel bike, and urban bike cranksets. They are easy to install, provide practical protection, and also add a clean color accent to your bike setup.
Each pack includes 1 pair / 2 pcs, available in black, red, blue, and green.
Note: This product includes crank arm protector covers only. Crankset, chainring, pedals, and other accessories shown in images are not included.
| Item | Details |
|---|---|
| Brand | RISK |
| Model | RA139 |
| Product Name | Bicycle Crank Arm Protector Covers |
| Material | Silicone |
| Quantity | 1 pair / 2 pcs |
| Colors | Black, Red, Blue, Green |
| Weight | Approx. 16.8 g / pair |
| Packaging | RISK branded bag / card packaging |
| Application | Crank arm end protection |
| Compatibility | Common aluminum alloy road and MTB crank arms |
| Position | Approx. Size |
|---|---|
| Front Width | 33 mm |
| Side Width | 18 mm |
| Height | 39–44 mm |
| Bottom Width | 29 mm |
| Thickness / Opening Reference | Approx. 14–18 mm |
Measurements are for reference only. Please check the crank arm end shape and size before purchase.
Color: Black
Quantity: 2 pcs / pair
Recommended For: Minimal and classic bike setups.
Color: Red
Quantity: 2 pcs / pair
Recommended For: Red-accented or black-red bike builds.
Color: Blue
Quantity: 2 pcs / pair
Recommended For: Blue-themed road or MTB builds.
Color: Green
Quantity: 2 pcs / pair
Recommended For: Bright custom styling and high-visibility setups.
Helps prevent scratches, paint wear, and impact marks on the crank arm end during riding, parking, transport, or storage.
Made from high-elasticity silicone with good flexibility and tear resistance for reliable protection.
Designed to fit many common aluminum alloy crank arms used on road bikes, mountain bikes, and urban bikes.
The flexible silicone structure stretches easily over the crank arm end for quick installation and removal.
Available in four colors to protect your crankset while adding a personalized look to your bike.
