Home > All Products > DRIVETRAIN > Bottom Brackets > RISK 155 Aluminum Alloy Hollow Crank Arm Cap Bolt — M18/M20 × 9mm BB Bottom Bracket Dust Cover for Mountain & Road Bike, 10mm Hex Drive,

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RISK 155 Aluminum Alloy Hollow Crank Arm Cap Bolt — M18/M20 × 9mm BB Bottom Bracket Dust Cover for Mountain & Road Bike

Name: RISK 155 Aluminum Alloy Hollow Crank Arm Cap Bolt — M18/M20 × 9mm BB Bottom Bracket Dust Cover for Mountain & Road Bike
Brand: DJC Bikes - DJC Components
Price: 1.2 USD
Availability: InStock

$1.20 ~~$1.66~~

-28%

RISK 155 Aluminum Alloy Hollow Crank Arm Cap Bolt — M18/M20 × 9mm BB Bottom Bracket Dust Cover for Mountain & Road Bike.

M20 Compatibility: for Shimano M4000 / M590 / SLX / XT / XTR & similar hollow cranks.

M18 Compatibility: for Prowheel/Howow one-piece hollow cranks.

Options: M20-hollow-green; M18-hollow-blue; M18-hollow-green.

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Specifications
Warranty FAQ

RISK 155 Aluminum Alloy Hollow Crank Arm Cap Bolt — M18/M20 × 9mm BB Bottom Bracket Dust Cover for Mountain & Road Bike

The RISK 155 Hollow Crank Arm Cap Bolt is a precision CNC-machined aluminum alloy replacement cap for one-piece hollow crank systems. Designed to secure and dust-proof your bottom bracket spindle, this lightweight cap features a striking clock-face pattern with Roman numerals, a laser-engraved RISK logo, and clear size marking. Available in M18×9mm and M20×9mm specifications, each in 4 anodized colors (Red, Black, Blue, Green). Requires a 10mm internal hex wrench for installation.

Key Advantages

CNC machined aluminum — precise threads, smooth finish, no tool marks
Anodized coloring — durable, scratch-resistant, vibrant finish that won't fade
Laser-engraved logo & size marking — permanent, clean identification
Ultra-lightweight — M20 ~8.54g / M18 ~6.85g per piece
Clock-face design — Roman numeral pattern adds a unique custom look
10mm hex drive — compatible with standard internal hex wrenches
Dust & moisture seal — protects bottom bracket spindle from contaminants

Suitable For

Mountain bikes and road bikes with one-piece hollow crank systems
M20 for Shimano-style cranks (M4000, M590, SLX, XT, XTR and similar)
M18 for Prowheel/Howow-style one-piece cranks
Riders looking to replace worn or damaged stock crank caps
Bike enthusiasts who want color-coordinated drivetrain components

Notes

Confirm your size before purchase — measure the threaded hole diameter on your crank arm (M18 or M20). If unsure, use a caliper to measure.
Torque specification: 5–8 N·m — do not over-tighten
Requires a 10mm internal hex wrench (not included)
Package includes 1 crank cap bolt only; crank arm and bottom bracket shown in photos are for demonstration
Anodized colors may vary slightly from screen to physical product

Product Details

Specification	Details
Brand	RISK
Model	155
Product	Hollow One-Piece Crank Arm Cap Bolt
Material	Aluminum Alloy (CNC machined)
Specifications	M20×9mm / M18×9mm
Outer Diameter (flange)	~28mm
Drive Type	10mm Internal Hex
Torque	5–8 N·m
M20 Weight	~8.54g
M18 Weight	~6.85g
Packaging Weight	~26g
Colors	Red, Black, Blue, Green
Surface Treatment	CNC Turning + Anodized + Laser Engraved
M20 Compatibility	for Shimano M4000 / M590 / SLX / XT / XTR & similar hollow cranks
M18 Compatibility	for Prowheel/Howow one-piece hollow cranks
Packaging	Blister pack, 1 piece, ~12 × 8 × 1.4cm
Key Feature	Material: Aluminum Alloy (CNC machined)
Compatibility	M20 Compatibility: for Shimano M4000 / M590 / SLX / XT / XTR & similar hollow cranks M18 Compatibility: for Prowheel/Howow one-piece hollow cranks

RISK 155 Aluminum Alloy Hollow Crank Arm Cap Bolt — M18/M20 × 9mm BB Bottom Bracket Dust Cover for Mountain & Road Bike

Available Options

Each row below is one available option combination. Choose the complete combination that matches your setup.

Option 1
M20-hollow-green
M18-hollow-blue
M18-hollow-green

All Taxes & Duties Included • Fast Delivery (8–12 Days) • No Hidden Fees • 6-Month Warranty

1 How long is the warranty?
We offer 6 months limited warranty to all products because of the quality defects. We offer lifetime payable repair service after the warranty.

2 Do need to pay tax duty when package arrive my country?
You no need to pay tax when package arrive your country, most countries in the world no need pay.
USA aslo no need tax duty and tariff, our carrier will cover it.

Brazil, Chile, Columbia clients need pay import duty when package arrive your country.

3 Can I return the goods if I am not like it?
Yes you can apply return and refund when you receive the product within 7 days. But as return shipping fee is relatively high when send back to China, so we suggest you consider and carefully before purchase.

Or you can send message to us and discuss technical issues to clarify if the products is what you need, and then pay after you sure your order is correct.

4 How long is the shipping time?
To most countries 7-15days can arrive your address. Pay extra 20USD if want ship by Fedex DHL UPS.

5 How can I know the tracking number?
We will send the tracking code to your email automatically after we send the package. check the track update here https://www.17track.net/en

Support email info@djcbikes.com

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