About The Product
- Factory replacement high-performance disc brake pads
- Performance braking in extreme conditions
Upgrade your bicycle's braking performance with the Koolstop D635S Clarks Brake Pads - engineered for cyclists seeking reliable stopping power and durability across various riding conditions. Designed for compatibility with leading disc brake systems such as Shimano, FSA, Origin8, Clarks, and more, these high-quality brake pads deliver superior control whether you're on rugged mountain trails or urban streets.
Premium Materials & Engineering
Constructed with a durable sintered compound, the Koolstop D635S offers unmatched performance in extreme weather and demanding riding situations. The sintered metallic makeup ensures maximum heat dissipation, longer pad life, and consistent stopping power. Each pad features a copper-plated steel backplate for enhanced thermal management and corrosion resistance, guaranteeing longevity and reliable performance over time. For electric bikes (e-bikes), a ceramic backplate with an organic front is incorporated to optimize braking efficiency.
Innovative Components & Technology
These brake pads are engineered with meticulous attention to detail, fitting a wide range of disc brake calipers including Clarks M1, M2, M3, CMD-22, CMD-23, CMD-27, as well as FSA Afterburner and K-Force models, Origin8 Vise Hyd PM, and Shimano models like Deore, SLX, XT, and XTR series. The combination of sintered material and copper-plated steel backplates ensures rapid heat dissipation and minimal fade during intense braking.
Versatile Style & Use Case
Ideal for mountain biking, cyclocross, commuter, and performance-oriented riding, these pads provide precise modulation and powerful stopping capability. Whether navigating technical descents or cruising city streets, riders benefit from consistent feel, reduced noise, and predictable braking performance. The sleek steel backplate design complements any disc brake system, enhancing overall aesthetic and functionality.
Key Features & Specifications:
- Pad Style ID: 21 | Compatibility with: Clarks, FSA, Origin8, Shimano, and more
- Material: Sintered metallic compound for extreme condition performance
- Backplate: Copper-plated steel (standard); ceramic for e-bike models
- Design: Universal fit for a broad range of disc brake calipers including Shimano XTR, XT, SLX, Deore, and Clarks models
- Performance Benefits: Long-lasting durability, high heat resistance, and reliable stopping power in all riding conditions
Choose the Koolstop D635S Clarks Brake Pads for trusted quality and exceptional braking performance. Perfect for riders demanding durability, precision, and consistent control for every ride. Upgrade your brake system today to experience the difference that high-performance, SEO-optimized disc brake pads deliver.
- High-performance sintered disc brake pads with a durable copper-plated steel back plate, delivering optimal stopping power in extreme riding conditions for mountain biking, cyclocross, and off-road adventures.
- Made from advanced sintered compounds, these Koolstop brake pads provide superior fade resistance, long pad life, and consistent braking performance, ideal for aggressive riding and high-intensity cycling disciplines.
- Compatible with a wide range of Shimano, FSA Afterburner, K-Force, Origin8 Vise Hyd, and Clarks brake systems, including M1, M2, M3, CMD-22, CMD-23, CMD-27, and Shimano Deore, XT, and XTR models for versatile upgrade options.
- Designed with sleek materials and engineering expertise, these organic and sintered pad options suit different riding conditions-organic pads offer smooth, quiet braking, while sintered pads excel in wet, muddy, or demanding terrain.
- Featuring innovative ceramic-back e-bike pads with organic fronts, these Koolstop disc brake pads ensure reliable, consistent stopping power for e-bike riders, combining technology and style for superior control and safety.
| Specification | Value |
|---|---|
| Manufacturer | KOOLSTOP |
| Manufacturer Part No. | KS-D635S |
| Universal Product Code | 760251080342 |
| Invoice Description | BRAKE SHOES K/S DISC SHI XT SLX SIN M985/785/975 |
| Shipping Weight | 0.07 lbs. |
| Package Dimensions | 5.2 x 3.25 x 0.5 |
| Country of Origin | UNITED STATES |
| Pad Style ID | 21 |
| Compatibility | Clarks M1, M2, M3, CMD-22, CMD-23, CMD-27 / FSA Afterburner, K-Force / Origin8 Vise Hyd PM / Shimano Deore M615, SLX M666, SLX M675, XT M785, XTR M985, XTR M988, S700 (2011+), CX75 |
| Pad Material | Sintered |
| Compound | Standard |
| Brand | Kool-Stop |
| Backplate | Steel |
- Supplier:
- JBI
Bike Junkies offers no‑hassle returns and exchanges within 60 days of delivery. We want every customer to feel confident when shopping with us, and our return process is designed to be simple, fair, and fast.
Return Eligibility
To qualify for a return or exchange, the following conditions must be met:
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The item must be in new, unused, and uninstalled condition.
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All original packaging, tags, hardware, and accessories must be included and intact.
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Items showing wear, installation marks, damage, or improper use cannot be accepted.
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An order number is required.
Once your return is received at our warehouse, a refund will be issued within 5 days after inspection.
Refunds
Refunds are issued to the original form of payment once the returned item has been received and approved. If we are unable to refund to the original payment method, the refund will be issued as store credit.
Depending on your bank or credit card provider, it may take an additional 2–3 business days for the refund to appear in your account.
Exchanges
To make an exchange, simply complete the return process and then place a new order for the item you want instead. This ensures the replacement item is reserved and ships quickly.
How to Start a Return
To request a Return Authorization (RA#), contact us at support@bikejunkies.com. Please include your order number and the item you wish to return.
Once approved:
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You will receive a Return Authorization email with instructions.
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Print the prepaid label provided by us. ($9.99 will be deducted from your refund)
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Ship the item back within 7 days of the RA being issued as RA #'s are only valid for 7 days.
Please do not tape anything to the original product packaging. Place the item inside a proper shipping box. Using the manufacturer’s box as the shipping container will result in damage and the return may be rejected.
Be sure to keep your return tracking number. Powersport Junkies is not responsible for lost return shipments. You will receive a confirmation email once your return has been processed and refunded.
Defective, Incorrect, or Damaged Items
If you receive a defective, damaged, or incorrectly shipped item, contact us immediately. We will cover the return shipping cost and ensure the issue is resolved quickly.
Non‑Returnable Items
Certain items cannot be returned, including:
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Electronics with opened packaging or broken manufacturer seals
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Any part that has been installed or shows installation attempts
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Tools or chemicals that have been opened or unsealed
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Open‑box items with destroyed or missing packaging
Our Info
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Storefront name: Bike Junkies
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Address: 940 Calle Amanecer, Suite N
San Clemente, CA 92673 -
Phone: 800-605-2152
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Support email: support@bikejunkies.com
- Support hours + timezone:
Monday-Friday: 9:00 AM-5:00 PM PST
Saturday: 9:00 AM-3:00 PM PST
Sunday: Closed
This Shipping Policy explains how orders are processed, handled, and delivered by Bike Junkies, including delivery timelines, shipping coverage, and special conditions for military addresses. It is designed to give customers a clear understanding of what to expect when placing an order.
Bike Junkies is proud to be an authorized dealer of the brands we currently offer. When you purchase from us, you are guaranteed to receive genuine, brand-new products backed by the full manufacturer warranty. We work directly with the manufacturers to ensure you receive the highest quality service and support.
Order Processing and Handling
Orders are processed quickly to ensure fast delivery. Our standard handling time is 0–1 business days. Order cutoff time is 12 PM PST Monday-Friday and orders placed after that will be shipped shipped next business day.
Transit Times
Once shipped, orders typically arrive within 2–3 business days. Transit times may vary slightly depending on the destination, weather conditions, or carrier-related delays. Delivery estimates apply only after the order has left our facility.
Delivery Schedule
Standard delivery occurs Monday through Friday. Saturday delivery may be available.
Shipping Coverage
Bike Junkies offers free shipping to the lower 48 states of the United States. We do not ship to the following locations:
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Alaska
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Hawaii
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Puerto Rico
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Any international destination outside the United States
Orders placed with shipping addresses in restricted locations will be canceled and refunded.
Military Shipping (APO/FPO)
Bike Junkies ships to APO/FPO military addresses using USPS only.
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We cannot ship hazardous materials or oversized items to military addresses due to carrier and military mail restrictions.
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Transit times to APO/FPO locations may vary significantly depending on military mail processing.
Address Accuracy and Delivery Issues
Customers are responsible for ensuring that all shipping information provided at checkout is accurate and complete. Bike Junkies is not responsible for delays, lost packages, or delivery failures caused by incorrect or incomplete addresses. If a package is returned due to an address error, additional shipping charges may apply to resend the order.
Lost, Delayed, or Damaged Shipments
If a shipment is delayed, lost, or arrives damaged, customers should contact us promptly so we can assist with initiating a claim or resolving the issue with the carrier. While we support the process, final decisions regarding claims are made by the carrier.
Tracking Information
A tracking number is provided via email once the shipping label has been created. Tracking updates may take up to 24 hours to appear after the label is generated.
Shipping Restrictions
Certain items may be subject to shipping restrictions due to size, weight, or hazardous material regulations. If an order cannot be shipped due to such restrictions, we will notify the customer to arrange an alternative solution.
Our Info
-
Storefront name: Bike Junkies
-
Address: 940 Calle Amanecer, Suite N
San Clemente, CA 92673 -
Phone: 800-605-2152
-
Support email: support@bikejunkies.com
- Support hours + timezone:
Monday-Friday: 9:00 AM-5:00 PM PST
Saturday: 9:00 AM-3:00 PM PST
Sunday: Closed
For warranty issues please contact us at support@bikejunkies.com. Each Brand is different and we can provide instruction to complete warranty issues.
Bike Junkies is proud to be an authorized dealer of the brands we currently offer. When you purchase from us, you are guaranteed to receive genuine, brand-new products backed by the full manufacturer warranty. We work directly with the manufacturers to ensure you receive the highest quality service and support.
Our Info
-
Storefront name: Bike Junkies
-
Address: 940 Calle Amanecer, Suite N
San Clemente, CA 92673 -
Phone: 800-605-2152
-
Support email: support@bikejunkies.com
- Support hours + timezone:
Monday-Friday: 9:00 AM-5:00 PM PST
Saturday: 9:00 AM-3:00 PM PST
Sunday: Closed
