TREK 559538 Round Carbon Seat Mast Cap 601479788828 135 20MM

( Brand: Trek ), ( Manufacturer Part Number: 559538 ), ( Part Type: Seat Cap ), ( Compatible Brand: For Trek ), ( Color: Carbon ), ( Seatpost Type: Integrated Seatpost ), ( Item Length: 135 Mm ), ( Compatible Bike Type: Road Bike ), ( UPC: 601479788828 )

Review TREK Round Carbon Seat Mast Cap 135 20mm

Trek 559538 Round Carbon Seat Mast Cap (135mm, 20mm)

The Trek 559538 Round Carbon Seat Mast Cap is a sleek and durable upgrade for your Trek bicycle. This seat mast cap is precision-engineered to provide a secure and elegant connection between the seat post and the frame, enhancing the overall rigidity and performance of your bike.

Crafted from high-quality carbon fiber, this seat mast cap offers the ideal balance of lightweight strength and vibration damping properties. The round profile, with a diameter of 135mm, seamlessly integrates with Trek's carbon frames, creating a unified and aesthetically pleasing appearance.

The Trek 559538 Round Carbon Seat Mast Cap features a 20mm bolt diameter, ensuring a secure attachment to the seat post and the frame. Its sleek design and minimalist profile contribute to a clean, uncluttered look that bicycle enthusiasts will appreciate.

In addition to its functional benefits, this seat mast cap also adds a touch of elegance to your bike. Its carbon fiber construction offers a glossy, high-tech finish that is sure to turn heads on the road or trail.

Whether you're a dedicated road cyclist, a mountain biker, or a commuter, the Trek 559538 Round Carbon Seat Mast Cap is an excellent choice for enhancing the performance and aesthetics of your bike. Its durable design, secure fit, and attractive finish make it an essential upgrade for any Trek bike owner. Upgrade your ride today with the Trek 559538 Round Carbon Seat Mast Cap.

1. Lightweight: Made of carbon fiber, this seat mast cap is designed to be light, reducing the overall weight of the bike.

2. Aerodynamics: The round shape and carbon construction contribute to improved aerodynamics, which can help reduce air resistance and improve speed.

3. Compatibility: It is designed to fit Trek bicycles with a 135mm seat mast diameter and a 20mm post.

4. Durability: Carbon fiber is known for its durability, making this seat mast cap resistant to damage from impact and harsh conditions.

1. Cost: As a high-end product, this seat mast cap is more expensive than other materials, such as aluminum.

2. Availability: Due to its specific design for Trek bicycles, it may be less accessible to those who do not own Trek bikes.

3. Fragility: While carbon fiber is durable, it can be brittle and prone to damage if not handled correctly.

In conclusion, the Trek 559538 Round Carbon Seat Mast Cap 135mm 20mm is a high-quality product that offers improved lightness, aerodynamics, and durability. However, its cost, limited availability, and potential fragility should be considered before making a purchase.

If you own a Trek bicycle, value lightweight components, and are willing to invest in a high-end product, this seat mast cap could be a worthwhile investment. Alternatively, if you are looking for a more affordable option or do not own a Trek bicycle, you may want to consider other alternatives.

Details:

Does not include saddle ears. Offset: 20mm.

part #: 559538 prices

• $124.99-$229.99

specifications ribicycl:

• brand: Trek
• mpn: 559538
• part type: Seat Cap
• compatible brand: For Trek
• color: Carbon
• seatpost type: Integrated Seatpost
• item length: 135 Mm
• compatible bike type: Road Bike
• upc: 601479788828

seller ribicycl:

• city: Columbus, Wisconsin
• rating: 100.0%
• # reviews: 871

general ribicycl:

• Cycling > Bicycle Components Parts > Seatposts
• condition: Used

returns ribicycl:

• policy: No Returns

offer ribicycl:

• quantity: 1
• options: Ship-to-home
• availability: In Stock
• started: January 9, 2026
• sold: 0

payments ribicycl:

• wallet: Google-pay
• other
• credit card: Diners-club

shipping ribicycl:

• service: USPS Ground Advantage
• carrier: USPS
• type: Fixed
• cost: $30.00
• transit: 5-13 Days
• class: Standard

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