RX-921L Men’s Road/MTB Comfort w/ Lycra Cover


SKU: RX-921L / 713835255483

Quick Overview

Serfas® RX Saddles are designed to maximize blood flow and alleviate numbness. If you are looking for the best in comfort and protection against perennial discomfort, then the Serfas® RX is the last saddle you will ever need.


  • Designed For Male Anatomy
  • Twin Bar Design
  • Steel Rails
  • Silk-Tech Lycra® Cover
  • Length: 263mm
  • Width: 176mm
  • Weight: 542 Grams

Available on backorder






Say goodbye to riding pains forever. Our RX line of saddles is the ideal choice to eliminate uncomfortable pressure and numbness around your sensitive plumbing by utilizing our clinically proven designs.

All Serfas® RX saddles incorporate anatomic-centered design and technologies to provide the best in comfort and protection so you can ride greater distances and for a longer amount of time.

  • Pressure Eliminating Channel

A deep anatomic channel through the center of the saddle allows maximum blood flow into the neurovascular bundle for drastically reduced numbness and discomfort.

  • Zero Friction Gel Infused Padding

Gel infused foam provides optimized saddle grip and support while reducing unwanted saddle friction and chaffing.

  • Twin Bar Anatomical Flex

Saddle halves rotate independently with the rider to reduce saddle friction and irritation.

  • Infinite Comfort System (I.C.S.)

ICS mates four unique layers of closed cell foam, gel, and microfiber materials to form a unified system of support and comfort.

  • Dual Density Base

Soft and flexible rubber-like material within the saddle base ensures the rider’s sit bones never contact a hard spot.

  • Pressure Reducing Two-Step System

Raised saddle tail profile helps alleviate pressure on the neurovascular bundle.

  • Four-Way Stretch Lycra® (*On Select Models)

Four-way stretch Lycra® material moves in all directions and behaves as a second skin thus reducing friction between rider and saddle.

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6 reviews for RX-921L Men’s Road/MTB Comfort w/ Lycra Cover

  1. Western Flyer

    After wearing out my first RX, I just purchased a second. It had almost daily city riding and over 5,000 kilometers of touring. It works for me.

  2. mortgmaker

    I needed something that would be comfortable for a 40+ mile charity ride. My LBS recommended this seat so I bought it. I used it the next day, rode 42 miles with no pain or discomfort. This seat is a winner in my book.

  3. irishskier

    Love this seat, holds up well given the very comfortable construction. A great value!

  4. ridingsoldier

    Stock saddle on bicycle left me with a numb groin. Purchased this saddle and it solved the problem.

  5. Jeff

    Honestly, by far the best seat on the market for me. I ride a little bit of both road and trails, and this seat stays comfortable throughout the entire ride. Takes all of the pressure of your sensitive areas. I would happily pay much more for this seat than what it sells for. Great product and I highly recommend!

  6. Chuck Bursack

    I have been riding on the RX921L for over 10 years (other Serfas saddles before that) and have worn out three of them, as I ride around 2,000 miles a year — I am 67 years old. Seats that came on bikes would make my right leg go completely numb. Serfas saved my day. I also managed a bike shop (now retired) and sold hundreds of RX saddles — only took one back in eight years! By far and away the best saddle EVER made!

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