(8 customer reviews)

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


Serfas® RX Saddles are designed to maximize blood flow and alleviate numbness. If you are looking for the best in comfort and protection against perineal 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: 10.35″
  • Width: 6.92″
  • Weight: 542 Grams
SKU: RX-921L / 713835255483 Categories: , , , Tags: ,

In stock (can be backordered)


90 Day Comfort Guarantee
We understand finding the perfect saddle can be tough, which is why every Serfas® saddle sold is backed by our 90-Day Comfort and Satisfaction Guarantee

Limited Lifetime Warranty
We stand behind our products and are committed to providing the high quality all of our customers deserve which is why Serfas® warrants to the original purchaser of a saddle that the product is free from defects in materials and workmanship for the lifetime of the product. (See details)



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.

8 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!

  7. Jerry McLendon

    This bike saddle is truly just what the doctor ordered! I have used this saddle for many years on 3 different bikes. If and when, I order a new bicycle, I go ahead and order the RX 921L for the new bike! I will be 72 years young in a few months and I regularly ride 40 – 70 mile rides with absolutely no discomfort. Of course, proper installation and adjustment is critical. Serfas, thank you for an excellent product!

    • Serfas

      Jerry, Thank you for your feedback and support! We’re proud to play a small part in what helps to keep you riding and racking up the miles! Stay well and thank you again – The Serfas Team

  8. Austin J Braas

    Not a customer yet but will be soon after doing some independent researching reading reviews. Excited to own my first Serfas RX 921L! 30 years young and going strong, exciting for my biking adventure(s) 💪😀

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