(8 customer reviews)

RX-921V Men’s Road/MTB Comfort w/ Anti-Microbial Microfiber Cover


Serfas® RX Saddles are designed to increase 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
  • Waterproof / Anti-Microbial Microfiber Cover
  • Length: 10.35″
  • Width: 6.92″
  • Weight: 528 Grams
SKU: RX-921V / 713835255506 Categories: , , , Tags: ,

Available on backorder


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-921V Men’s Road/MTB Comfort w/ Anti-Microbial Microfiber Cover

  1. Kevin S

    Great saddle ! I use this on a Giant hybrid touring bike and can ride comfortably for 60 plus miles with no pain and no numbness (with or without cycling shorts/bibs). It replaced a Unity saddle that came on the bike that was far to wide and to plush for hammering out long distance rides or aggressive sessions on the trainer. Sit bone support is perfect as I am +200lbs. I highly recommend this to anyone who plans to ride any distance beyond around the block”.”””

  2. Steven B.

    I have tried a number of saddles designed to reduce numbness over the past several years. This seat is a home run. No numbness with or without padded cycling shorts. In fairness, I have only been on short workouts (20-25 minutes), but this seat does the job; NO numbness, which was not the case with all of the other seats I have tried. I do have a bit of muscle soreness in the buttocks, but it is early in the season, and that should go away based on past history. I am really happy with this seat, and by the way, I weigh 260 pounds at the moment.

  3. Marc

    I got this one as a free replacement for a new bike, stock saddle which was coming apart at the seams. The saddle is well made but it just didn’t fit me right it was a bit too wide and short for me. I’m about 190lbs and 5’11 with shorter legs than average. I only ride about 4 miles to work and my rear would start to get num in that short distance. I was constantly moving around on it trying to find the right place to sit. Serfas makes good stuff so I’m sure it’s the right saddle for the right body shape. I got a much narrower and longer saddle of another brand that is working well. “

  4. john daugherty

    I tried many seats (my local bike shop allowed me to test a variety of saddles) and the Serfas RX has resolved issues with numbness. I regularly do 100 mile rides and have used this seat for over 5000 miles this year with no issues. I highly recommend this product.

  5. Brazilian biker

    Great saddle. Without numbness, pain and very, very comfortable.

  6. Larry Gossman

    I have been using this saddle since 1999. My wife and I have 9 bicycles including Mountain, Touring, Road and Tandem. We currently have 10 of these saddles in use and have only replaced a couple because we wore them out. Riding is our life and the RX-921 saddle helps make it all possible.

  7. alton davis

    I used the RX model as a replacement on my Giant Defy roadbike. I was pretty happy with the original seat and only chose to replace it because of a small rip in the covering. The Serfas was a great surprise, after the initial 12 mile ride I could tell that I felt less soreness than normal. Since then I’ve come to expect no rubbing soreness or walking stiffness after riding.

  8. John M.

    I just replaced my old saddle with the Serfas Rx model saddle and after a light 15 mile ride I already am kicking myself in the head for not listening to my bike shop and buying this saddle a year ago. Had I heeded their advise I would have had an even more enjoyable riding season last year. I highly recommend this saddle and can’t wait to enjoy mine tomorrow!!

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