As the ad mentions, the seat is made for more level to upright type bicycles. I can assure you it's not made for racing bikes. I have it on my mountain bike. The T-Flex wings are so narrow, that it allows me to fully extend my legs without and intrusions from the seat. Examine the side profile picture in the ad and you'll see what I mean. I bike at least 20 miles a day and (Not A joy ride), I mean hard biking. It has made a huge difference since I've been using it. I definetely recommend it. My biking friend has bought one too.