Originally Posted by Mojo31

I have a 2020 Specialized Sirrus 4.0, and am considering a Domane SL5. I’m curious as to whether the Domane would be faster, and if so, how much so. Obviously, the motor determines the speed for the most part, and aero drag from the more upright position would be greater on the Sirrus. I’m typically averaging 14 to 15 mph over 20 miles (no wind or big hills) with the Sirrus on the MUP. Assuming the same motor (me) and same gearing, will the lower more aero driver position allow use of a higher gear at the same effort and result in a noticeable difference in speed? In other words, will the road bike and lower position get me there quicker for the same effort?

This may be a silly question, but I’d like to have an idea of what type of performance increase if any I would see in the more expensive bike.