Switching from hybrid to road bicycle For nearly 3 years now, I have been using a 21-inch hybrid bicycle (Fuji Absolute 1.9D).

My use of the bike is primarily for aerobic exercise. I ride about 20 kilometres in the morning for about an hour.

Now I'm planning on switching to a road bike. The purpose of use remains the same -  aerobic exercise.

I ride only on tarred roads.  I don't go off the road.

Now, my questions are:


Am  I making the right decision?
My bike dealer tells me that the size of the road bike should be one less than a hybrid. That is, if my hybrid is Large then my road bike should be Medium. Do you agree?


Thank you.
Road bike sizing seems harder to get right than more upright bikes. Your dealer may be right, but only as a starting point - that's a good size to test ride first. If your dealer wants you to buy the next size down without trying it first, you don't need a new bike, you need a new dealer. 

You have to think about your goals. Road bikes are more aerodynamic and therefore more efficient. So you'll get less exercise for the same distance, or go further in the same time. You may want to go further if you enjoy it more.