After doing some training rides on courses without bigger ups and downs where I didn't make significant elevation gains, a recent ride was in more rough terrain. Of course, the relief changes the average speed one can achieve and I was wondering, if there are some rules of thumb to estimate the influence of the relief.
From hiking I know there is Naismith's rule which allows to calculate the time needed for a certain route based on distance and elevation. I am aware of the fact that with cycling the rule would be less general and require more calibration depending on
- mountain vs. road bike
- different surfaces
- greater difference between uphill and downhill speeds.
On outdoors.SX.com also someone presented a slightly different approach that translates different parameters (elevation gain, trail conditions etc.) into distance travelled, which could be another useful approach here.
So my question is, is there some rule of thumb or a set of rules of thumb for cycling as well?