I´m doing an IM this summer and have gps files for the track.
What I would like to do is calculate the time for the bike if the average is a certain watt for example 200W.
How would it be possible to calculate the time?
I don´t care about the wind, aero etc.
Just plain calculation on watt and the course.
Power will influence speed depending on “wind, aero, etc”, which will in turn determine your ride time.
You want your course time, with watts only, completely ignoring aerodynamics, friction, wind, etc? Your speed at a given wattage is basically completely dependent on your aerodynamics. A small guy on a tricked out Shiv might do a flat IM course at 4:50 @ 200 watts while a fattie on a mountain bike would do the same in 7 hours @ 200 watts.
I´m doing an IM this summer and have gps files for the track.
What I would like to do is calculate the time for the bike if the average is a certain watt for example 200W.
How would it be possible to calculate the time?
I don´t care about the wind, aero etc.
Just plain calculation on watt and the course.
Your answer will then be very wrong.
ok,I understand.
If I add the weigth of the bicycle and the rider and calculate with an “normal” setup (not extreme perfect and not bad either) estimation of the lets say wind, aero, friction too.
Still possible in a simple way?
ok,I understand.
If I add the weigth of the bicycle and the rider and calculate with an “normal” setup (not extreme perfect and not bad either) estimation of the lets say wind, aero, friction too.
Still possible in a simple way?
+/- 30 minutes or so.
if you have some previous results, with both power and time, it will help you make better guesses on the important varaibles.
You’d be better off just spending this extra time doing some actual training than trying to figure out something that will not be beneficial.
You’d be better off just spending this extra time doing some actual training than trying to figure out something that will not be beneficial.
There are some good reasons to have an idea of how long it will take. It affects target power, and how many calories/water to bring with you.
Generally you can get this from past results, training rides though better than math alone in a vacuum…
so yeah, go do a 112 mile training ride at intended power and you have your answer =)
Thanks for the link.
I may perhaps find another riders power during the whole course.
so yeah, go do a 112 mile training ride at intended power and you have your answer =)
I realize knowing your estimated time is a good thing, no doubt. But using a website for that? Isn’t this is what training is for OP? Sometimes its fun to figure out stuff on your own : )
There are some good reasons to have an idea of how long it will take. It affects target power, and how many calories/water to bring with you.
Generally you can get this from past results, training rides though better than math alone in a vacuum…
so yeah, go do a 112 mile training ride at intended power and you have your answer =)
That was my idea to find out an approx time on the figures that I have now and the target that I have this summer.
Of course I can use the standard 75-80% of my ftp but I will still not know my time 
Joe Friel’s book and/or blog will give you the best answers for anything power related.
Joe Friel’s book and/or blog will give you the best answers for anything power related.
Using his book and Hunter Allens in my daily training.
A must for everyone training with power.
cool thanks for the link. for some reason the bike splits keep returning a negative number.
EDIT: Nevermind
Simple IM bike test
Find a 40km course you can do that mimics the terrain of the IM
do a 40km TT… add 10 minutes to your time… multiply by 4.5
ex… 1 hour TT, add 10 min to make it 70 minutes… x 4.5= 315… = 5:15 IM bike split
You might want to check out BikeCalculator or this Speed/Power calculator Not sure how accurate this will be or how to figure out how your course profile can be figured out unles its flat
.
Bikecalculator was awesome… Thanks
From several data points in your racing you’ll know how fast you will go with a given power.
You can go to analyticcycling.com put in your weight and stuff and then adjust the drag to match up with your speed and power from above.
Then you can create a speed/power curve in excel for the approx speeds you will be racing at. With that you can estimate the time it will take you to complete a course at a given power. That normally gets me within 3 minutes on a HIM ride. (Courses will need to be similar as testing)
You can also plan realistic power goals for the race from that like ~70% for IM or ~80% for HIM and see how long you’ll be out there.
I can show you my sheets if you want.
jaretj
The more information the better
.