I am 5’8" 158lbs what kind of watts do i need for a six hour bike. just curious. I know lots of variables but a range would def help. thanks
112 in 6 hours is about 18.75mph… no more than 175 watts at absolute most, my guess somewhere around 150-160w based on your weight
Go out and ride 18.75 mph and look down at your PM.
except that if you’re out there for 6 hours, the wind starts to kick up and all of the sudden you’re pushing 250 watts downhill and going 17mph… 
How can you not know this if you been training with power?
You are asking for an absolute number when you need a relative number (% of ftp).
This is dependent on your weight, aero-ness of position and other factors.
except that if you’re out there for 6 hours, the wind starts to kick up and all of the sudden you’re pushing 250 watts downhill and going 17mph…
X1…This course rewards a good swim/fast T1 more than most. Between the extra first loop traffic you face and the winds at the end of the day, the difference between getting on the road by 8:10 vs. 8:30 is more than 20 minutes.
<150watts
.