FTP test on road or trainer

Will the loops require you stop and U turn every 2.5 miles? That won't be good for the test, especially if traffic causes you slow for longer than you had hoped at each turn. At your pace, I am guessing that will be every 5.5-6 mins.

I have a nice road here where I can ride for 30 mins with no lights, stop signs or turns to worry about. I liked to test on there. I find watts to be relatively the same indoor vs. outdoor, but cooling can be an issue inside, making those FT tests a lot more difficult.

bryancd - 2008-09-24 9:53 AM The repetition issue is a good point and one I didn't think of, I vote trainer!

flip-flopper

for the record, i vote trainer.  controlled, repeatable environment. 

Plus there is the get yelled at motivated factor being on the trainer. 

Repeatability is over-rated anyway

I vote road. Can you push yourself as hard on trainer as road? Have you been riding the trainer lately? If not does it take awhile to get into the rhythm of trainer rides for you like it does me?

I do mine on the same stretch of road that I do real TT in the summer on...

Interesting as my power can be higher but my time can be slower as it shows how weather, wind, etc effects time/pace. You are really going for power not time so weather shouldn't matter right?

All good points.  I do my week day riding on  my trainer because there is nowhere close to get a Z4 interval set in Atlanta without stopping.  My weekend riding is done on the road.

Much to my shagrin, I've been doing a lot of trainer riding this season.  Maybe I can find a cop willing to escort me through Atlanta traffic...