Last winter I used a Cyclops Fluid 2 trainer and rode on zwift. My calculated ftp test around 205 at the beginning of winter last year. This summer Triathlon races went pretty good and averaged 23-24mph every race. I now have a Kickr Snap and I did an updated ftp to get ready for this winter. I tested out at 154 ftp. Crazy low compared to where I think I was or should be. Also outside if I go on a 30 mile ride I can avg 20mph fairly comfortably but zwift really pushes me to try and maintain that. Any thoughts or suggestions. I have done some of the spin down suggestions.
The trainer you mention is a classic trainer and in Zwift based on zPower. This is only estimated power.
There is a good read from Zwift regarding zPower:
I have read some posts from people on the Zwift Facebook group that mention your old trainer and have gone to a new power based trainer. They have seen big differences as well.
Hope this helps. #rideon
Have you done both types of Spin downs? If you have that much of a wattage discrepancy that could be the problem.
Thanks. Huge difference tonight. I warmed up on trainer for 10 mins. Then I did both spin downs in the wahoo fitness app and not the wahoo utility app. did it multiple times. Went for a 40 min ride at a comfortable hard pace and averaged 22.6mph and swift said we have updated your ftp to 211 when I was done. So I will retest later this week and see where I am at. I feel much better about it now. How often should one do the spin down test. Every ride or just when noticing some discrepincy.
Good to read everything seems to work fine now.
How often you should do a spin down depends on how often you use the Kickr and for how long. I am using mine every week a couple of times and do a spin down once a month.
Good luck with your next FTP test.
With a Kickr Snap you do the 2 advanced spin downs when you first use it out of the box. The normal spindown should be done before every ride to check wheel tension on the roller.