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Sorry, another Kurt Kinetic Post! - Page 2

post #16 of 20

Re: Sorry, another Kurt Kinetic Post!

Quote:
Originally Posted by kant314
Interesting.
I always clamp mine as hard as it will go. Untill I can't turn the knob any more.
That's probably too hard, I reckon.
I always use 2 turns of the knob. When my tire starts to slip (which inevitably it always does) I just run my sweaty glove over the tire and it's ready to go for another 1 hour.
post #17 of 20

Re: Sorry, another Kurt Kinetic Post!

Sorry to bump an old thread but this one seems to fit my current issue... Do you guys find the formula located at Stationary Indoor Bike Trainer - Kinetic by Kurt is pretty accurate for figuring out average power for an FTP test? Heres my issue.


I was off the bike all fall/winter and just started training again in April so I dont know my current FTP. Owning a old SL 2.4 wired PT I have been using the numbers it has been showing for FTP tests and my workouts but something has been telling me the watt numbers have been low by a good 30+ watts. That and the zero offset number on my PT (in test mode) is way off the 512 Saris recomends for proper operation.

Since I also own a KK road machine I have been doing my FTP tests indoors as I dont have a good 20 minute (or 1 hour) road to do outdoor testing. My first test came back with an average power of 200 watts.... Yeah I have been off the bike for 8 months and for this test only had about a month of time back on the bike but crap.... Guess I lost most of my 300+ FTP from last year

Fast foward 4 weeks and its time for another test. This time I get an average of 20.4 MPH and a PT reading of 235.... Improvement but it still seems low so I run my average MPH through the formula located at Stationary Indoor Bike Trainer - Kinetic by Kurt

Using this formula *assuming I did the math right* gives me an average power of 274.07... This seams and feels about right and adds more doubt in my head that my PT is working properly. What do you guys think?
post #18 of 20

Re: Sorry, another Kurt Kinetic Post!

I haven't used this formula in a while but as I recall that page has a typo it should be

P = (5.244820) * S + (0.019168) * S3

because the KK road computer entry is "1917"

assuming my math is correct 20.4mph=269.7w

The KK isn't perfect but compared to what the bike at the gym was estimating my power at it was much closer to reality.


Quote:
Originally Posted by wfrogge View Post
Fast foward 4 weeks and its time for another test. This time I get an average of 20.4 MPH and a PT reading of 235.... Improvement but it still seems low so I run my average MPH through the formula located at Stationary Indoor Bike Trainer - Kinetic by Kurt

Using this formula *assuming I did the math right* gives me an average power of 274.07... This seams and feels about right and adds more doubt in my head that my PT is working properly. What do you guys think?
post #19 of 20

Re: Sorry, another Kurt Kinetic Post!

Quote:
Originally Posted by wfrogge View Post
Do you guys find the formula located at Stationary Indoor Bike Trainer - Kinetic by Kurt is pretty accurate for figuring out average power for an FTP test?
If you use the corrected formula from the post above this one, yes.

I have found that a speed difference on my KK Road Machine intervals has identified an issue with my PT (later confirmed by torque measurement), so I'd say it's pretty good.
post #20 of 20

Re: Sorry, another Kurt Kinetic Post!

I don't know how accurate this is but I warm up on the KK for 10 minutes and do a count down test from 20 mph. Then I adjust the tension on the rear wheel until I get 13 seconds. I suspect it's in the ballpark for guesstimating wattages and it w/b consistant from ride to ride.
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