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Turbo trainer fitness tests

  • 03-03-2010 5:44pm
    #1
    Ryder
    Registered Users, Registered Users 2 Posts: 995 ✭✭✭


    Hi everyone, want to do some fitness testing on the turbo to measure progress (20min TT) but wondering how to achieve consistency across measurements. Have a Tacx sirius and can microadjust the pressure against the wheel with a screw. Frequently remove the bike so am constantly adjusting the pressure to prevent slippage. This would be the only variable, tyre pressure is constant at 100psi. Does this matter?
    Thanks


Comments

  • #2
    Lumen
    Registered Users, Registered Users 2 Posts: 31,234 ✭✭✭✭Lumen


    I doubt you'll get the accuracy you're after.

    10% more power could take a year of training, so improvements are likely to get lost in the noise.

    The only way to find out is to borrow a power meter and try and calibrate that way. Or just buy a turbo with power measurement.


  • #3
    Murph100
    Registered Users, Registered Users 2 Posts: 1,088 ✭✭✭Murph100


    Yeah, forget even the Tacx Fortius ( I have one ), if you want accurate power measurement you need a powermeter. You could try and have a standardised set up, just check on the Tacx forum.

    Generally most of the guys on Tacx use 110 psi, 3 full turns from first contact, and calibrate after 15-20 mins warm up.

    Provided you stick to the same procedure every time you test, you should be ok, but again, there is no substitute for a real powermeter.


  • #4
    Ryder
    Registered Users, Registered Users 2 Posts: 995 ✭✭✭Ryder


    Lumen as usual thanks for the common sense reply - thats pretty much what I thought
    Murph that sounds like a good idea but I think ill miss out on the acccuracy I want. Ill check out the forum though, thanks


  • #5
    Murph100
    Registered Users, Registered Users 2 Posts: 1,088 ✭✭✭Murph100


    Ryder,

    Yeah its a bit of a quick fix but some get by fine on it, as long as you dont expect the figures to be the same as a 'real' powermeter, to be fair to the Tacx route, what you're after is consistent 'relative' values based on a standardised procedure which can work pretty well PROVIDED you repeat the exact same procedure everytime you test.


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