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Trainer tyres

  • 13-04-2010 3:16pm
    #1
    tunney
    Registered Users, Registered Users 2 Posts: 12,584 ✭✭✭✭


    Anyone have any experience of the heat dispersion properties of the various trainer tyres? Anyones better than others at maintaining their termperature?


Comments

  • #2
    blorg
    Registered Users, Registered Users 2 Posts: 15,995 ✭✭✭✭blorg


    I only have experience with my Tacx one (blue) but it seems to work fine.

    Are you having issues? IIRC you said once you just used old tyres?


  • #3
    tunney
    Registered Users, Registered Users 2 Posts: 12,584 ✭✭✭✭tunney


    blorg wrote: »
    I only have experience with my Tacx one (blue) but it seems to work fine.

    Are you having issues? IIRC you said once you just used old tyres?

    I did when I was using my SRMs on a fluid trainer.

    But now I use the power reading from a computrainer - wheel speed affects tyre heat which affects rolling resistance which can knock the power readings off. It can be bad if you say ride a 20% hill (low wheel speed, high torque = cool tyre) into a 20% descent(high wheel speed, low torque = hot tyre).


  • #4
    blorg
    Registered Users, Registered Users 2 Posts: 15,995 ✭✭✭✭blorg


    tunney wrote: »
    But now I use the power reading from a computrainer - wheel speed affects tyre heat which affects rolling resistance which can knock the power readings off. It can be bad if you say ride a 20% hill (low wheel speed, high torque = cool tyre) into a 20% descent(high wheel speed, low torque = hot tyre).
    Does it make a big difference?

    I will wager you are not able to put out a lot of power on a 20% descent :)

    My own Tacx trainer has power but the internet is divided on how accurate it is... some reckon it is pretty solid if you calibrate it with a SRM/Powertap etc. The Computrainer power is meant to be pretty solid I thought.


  • #5
    tunney
    Registered Users, Registered Users 2 Posts: 12,584 ✭✭✭✭tunney


    blorg wrote: »
    Does it make a big difference?

    I will wager you are not able to put out a lot of power on a 20% descent :)

    My own Tacx trainer has power but the internet is divided on how accurate it is... some reckon it is pretty solid if you calibrate it with a SRM/Powertap etc. The Computrainer power is meant to be pretty solid I thought.

    Its bangon with SRMs (well a few % down but due to losses in transmission, quite interesting to see how your drivetrain can sap 4% if not properly maintained) - however wheels speed variations >30kph can introduce a level of error thats not quite okay. As in 200 CTwatts up a 20% hill will be 200 SRMwatts but after a few minutes going down the hill 200CTwatts will be 180 SRMwatts until the tyre cools down a bit more.

    This sort of issue will affect all the power trainers I believe.


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