Hi all,
Here are some data I collected since 2012 about rolling resistance of several tires. Nothing new, the faster tires are the sames that everyone knows, except these are road Crr values and so the measures are given for a couple of tires. The precision of the measurement is not the same than on roller test but is enough to distinguish between slow and fast tires. The size of the circle is a rough representation of the precision range of the measure (a mean of 3 laps at slow speed on a ~200m loop). I recently tested the new Vittoria Corsa Speed, butyl tube for the moment, and not coupled with the fastest tire (GP4000S) so hard to conclude yet:
Crr values seem low but:
a) The asphalt is good (see photo). With the same protocol, I have seen Crr~0.006 on another road.
b) I used a second PowerTap for some tires to check the Crr range
One of the tested tire was expensive and disappoint me a lot at the time, even today after 1000 kms.
Any guess ? Quite easy :-)
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Here are some data I collected since 2012 about rolling resistance of several tires. Nothing new, the faster tires are the sames that everyone knows, except these are road Crr values and so the measures are given for a couple of tires. The precision of the measurement is not the same than on roller test but is enough to distinguish between slow and fast tires. The size of the circle is a rough representation of the precision range of the measure (a mean of 3 laps at slow speed on a ~200m loop). I recently tested the new Vittoria Corsa Speed, butyl tube for the moment, and not coupled with the fastest tire (GP4000S) so hard to conclude yet:
Crr values seem low but:
a) The asphalt is good (see photo). With the same protocol, I have seen Crr~0.006 on another road.
b) I used a second PowerTap for some tires to check the Crr range
One of the tested tire was expensive and disappoint me a lot at the time, even today after 1000 kms.
Any guess ? Quite easy :-)
Blog | Twitter| Bike CdaCrr app