Avg ?

[jimboalee]

http://www.letour.fr/indexus.html

Tour 'Live' animated pictorial.

I understand what 'km done', 'km left' and Speed mean, but I have to assume 'Avg' is cadence.

Just now, the speed was 47 kmh and Avg was 77. This corresponds to 53 x 11.
Now they've gone to 36 kmh and 76, which computes to 53 x 14.


Confirm?

 

[jimboalee]

http://www.letour.fr/indexus.html

Tour 'Live' animated pictorial.

I understand what 'km done', 'km left' and Speed mean, but I have to assume 'Avg' is cadence.

Just now, the speed was 47 kmh and Avg was 77. This corresponds to 53 x 11.
Now they've gone to 36 kmh and 76, which computes to 53 x 14.


Confirm?

Now it's 43kmh and 74, which is 53 x 12.

So they don't 'Spin' then.

 

[jimboalee]

Now it's 43kmh and 74, which is 53 x 12.

So they don't 'Spin' then.

Now it's 36kmh and 73. 53 x 14.

No, they don't 'spin'.

 

[Dan B]

"Doesn't seem to work in Firefox", I was about to post. Then it opened 15 new windows at once. Oh, ok, it does work in firefox, it's just slow to start

Be interesting to know what the chap at the front is doing. Drafting makes a huge difference

 

[jimboalee]

Now it's 36kmh and 73. 53 x 14.

No, they don't 'spin'.

Now it's 39.6kmh at 70. 53 x 12.

 

[garrilla]

I saw the other day that Polar are streaming telemetry data back from their HRMs on the ride, its possible this has cadence too.

 

[Will1985]

It won't be that gear at all. The Garmin boys are the best to look at as they usually publish the powertap files. That average includes coasting, and given that they say someone who sits in the pack all day on a flat stage is freewheeling about 45% of the time, 77 would be a rider who is actually doing some work at the front of the peloton

 

[Dan B]

That's neat, Will. For anyone else interested, try http://www.slipstreamsports.com/category/tech-training/ and yuo can click through to the detailed bits including cadence vs time graphs and other stuff. I'm looking at Wiggins in the Giro, who seemed to be doing 80-100 most of the time except when freewheeling

 

[jimboalee]

Now they're on the climb.

25.2 kmh, 66. 53 x 17....

That's about how I ride.

 

[jimboalee]

Can't imagine they'll be freewheeling up a Cat 4 climb.

Question is, whose cadence are we looking at?

I notice the Avg drops on the descents, yup, freewheeling.

Wait for the Alps.

 

[jimboalee]

I had a think about this on my ride home yesterday.

The sensor signals that inform the computer when the crank magnet has passed are timed. After a few pulses, the avg cadence is calculated.
In the same way as you don't have to be riding for one hour to get a mph readout.

When the rider stops pedaling, the sensor signals stop and a 0 avg is recorded.

The readout on the TdeF website shows the integer of a value that is greater than zero, so IMHO, it is a realistic number for when the rider is pedaling.

On the down gradients, the rider will be 'idling'. Simply rotating his cranks slower than needs-be.