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Watt about power to weight ratio?
Nov 4th, 11. Coach Ferg dissects Stage 6's SRM data from the warmth of his home in Christchurch and ponders on its use in the time trial.
Southland always has a way of saving the worst to last. Weather that is. Sounds like it got quite nasty out there for the riders.
The great thing about assessing a rider's performance is that I can sit in Christchurch miles away from the action and still have a pretty through understanding of what is happening in the race.
Just Gordon McCauley and Peter Murphy's power files today. Not surprised if there are a few sore boys who are hoping they can hang on one more day although it's fairly tight at the top and the time trial could really shake things up.
Again no difference in power till we look at power to weight where things swing in the People's Champion favour.
Power to weight is easy to determine although on flatter stages it is better to determine power to frontal area although this requires specialist testing with a power meter or a wind tunnel and in a race a rider will change position often and depending on the conditions may use a different set of wheels which will change the frontal area.
Saturday is the individual time trial. A feature in Southland that we haven't seen in years.
At the UCI World Time Trial Championships all three medallists in the Pro Men's race used SRM Power Meters to measure their effort.
Bradley Wiggins used his to judge his pacing as well. It was noticeable that he paced his ride the best starting slower than both Tony Martin and Fabian Cancellara and held his speed on the final lap. Not enough to match Martin but notable that Cancellara who tried to match the German on the first lap faded badly towards the end.
Will we see riders use the SRM to pace their efforts in the time trial?
A common strategy is to determine how long the ride will take and then base the first half of the ride on a power output the rider can sustain for that duration to ensure they don't start too hard and then if they feel good to start lifting on that power for the second half.
The riders have one stage after the time trial and the finish circuit around Queens Park will be a sweet sight for the battered and bruised riders.
We will analyses the power files from the final stage and thanks to GMC will be able to assess the power required to ride the whole tour and thanks to Peter will be able to offer some insight on just how good you have to be to pop ya Southland cherry!
By Hamish Ferguson
See previous SRM data analysis ....
PowerNet Tour of Southland - Sun Oct 30th to Sat Nov 5th
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