Jens Voigt going for Hour Record 18 Sept

[V12man]

Not sure but my guess is that all pro peloton bikes are at legal weight limit so it makes no difference to add 6.8kg to every calculation.

You weren't a math major were you?

 

Try it with a few different rider weights and you will see.....

[King_Crispy]

Ai, ai, ai Dr Lambo.

Be nice, this is a "Love Jens" topic

[Tumbleweed]

Odd question for the trackies...do you think the length of the velodrome could have any effect on the speed a rider could maintain? Jens did it on the shorter version, right?

[andydude]

Odd question for the trackies...do you think the length of the velodrome could have any effect on the speed a rider could maintain? Jens did it on the shorter version, right?

The only thing that I can think is that on a shorter track with steeper sides it might be slightly more difficult to stay as close as possible on/near to the black line around the bends. But the difference might be very small.

[Tumbleweed]

The only thing that I can think is that on a shorter track with steeper sides it might be slightly more difficult to stay as close as possible on/near to the black line around the bends. But the difference might be very small.

Good point. Maybe it's just a case of perception, but, from a spectator's point of view, the shorter track seems faster. Too much overthinking on my part, methinks...

[andydude]

You weren't a math major were you?

 

Try it with a few different rider weights and you will see.....

I was thinking about this, and from what I can see, the sport scientists only divide by rider weight and not bike too. Not sure why, but I'll try to find out more.

[V12man]

I was thinking about this, and from what I can see, the sport scientists only divide by rider weight and not bike too. Not sure why, but I'll try to find out more.

Kind of easier.... (actually it's just simpler) but the bike is a constant for most individuals, so when looking at individual performance improvements it is irrelevant - BUT when looking at comparative performances between athletes then it makes a difference (and realistically only on the uphill bits).

 

So lets make some assumptions to demonstrate that:

 

2 riders - 1 50kg, and the other 100kg

Bikes - lest just say these are both 10kg (although the farmgate for the 100kg Elite rider should weight a touch more)

 

Lets say both of these riders put out an FTP of say 5 w/kg when the bike weight is excluded.

 

This gives raw powers of 5 x 50 = 250w, and 5 x 100 = 500w

 

Then add the bike weights in to the calc

 

250/60 = 4.1666 w/kg

500/110 = 4.5454 w/kg

 

And THAT is a meaningful difference in performance on an uphill (where we assume wind resistance is zero, and the weight of the machine/rider combination is the primary resistive force)

 

Of course - when on a flat, when wind resistance is the primary resistive force, then we need to understand the relative cD ratios of the individual riders to see how they compare, and that may or may not be different for the rider/bike/riding position combinations. The fact of the matter is that few sport scientists have access to a wind tunnel to determine those factors for individual riders - thus - they ignore it... and do it the uncomplicated way (which is not necessarily better or worse either, because no bike race is solely uphill or flat, and riders don't maintain the same riding position during a race - to say nothing of the effect of drafting, road conditions, tire resistance, wind and wind direction and a multitude of other factors)

 

The math exists for doing this kind of complex calculation, but it's not really that useful to an individual coach - more relevant to a team manager making a team selection for a specific race.

 

So - is the mud more transparent now?

[SwissVan]

Has anyone got the actual power stats for Jens hour record?

 

Apologies if its already been posted here....i'm really sleg today

[nathrix]

Has anyone got the actual power stats for Jens hour record?

 

Apologies if its already been posted here....i'm really sleg today

 

You're welcome

[Red Zone]

Average of 412 watts for the hour

[SwissVan]

Average of 412 watts for the hour

 

Thank you

[SwissVan]

You're welcome

Now maybe your tip might work, my pleasure

 

Jen's POWER output:

 

[andydude]

Thanks V12, but I understand the maths. What I was wondering is why all the pseudo sport scientists that do all the comparisons don't divide by total weight to get w/kg. They are quite good at using different formulas to calculate watts so I'm sure it won't be difficult to add total weight instead of only rider weight.

 

Edit: For example with this chart they only used rider weight.

[Grebel]

That's your story and you stick to it 

[Wyatt Earp]

I see Jens achieved his goal.

[SwissVan]

I might clean my chain more often after hearing this @ 4:45