Power Meters
CavMan
Posts: 3
Long time lurker.....
Me and a mate are thinking of buying a power meter between us as they are so expensive.
If we ride 2 a breast in the same gear at the same speed will be both be putting out the same wattage?
Me and a mate are thinking of buying a power meter between us as they are so expensive.
If we ride 2 a breast in the same gear at the same speed will be both be putting out the same wattage?
0
Comments
-
-
you will be within a certain range based on W/kg -
eg rider 1 - 50kg - 200W - 4W/kg
then rider 2 at 100kg would need to put out around 400W's
the deviations being due to frontal area, weight of bikes... - but more or less comparable - gearing wouldnt matter that much0 -
fiftyacorns wrote:you will be within a certain range based on W/kg -
eg rider 1 - 50kg - 200W - 4W/kg
then rider 2 at 100kg would need to put out around 400W's
the deviations being due to frontal area, weight of bikes... - but more or less comparable - gearing wouldnt matter that much
What? Weight is irrelevant if they're on the flat. If it's uphill you can't just pluck out the same watts/KG as a magic figure either - it depends on the slope.
If you can't afford a PM just hire one for a while along with a coach for the same period. That's a better use of money then a shared £1000 piece of kit that's only going to end in tears.The British Empire never died, it just moved to the Velodrome0 -
how is weight irrelevant?
Force = mass(kg) * acceleration
Power = Force * distance = mass(kg) * accelleration * distance0 -
No. Unless you are a clone of your mate.CavMan wrote:Long time lurker.....
Me and a mate are thinking of buying a power meter between us as they are so expensive.
If we ride 2 a breast in the same gear at the same speed will be both be putting out the same wattage?0 -
This might get interesting, so does mass matter on the flat or not? Physics lesson anyone?
0 -
Because when riding along at a constant speed, you are not accelerating and you are ignoring all the other resistance forces when looking at F=ma component alone.fiftyacorns wrote:how is weight irrelevant?
Force = mass(kg) * acceleration
Power = Force * distance = mass(kg) * accelleration * distance
Mass on the flat does have an impact on power requirement as rolling resistance is proportional to mass but that's a lower order effect compared to air resistance.
In essence there are many variables, the largest being aerodynamics and the next being mass when climbing/descending.0 -
Thanks for all your replies.
We've now sorted it out between ourselves by buying a Tandem.0 -
far too many trolls on here of late, and idiots who bite.0
