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Wir machen Ergometer mobil ! We make your bike a mobile ergometer !
SRM POWERMETER
PM98Pro
 The Powermeter is a computer designed torque transducer made of highest quality alloy that transforms the force on your pedals (torque) and the cadence into a digital electrical signal that is transmitted telemetrically (inductively) to a sensor on the bicycle frame. The power measuring ensues reactionless, thus no energy gets lost. The Powermeter is temperature compensated, 100% linear, waterproof and has a running time for 1 battery life of 50.000 km or 2.00 hours of training. After this time the battery might easily be replaced. Picture open PM.
The SRM Powermeter is available in 3 different types: 
ROAD     MTB   TRACK

and with 3 different accuracies of power measurement :  

AMATEUR 
5% Road for Shimano compatible chainrings (130 mm pitch circle) 
PROFESSIONAL 
2% Road, MTB (for 110 mm pitch circle chainrings) and Track for track chainrings 
SCIENCE 
0.5% Road and Track (for 144 mm pitch circle chainrings ) 

Crank length are available from 165.. 182mm for Shimano round axle, Shimano old 103mm axle and Campagnolo 102mm axle. 
For laboratory tests a special crank is available, you can change the length from 150mm to 190mm in 2.5mm steps. 
Chainrings are available in all sizes
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