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Dura Ace Pulleys. (Here fitted with the original steel bearing). |
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Some pulleys are fitted with a ceramic bushing instead of ball bearing. Like this Shimano Ultegra. The bushing generates higher friction than a steel ball bearing, and 30-60 times higher friction compared to a ceramic ball bearing. |
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Pulley Wheels with the original bearings. When set in motion the pulley stops after half a revolution. |
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Pulley Wheels now modified with ceramic bearing and non contacting seal. The friction is low enough that the pulley will spin by it's own gyroforce for more than 30 seconds after being fingered in motion. |
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This particular pulley wheel has been used for more than 2 seasons, in total +20.000 km. The bearing is still perfect and the wear on the composite pulley is minimal due to the fact that our hybrid bearings, generates minimum friction torque. This means that the pulley wheel will accelerate faster from 0-500 RPM and the wear on the composite material will be less than normal. Actually our calculations and measurements show that the energy consumption on pulley wheels with our bearings is reduced between 15 and 25 times (depending on the standard set-up) |
