German Engineering at its Best

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Deleted member 803

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Ravi, how do you compare the Dapu 350W with the new ST2 motor??
 

Cameron Newland

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J.R.

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I would really like technical specs as to the watt drain difference between belt and chain. It's well documented in motorcycling that a Gates belt robs horsepower to the rear wheel more than a chain. With a motorcycle it's insignificant due to the amount of available power. I wonder with a 250w-350w ebike, how much power/range is lost.
 

PowerMe

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My 350watt geared rear hub, going up a hill >5% grade isn't really able to do more than 11 to 13 mph, even with me pedaling. That's what I've noticed.
 
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Deleted member 803

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My 350watt geared rear hub, going up a hill >5% grade isn't really able to do more than 11 to 13 mph, even with me pedaling. That's what I've noticed.
Really, I can pedal up an 18% grade at 18mph on my Neo Carbon and about 23 mph on flat ground. Do you have an Easy Motion bike??
 

Cameron Newland

Well-Known Member
I would really like technical specs as to the watt drain difference between belt and chain. It's well documented in motorcycling that a Gates belt robs horsepower to the rear wheel more than a chain. With a motorcycle it's insignificant due to the amount of available power. I wonder with a 250w-350w ebike, how much power/range is lost.
There is 1-2W of drivetrain power loss using a gates carbon drive belt, however, that's in comparison to a well-lubricated chain, and since not all chains are optimally lubricated, the truth is that it's a wash. Belts and chains are roughly equivalent. The 1W loss would make a substantive difference for people who are only capable of producing 10W of power, but since most cyclists put out 75W-250W, I don't think that the 1W loss is big enough to matter.
 

J.R.

Well-Known Member
There is 1-2W of drivetrain power loss using a gates carbon drive belt, however, that's in comparison to a well-lubricated chain, and since not all chains are optimally lubricated, the truth is that it's a wash. Belts and chains are roughly equivalent. The 1W loss would make a substantive difference for people who are only capable of producing 10W of power, but since most cyclists put out 75W-250W, I don't think that the 1W loss is big enough to matter.
Is this information available? Who compiled it and on what equipment? I'd like to read it. The loss of power from just the belt on a motorcycle is 10-12% more than an o-ring chain. The belts are essentially the same.
 

Cameron Newland

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Brambor

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I ride a belt driven bike and can't really tell the difference between my chain powered bikes. Just that it is a huge PIA to change a rear tire. I have done that tonight and managed to mess up the rear wheel ... it's going to LBS tomorrow. Tire is changed but belt is inoperable :) I'm a lousy mechanic. :)
 

Cameron Newland

Well-Known Member
I ride a belt driven bike and can't really tell the difference between my chain powered bikes. Just that it is a huge PIA to change a rear tire. I have done that tonight and managed to mess up the rear wheel ... it's going to LBS tomorrow. Tire is changed but belt is inoperable :) I'm a lousy mechanic. :)
I'm afraid of experiencing that issue myself. To me, belt drives seem like the way to go, but apparently, the belt tension and belt alignment are both rather finicky and need to be adjusted to optimize performance and longevity, and as you said, taking off the rear wheel is a pain. I assumed that it would be easy, what with the purpose-built rear dropout that separates, but apparently it's not as easy as I assumed!
 
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Deleted member 803

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Every unique or new mechanical execution requires a learning curve of do's and don't's. From what I understand Gates technical support is excellent and I am sure that with a little training removing/adjusting the belt will be a no brainer.

http://www.gatescarbondrive.com/tech/resources
 
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So bummed that release date has been pushed to Q1 2016.
 

EbikeR2

Member
Thought I would share with you a photo of a redesigned stem that provides a hidden conduit for cabling to keep the look of the bike very clean.

The Model is a 2016 Kalkhoff Aventura Speed 1.0 and contains version 3 of their Impulse Drive. The bike now has 80nm of torque and runs quieter. In addition the display has a USB port for charging plus it will show turn by turn navigation.

I have to wait until the fall to receive, but I have no problem waiting.
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Gorgeous bike!