Bosch Drive and Gear Inches
03-19-15, 04:24 PM
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Bosch Drive and Gear Inches
Looking at the Felt SPORT e - the crank says it's 18t... looking at the photo doesn't appear to be a typo. That makes the biggest gear a 18/11 or about 44 inches.
So how do you keep any chain tension for motor assist when 15mph is 120rpm? Seems like I'm missing something. Is there another chain drive between the crank and the motor sprocket?
So how do you keep any chain tension for motor assist when 15mph is 120rpm? Seems like I'm missing something. Is there another chain drive between the crank and the motor sprocket?
06-13-15, 01:39 PM
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New Bosch drive has 1:2,5 gear between crank and primary chainwheel build in, thus making the primary chainwheel work like a 18x2,5=45 tooth
This looks much better doesn't it?
This looks much better doesn't it?
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pengyou
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