Hugh-Jassman
1 kW
- Joined
- Jun 20, 2015
- Messages
- 407
Ok, I have been racking my mind for a way to avoid using the bikes gears from a mid-mounted motor. Because I think it may produce too much chain wear from driving up our 8% grade with about 350-400lbs too often; and the gear changing problems.
This would last longer if I were to run a heavier BMX chain to the right sized sprocket cog, (or a Gates belt pulley) to climb our steep hills without bogging down. Leaving room for a 6 or 7 speed cassette; I do not know what size to put on the drive wheel, but would not be very large if the motor's second stage reduction output is only around 100rpm.
Will the motor bog down when climbing a 3-5% grade? Seems like the only drawback would be that the powered cruising speed would be so slow that I would want to use my legs. It seems like a fair trade off. What other problems could there be?
This will also make the bike more legal. It looks to me that if a mid-drive can drive your bicycle faster than 20 mph even with your cadence at 80 RPM, it can't be considered legal. Not that the cops care, but the lawyer of the drunk driver that runs into you could screw you to the wall.
This would last longer if I were to run a heavier BMX chain to the right sized sprocket cog, (or a Gates belt pulley) to climb our steep hills without bogging down. Leaving room for a 6 or 7 speed cassette; I do not know what size to put on the drive wheel, but would not be very large if the motor's second stage reduction output is only around 100rpm.
Will the motor bog down when climbing a 3-5% grade? Seems like the only drawback would be that the powered cruising speed would be so slow that I would want to use my legs. It seems like a fair trade off. What other problems could there be?
This will also make the bike more legal. It looks to me that if a mid-drive can drive your bicycle faster than 20 mph even with your cadence at 80 RPM, it can't be considered legal. Not that the cops care, but the lawyer of the drunk driver that runs into you could screw you to the wall.