PAValentine
Finally riding a big boys bike
It appears to me, here in North Central Texas at least, that the most common ratios on 1-inch chain gearing is 26 teeth on the front and 10 on the back.
With New Departure 2 speed hubs, all I have seen come with a 12 tooth cog. I don't recall seeing anything smaller. So then compared to a single-speed, that hub is an underdrive hub to begin with. So high gear then would already be a 2 tooth, or around 18% lower gear than the normal single-speed. Then the low gear then would be even lower.
Am I missing something here? If the most common/normal single-speed is 26/10, Why then go ND 2 speed, when the high gear is already lower than the normal gearing? Am I making sense???
Now for Bendix.
Every Bendix manual shift Aviation hub seems to be 1/2 inch pitch only. I have not come across one with a skiptooth cog. So assuming that the equivalent gearing of 1/2 inch chain compared to skiptooth would be a 52 tooth for the chainring. And that seems the most common size on the front. The Bendix 2 speeds seem to come with mostly 18 or 19 tooth hub cogs.
(So if the normal gearing on single speed balloon tire bikes with 1/2 inch chain would be 52 on the front and 20 on the back, then that would be an equal ratio comparison to the 26/10 on skiptooth bikes.)
The Bendix then would have a slightly higher gearing in direct (High gear) drive, and a stepdown gearing on the low gear side. (underdrive)
To me, the Bendix set-up makes more sense than the ND 2-speed, which appears to start out lower than the norm, then goes down even lower????
Am I missing something here regarding the New Departure gearing on their 2-speeds, or are there actually smaller cogs than the 12 tooth? Perhaps they were only intended for use in a very hilly region of the country where a lower gearing was standard on a single-speed????
Any Thoughts?
With New Departure 2 speed hubs, all I have seen come with a 12 tooth cog. I don't recall seeing anything smaller. So then compared to a single-speed, that hub is an underdrive hub to begin with. So high gear then would already be a 2 tooth, or around 18% lower gear than the normal single-speed. Then the low gear then would be even lower.
Am I missing something here? If the most common/normal single-speed is 26/10, Why then go ND 2 speed, when the high gear is already lower than the normal gearing? Am I making sense???
Now for Bendix.
Every Bendix manual shift Aviation hub seems to be 1/2 inch pitch only. I have not come across one with a skiptooth cog. So assuming that the equivalent gearing of 1/2 inch chain compared to skiptooth would be a 52 tooth for the chainring. And that seems the most common size on the front. The Bendix 2 speeds seem to come with mostly 18 or 19 tooth hub cogs.
(So if the normal gearing on single speed balloon tire bikes with 1/2 inch chain would be 52 on the front and 20 on the back, then that would be an equal ratio comparison to the 26/10 on skiptooth bikes.)
The Bendix then would have a slightly higher gearing in direct (High gear) drive, and a stepdown gearing on the low gear side. (underdrive)
To me, the Bendix set-up makes more sense than the ND 2-speed, which appears to start out lower than the norm, then goes down even lower????
Am I missing something here regarding the New Departure gearing on their 2-speeds, or are there actually smaller cogs than the 12 tooth? Perhaps they were only intended for use in a very hilly region of the country where a lower gearing was standard on a single-speed????
Any Thoughts?
