General > General Technical Chat
how does Campagnolo automatically detect the teeth on the bicycle sprocket?
Someone:
--- Quote from: CatalinaWOW on August 25, 2022, 11:35:02 pm ---I never got good enough to automatically select gears. Easy enough to change up and down through the sprocket range, but since the ratios from the chain rings overlap so much any time I changed the ring there was a period of hunting for the right sprocket gear. A single lever system that picked equally spaced overall ratios would have really appealed to me. Even better two levers, one to bump up/down one gear and another to bump up or down say five ratios fort those rapid changes needed at the tops and bottoms of hills. Never saw anything that seemed both light and reliable.
--- End quote ---
Part of this is that the gear ratios aren't designed for convenience or ease of use but for racing, the overlap was intentional for 2 reasons:
racers want to always have spare up/down gear or two at a moments notice without the slow change of the front
some chains cant bend enough to use the full width of the rear gears
So the shift between the front gears had to be matched with 3-6 "shifts" in the rear which would vary depending on both the specific ratios assembled/setup and the to-from gear ratios in use. As mentioned above, its only the newest electronic shifting sets (also eyewateringly expensive) that now enable it to be seamless (fast) enough that a single up/down control is possible....
Which reached the market at almost the same time as wide range 1x (only single gear at the front) specific rear gear clusters, so for the "normal" around town rider there are two good options:
gear hub (the price puts some people off)
1x11/1x12 with a 1:4 range or higher
DiTBho:
--- Quote from: CatalinaWOW on August 25, 2022, 11:35:02 pm ---I never got good enough to automatically select gears. Easy enough to change up and down through the sprocket range
--- End quote ---
I don't do any climbs because I have a back problem, long journeys but all in the plains, I noticed I am using the same setup 52 { 13, 15, 17}
Only and always the same gears
- tours within the city, 52-17
- urban stretches, 52-15, 52-17
- extra-urban stretches, 52-13
- stretches along the sea or lakes, 52-15
speed between 27 and 35Km/h, low rpm, old steel-frame bicycle, Campagnolo Mirage 1992
I cannot do the same with any Pinarello Prince, Paris, Razha (worse still with my Monza Wr) with Shimano Ultegra bloody thing, they have a completely different gears-setup, and I have to continuously shift up and down like a deranged dog on speed because I never find the optimal ratio.
DiTBho:
--- Quote from: Someone on August 26, 2022, 02:18:56 am ---Which reached the market at almost the same time as wide range 1x (only single gear at the front) specific rear gear clusters
--- End quote ---
Single gear at the front looks like what nowadays they call Gravel-profile, optimized for long travels (>200Km) and comfort
I am more for Endurance-profile, optimized for short travels (<150Km) on 32Km/h average speed with a bit of comfort
Decathlon has some interesting bicycles, but no gear-hub.
--- Quote from: Someone on August 26, 2022, 02:18:56 am ---gear hub
--- End quote ---
Can you convert a vintage bicycle into gear-hub? 3 speeds would be OK for me.
1x3 :o
thm_w:
The point of having easy gear ranges is that you can put the same low effort into climbing as riding on the flat :)
https://www.youtube.com/watch?v=ipENw5mjjSg
But I might know what you mean, it seems to engage the back muscles more than flat riding.
You can convert any bike with a standard quick release dropout spacing of 127-135mm to a nexus gear hub. Don't really know if its worth it though.
https://www.sheldonbrown.com/nexus-mech.html
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