My family has a road bike, set with Altus 9-speed shifters and a rear derailleur, paired with a Shimano HG200-9 cassette.
Recently, I replaced the cassette with a 10-speed road bike cassette, As a result, it can shift gears, and all 10 gears on the rear derailleur can be accessed. Some shifts are quite accurate, but some require two clicks to engage. So, I have a few questions:
If I switch to a 10-speed chain, will the shifting become more precise? Read in some forums that the cable pull ratio for 10-speed and above systems on mountain bikes and road bikes is different. Can I keep the Altus left shifter and replace the right shifter with a Tiagra sh-4700, while retaining the original Altus derailleur?