On 06/12/2018 10:33 PM, Ron Mc wrote:
I wouldn't go random about it
Plug your cassette into _Mike's Gear Calculator
<http://home.earthlink.net/%7Emike.sherman/shift.html?R0=26&R1=42&R2=46&C0=12&C1=14&C2=16&C3=18&C4=21&C5=24&C6=30&C7=999&C8=999&C9=999&C10=999&CAS=0&WI=7&CR=170&RT=1&ST=0&RPM=90&SRT=0&lRPM=80&hRMP=100&G=show&S=yes&TITLE=Raleigh%20cyclotouriste%20triple&HL=1>_,
vary your chainrings and see what you get
The goal is wide range with narrow, useful steps - 5-8 inches for your
steps, especially in the range from about 60 to 80 inches, which is
where we mostly live.
Another goal is to minimize duplicates -
with a poorly designed drivetrain, you can have so many duplicates
that you have many fewer gears than you think you have.
On Tuesday, June 12, 2018 at 9:15:33 PM UTC-5, bo richardson wrote:
the standard 46 or 48
36
28+/-
Another important consideration is the crossover point. It's nice not
to be forced by angularity or simply running out of gears to shift chain
rings in the middle of the range Ron speaks of. Some chain ring
combinations force a shift as soon as the ground starts to rise, so
you're constantly changing back and forth for minor terrain undulations;
while others let you ride all day in the middle range and only require a
chain ring shift for serious hills.
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