I am not sure how people know the grade of a hill either, other than
just by eyeballing it.

I would just eyeball it if it weren't right in front of my house.  In
fact the hill up to my house is the kind that I have generally avoided
on bike rides.  I've never ridden a bicycle up Moser or Centennial
here in the East Bay hills.

Since it is right here, what I do is take out my 4 foot level and a
ruler.  Just measure how high you have to elevate one end to make it
level.  rise over run.

On Jul 16, 5:56 pm, "David T." <davidtren...@yahoo.ca> wrote:
> I just looked up something that I read in Frank Berto’s book:
>
> “With a cyclist’s entire weight on the pedal, the maximum rideable
> gear in inches is seven times the slope denominator. Thus, a 1-in-10
> incline requires a 70-inch gear.”
>
> (In other words, on a 10 % slope, with all your weight on the pedal,
> and a 70-inch gear you would just be stationary. But in reality, if
> you pulled up on the handlebars, you could make a little progress. )
>
> If I work things out correctly, a 15 % grade would be 1-in-6.67. Using
> the formula above, this would give a maximum usable gear of 7 X 6.67 =
> 46.7 gear inches.
>
> ( That’s the maximum usable gear, not that it would be a fun ride. )
>
> I am not sure how people know the grade of a hill either, other than
> just by eyeballing it.
>
> But I can say, in my experience, riding a single-speed bike will
> gradually make you a better climber, so that after maybe six months or
> a year, you can go up  hills quicker and easier than you would have
> done previously in a lower gear.

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