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Ruby code posted
created at 05 May 17:57

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class Gear
  attr_reader :chainring, :cog, :rim, :tire
  def initialize(chainring, cog, rim, tire)
    @chainring = chainring
    @cog       = cog
    @rim       = rim
    @tire      = tire
  end

  def gear_inches
    ratio * Wheel.new(rim, tire).diameter
  end

  def ratio
    chainring / cog.to_f
  end

end

# ~~~~~~

puts Gear.new(52, 11, 26, 1.5).gear_inches
390 Bytes in 4 ms with coderay