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Which ratio does a typical passenger car final drive provide?

  • A.Between six and eight to one, which is the range used on light commercial vehicles with larger road wheels
  • B.Between three and four and a half to one
  • C.Between ten and fifteen to one, which is required in order to reduce the engine speed sufficiently at the wheels
  • D.About one to one

Answer: B

Car final drives lie in the region of three to four and a half to one, with the gearbox supplying the remaining reduction. Commercial vehicles use higher ratios. The overall reduction in first gear is usually twelve to fifteen to one. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Naming what changes and what stays the same is the reliable route through questions of this shape.

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