[hweel-beys, weel-]
noun Automotive.
the distance from the center of the front-wheel spindle to the center of the rear-wheel axle.

1885–90; wheel + base1

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World English Dictionary
wheelbase (ˈwiːlˌbeɪs)
the distance between the front and back axles of a motor vehicle

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Footprint is defined as the product of the vehicle measurements for wheelbase
  and average track width.
The truck was top-heavy due to the short wheelbase and the additional weight of
  the added tank and water.
In effect, the maximum allowable weight increases as the number of axles and
  the overall wheelbase increases.
The load shall not extend to the rear more than two-thirds of the wheelbase.
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