The term Hi-Riser refers to a modified vehicle that has been modified in such a way to that the ground clearance has been increased greatly over the factory standard. This is achieved by adding large oversize wheels with very low profile tyres. The sizes of these wheels are typically between 20-26 inches but with the demand to get bigger and bigger some cars now feature 28 inch wheels and maybe more.
To get such large wheels to fit into the wheel arches the owners of the hi-risers have had to adopt modifications commonly seen on monster trucks and kits are available to give the car the required lift. Particular attention must be paid to the braking system due to the increase diameter of the wheels and the suspension in general which needs to be stiffened to avoid excessive roll when cornering.
Inexpensive automobiles are commonly used to create a Hi-Riser and the model and its age will determine which category the Hi-Riser is in. The most popular models that are used in the creation of a Hi-Riser are the full-size Chevrolet cars such as the Impala, Caprice, Monte Carlo, and Chevelle. A Box is usually a 1970-1990 Caprice or Impala and so called due to their squared off front and rear ends, giving a box-like appearance. A Bubble is usually a 1990 Caprice or Impala and so called because they are rounded at both ends.
A Donk is in a league of its own and is generally created from a mid 1970s Impala, Caprice and Monte Carlo or any mid 1970s ride with a sloping rear end. The stance of a Donk is very important and is slightly different to a Box or Bubble in that the front of the car is slightly higher than the rear, giving a nose in the air appearance. The name Donk has come from the "badonka-donk" noise that the rear suspension makes when it goes of bumps in the road.