V17 outcome 4 pt 3

Did You Know?.....• The earliest record of the wheel being used is in

Mesopotamia (Iraq) around 3500 BC as a potters wheel.

• The first vehicle recorded was a Mesopotamian chariot in 3200 BC and the first spoked wheel in Egypt around 2000 BC.

• The wheel was developed independently in Europe in 1400 BC. (without Middle Eastern influence)

• The Aztecs however reached great levels of sophistication without inventing it. In fact no western hemisphere civilization developed the wheel before contact with Europe.

Wheels n tyres

• Like tyres, wheels come in all shapes and sizes.

• Get it right and the result can be better style and superb handling

• Get it wrong and you can have a stylish heap of un-drivable scrap.

First things first

• It may seem obvious, but count the holes.

Then check the PCD (Pitch Circle Diameter)

'X' inches 'X' in mm = P.C.D.

2.351 59.715 4

2.498 63.449 4.25

2.645 67.183 4.5

2.792 70.916 4.75

2.939 74.650 5

3.233 89.586 6

3.820 97.028 6.5

2.314 58.779 100mm

2.499 63.481 108mm

2.591 65.832 112mm

2.777 70.535 120mm

3.008 76.413 130mm

3.240 82.290 140mm

3.703 94.046 160mm

Formula to work out 5 stud PCDs

Measure from inside edge of 1 hole to the

outside edge of the next and refer to chart

Just because you get the right number of holes doesn’t mean they are the same position as replacement wheels

Centre Spigot Diameter

• The studs do not hold the weight of the car. That is the job of the central spigot and therefore if the new one is too big the weight will be held by the studs. Use a spigot locating ring, as aftermarket rims are usually larger than the originals.

Einpresstiefe

• OK, offset, inset or outset. This is the way the rim sits on the car, does it stick out, set in or neither.

• This is the vital difference that could make the vehicle un-drivable.

Tyre bead profiles / rim contour designations

• J, JJ, K, JK, B, P and D relate to the shape of the rim that holds the tyre in place.

Hump profile

6J = 6” deep + bead shape code J

14” Rim diameter

Wheel offset in millimetres

Hump profile index