Car Bibles The Wheel and Tyre Bible Page 4 of 4 — Volkswagen K 70

21 мая 2015 | Author: | Комментарии к записи Car Bibles The Wheel and Tyre Bible Page 4 of 4 — Volkswagen K 70 отключены
Volkswagen K 70

Wheel dimensions

Okay. If you to change the wheels on your you need to take some into consideration.

Number of or studs

It goes without that you can’t fit a 4-bolt onto a 5-bolt wheel Sounds obvious, but people been known to fork out for an set of alloy wheels only to they’ve got the wrong number of holes.

Pitch Circle

Right. So you know how many there are. Now you need to the PCD, or Pitch Circle . This is the diameter of the invisible formed by scribing a circle passes through the centre of each mounting hole in the image here). If you’ve got the number of holes, but they’re the spacing, again the wheel won’t fit.

PCD notation

Stud patterns and PCD are typically listed in this 5×114.42 . This means a pattern on an imaginary circle of diameter.

Centre spigot

This is a tricky one. are two types of axle/wheel design: and lug-centric.

For hub-centric designs, the is centred using the spigot the wheel nuts or lug bolts are In this design the spigot sticks out from the axle of the car is why it can be used to centre the wheel With aftermarket alloy the spigot hole is often than the spigot on the car which is why you a spigot-locating or hub-centric ring. is a plastic or metal doughnut matches the outside diameter of the spigot hole and the inside of the axle spigot, and is used to a snug fit between the two whilst the wheel.

For lug-centric designs, the wheel is during the process of tightening the lug often because the axle does not stick out (either at or far enough) to be any use in centring the wheel.

is very important. Ignore and you can end up with all manner of nasty This is the distance in mm between the line of the wheel rim, and the through the fixing face. You can inset, outset or neither. determines how the suspension and self-centring behave. The most obvious that will occur if you get it is that the steering will become so heavy that you turn the car, or so light you need to spend all your keeping the bugger in a straight More mundane problems ignoring this measurement can from wheels that parts of the bodywork or suspension, to judder

in the steering because the suspension can’t handle that type of wheel. This will be stamped on the wheel as an ET figure .

Inset and outset are subsets of and the relationship is this. positive = inset. Negative offset = Typically you can get away with difference from the vehicle specification before you’ll run trouble with the wheels the suspension or bodywork. So for example if stock wheels have an of 42mm and you can only find with a 40mm offset, 2mm difference ought to OK.


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