Check your tires. The tread should wear evenly. The steering wheel should not "pull to one side or the other." If either of these is not correct then an alignment is needed.
Alignment rack, need 4 wheel alignment done
A two wheel can be done, but a four wheel is preferred.
if you have independent suspention front and rear chances are a 4 wheel alignment can be done typically front wheel drive vehicles but not all.
It is in the way you wheel wear. If you go to tyre centre they will be able to tell you if you need an alignment as they can see the way you tyres are wearing.
If your wheels are out of alignment and it was done wrong, you will notice that there is uneven or rapid tire wear. Another issue that comes up is if the car pulls or drifts away from a straight line.
If you changed them yourself it is recommended that you get an alignment done or do the alignment yourself. If a shop or mechanic did the work they should have done the alignment themselves.
Take it to an alignment shop to have a thrust alignment done
A alignment is needed if its pulling to one side. Where as a balance is needed if the car is viberating.
you should have a 4 wheel alignment done
It depends on the vehicle and what adjustments need done. On a newer alignment machine the angles can be measured in under ten minutes. Adjustments will vary up to a hour or two.
You take it to a mechanic. You need to do an alignment when anything is done to the front end.
The only that I know of is that you need an alignment.