I don't feel that these people are right for me and I don't want to upset anyone by being rude. I just don't know how to go about it nicely

Can you provide a few more details? Like how long have they been "friends"? What exactly have they done to make you feel this way?

I have known them a 1 1/2 and a half. They seem to be OK if its just them. But I'm not so keen on their other relations its just the way the behave, I mean there is not much in common they don't have anything decent to say apart from rubbish talk

It sounds as though they aren't really close friends, so just letting more and more time lapse between the times you spend with them will allow you to distance yourself from them. You can still be polite when you see them, chat a bit for example, but you don't have to go out and do things with them.
Start to make other friends that you have more in common with and you will be spending more time with your new friends.
Some friendships last a very long time, if one is lucky, but most friendships fade with time.

I agree with the other poster, you can just let these friendships fade out. Get busy with new friends, fill your time with hobbies you are interested in, that will not only put you around the type of people you'll find more in common with, it will also offer a good excuse to turn down plans with these friends you want to move away from.

It's also perfectly acceptable to turn down plans simply because you aren't up for it, or it isn't what you would like to do. They may take it personally, but you know you don't mean for it to be, and so just remain kind and firm in your goals. If they make a big deal about it, just realize they are acting inappropriately, thus confirming that they aren't the circle of friends you want, and don't engage in any nonsense.

They are not all bad some of the group are OK, but the others are not which I avoid meeting though. They always acknowledged me passing in the car which is good

Also they asked me one time weather someone we both know if she knew we meet up which is odd

The thing is we meet up in a group but not any more with out them which I miss I feel that something not right bit odd and don't know how to aproach them about it because I want to know