Please help - Losing back end

[Mattb89]

I keep loosing the back end of my c5 around roundabouts not speeding I don't have a clue why does anyone have an idea thanks

[zollaf]

what make of tyres are fitted ?

[anorak_ian]

At the risk of sounding stupid,, check your wheel nuts. Inspect the tyres for damage.
Jack up and spin, pull and push the wheel, take the wheel off do the same with the disc, calliper and everything you can get your hands on.
Use the correct tyre pressure & direction of rotation.
Suspension maybe something to look at also.

[Mattb89]

I have mid range tyres fitted I take it that could possibly affect it ?

[zollaf]

mid range, means nowt, go look, what does it say, goodyear, pirelli, avon, or something more sinister like 'event', mayweather, dimgrip etc...

[anorak_ian]

No, I have used some total junk tyres and my car has never had this problem.

[Mattb89]

Ok thanks for help , do you think 20mm spacers would be causing this ?

[anorak_ian]

Trial and error, take them off and if the problem goes away, then you have it.

[Rob69]

Worn out dampers ( shock absorbers) ?

[fishybusiness]

Remove spacers, go back to post no 3, do all checks see what you find.