Thanks for the info

Surely if you had a matching set tho that wouldn't make a difference, mine aren't original tyres but are all the same tyre

No there not original tyres but after research they are the right sizes which i find strange when everyone mentions tyres are so important on the xdrive models for the same rolling road circumference, having 45 on the front and 40 on the back means the tyres are smaller on the back straight away so ...

I've read alot about people mentioning tyres, do you think my problem is mine I've noticed that I've got 225/45r18 with 6.5mm on the front and 255/40r18 with 4.5mm on the back

Thanks i will do, just haven't got a clue people mention tyres being different depths having an impact on the diff and it playing catch up and I don't mind spending the money on new ones if its gonna fix it my tyres I've got now have 6.5 mm on the front and 4.5 mm on the back but don't fancy paying ...

Yeh its a manual it only happens when your coming to a stop and in 1st or 2nd gear, it feels as if the abs has kicked in for s split second but there's no lights that flag up on the dash board

It feels like the front oh its a 2012 m sport model e84, it feels as if you've banged it into gear but the gearbox feels completely normal no slip or stiff gear changes, its very smooth

Hi I've got an x1 xdrive and when coming to a stop there's a thud just before it stops, now it doesn't do it all the time seems to when doing a long journey. It only does it when coming to a stop in 1st or 2nd gear, hope someone can help i have no idea. The car drives great no clutch issues gears ...