Bumpy

[Camgriff]

Have a 2010 X1 Deisel,  recently I have noticed that every now and then it feels like I am going over bumps, doesn't happen all the time.

[Greydog]

Morning Cameron

Welcome to the Forum

A bit more information would help us make a guess at what is happening

Which X1 model do you have Front wheel drive or X drive? What condition are the tyres and are they all the same make? When the bumby ride happens is it on the straight or in bends does it vary with speed? Does it happen under acceleration?

Dave

[Camgriff]

53 minutes ago, Greydog said:

Morning Cameron

Welcome to the Forum

A bit more information would help us make a guess at what is happening

Which X1 model do you have Front wheel drive or X drive? What condition are the tyres and are they all the same make? When the bumby ride happens is it on the straight or in bends does it vary with speed? Does it happen under acceleration?

Dave

Hi,

It's an X Drive, recently had 2 new rear tyres, have had them checked. Front tyres are the same. Happens when goingbin straight line. Happens when just driving along, intermittently. 

[Camgriff]

41 minutes ago, Camgriff said:

Hi,

It's an X Drive, recently had 2 new rear tyres, have had them checked. Front tyres are the same. Happens when goingbin straight line. Happens when just driving along, intermittently. 

 

41 minutes ago, Camgriff said:

Hi,

It's an X Drive, recently had 2 new rear tyres, have had them checked. Front tyres are the same. Happens when goingbin straight line. Happens when just driving along, intermittently. 

Just took it out to see if I could pinpoint problem.

It seems to happen at low speed eg when in slow traffic, then I go to accelerate in 2nd say, it feels a little bumpy but stops when build up speed.

[Greydog]

Hi Cameron

From your description and the additional information it sounds like transmission wind up, probable cause is the rear tyres being new have a larger rolling radius than the front that is putting strain on the transfer case and also the diffs. I would check them carefully tyres are much cheaper than a new Diff or Transfer Case

Dave

[Camgriff]

20 hours ago, Greydog said:

Hi Cameron

From your description and the additional information it sounds like transmission wind up, probable cause is the rear tyres being new have a larger rolling radius than the front that is putting strain on the transfer case and also the diffs. I would check them carefully tyres are much cheaper than a new Diff or Transfer Case

Dave

Hi many thanks, not knowing anything about cars, just checked and I have 255's on rear and 225's on front , is this correct.

[Greydog]

Hi Cameron

That sounds wrong for an X! to me unless the rear wheels are wider than the front

If your wheels are 17" tyre size should be 225x50x17 94H front and rear 18" Wheels tyres should be 225x45x18 or if wider rims at the rear 255x40x18 at the back 19" rims tyres should be 225x40x19" front 255x35x19" rear

As I have said check very carefully if the rear tyres are 255 but should be 225 then the distance they cover each rotation will be to much of a difference between front and rear and will cause damage

Dave

[Camgriff]

30 minutes ago, Greydog said:

Hi Cameron

That sounds wrong for an X! to me unless the rear wheels are wider than the front

If your wheels are 17" tyre size should be 225x50x17 94H front and rear 18" Wheels tyres should be 225x45x18 or if wider rims at the rear 255x40x18 at the back 19" rims tyres should be 225x40x19" front 255x35x19" rear

As I have said check very carefully if the rear tyres are 255 but should be 225 then the distance they cover each rotation will be to much of a difference between front and rear and will cause damage

Dave

Just checked again and rear (new) are 255 and front are 225

[Greydog]

But What size front are 225x?x? rear the same 255x?x? 

If wheels are 17" they should be 7.5J rims 18" 8.0J rims 19" should be 8.0J all round or if wider rears then 8j front and 9j rear 

The ONLY wheel set that has wider rear rims is 19" so if your car has 17" or 18" wheels the tyres are probably wrong just checking the width does not make them correct

Dave