changed to bigger rims - what is the purpose of 'offset'

[aidiyanz]

Hi all,good day..my ride is E46 Msport japan spec. Stock condition is using 17" rims, tyre size 225 45 17 front and 245 40 17 rear wheel. Recently I've changed to 18" rims. However, I read through internet forum stated that something called 'offset' should be install once bigger rims has put in. What is this so called 'offset'? What is the function? The mechanic at tyre shop not mentioned anything about this to me at all. If this 'offset' has not been installed, what is the consequences?I'm really glad if those otai here can share something about this.cheers...

 

[jarance]

the offset is in the rim. If the offset is not correct, your tyres may just scratch the wheel arc.

 

[aidiyanz]

thanx jarance..is it the offset is come together with the rims or it has to be buy separately..
based on my observation, it might scratch the wheel arch coz gap between it is just 1 finger width. Is it because offset has not installed..sorry for the silly question.

cheers

 

[jarance]

The offset is inherent with the rim. It cannot be changed. i.e. the offset are fixed.

Do a google search on wheel offset or rims offset to understand.

what type of 18" rims did you fixed for your ride. My E46 M Sport is also on 18" (F-225 / R-245) without much problem.

 

[bmw7833]

Offset is a term for rim measurement, bro.

 

[fabianyee]

the rim offset determined how deep is the rim's position in the wheel well or stick out of the body... different rims have different offset to cater to different cars.

 

[B33mEr]

The offset is inherent with the rim. It cannot be changed. i.e. the offset are fixed.

Do a google search on wheel offset or rims offset to understand.

what type of 18" rims did you fixed for your ride. My E46 M Sport is also on 18" (F-225 / R-245) without much problem.

Bro shouldn't it be rear 255/35/18 for M-Sport?

 

[aidiyanz]

will do some research about it later..
mine also same size..so no worry lah... thanx bro..

 

[aidiyanz]

B33mer..
255 so big lor for rear wheel...can fixed ar? some mechanic advised limit only to 245 for 3 series, for 5 series can go up 265.. I just say ok coz I dont know..so your ride put 255 right..itu olang sudah kenceng lor...

 

[jarance]

Bro shouldn't it be rear 255/35/18 for M-Sport?

Maybe.. not sure. ha..ha.. this show I take care of my car.. LOL..

front I am sure is 225 cos got it change last month.. :listen:

 

[jarance]

aiyo.. check the picture also cannot see the tyres size.

 

[jarance]

OK just check the actual tyres.

Its 265/35/ZR18..

 

[B33mEr]

B33mer..
255 so big lor for rear wheel...can fixed ar? some mechanic advised limit only to 245 for 3 series, for 5 series can go up 265.. I just say ok coz I dont know..so your ride put 255 right..itu olang sudah kenceng lor...

That's the size fitted to my wheels from bmw factory ... F:225/40/18 R:255/35/18 ... Of course i'm talking strictly about 325 and 330 M-Sport models it may vary for other M-Sport models e.g 318,320 and etc.

 

[B33mEr]

OK just check the actual tyres.

Its 265/35/ZR18..

Diameter Difference of 1.11% compared to the 255/35/18 ... Still within the 3% limit
So it's all good bro :top: