"19 inch wheels to 18 inch my experience"
- Thread starter z4mroadster
- Start date
Steve_R1979
Member
z4mroadster said:
Aren't the standard sizes 225/40 and 255/35???
I know they are the sizes I generally find when I google it and taken from another thread:
in my manual etc that the appropriate tyres for 18" wheels on mine should be...
Front - 225/40 18
Rear - 255/35 18
Having said that, my car is running the sizes given by the OP.....can anyone clarify this?
Very nice OP, you may have seen in other threads I have been considering the move back down to 18s from the CSLs. It will be the ARC8s or EC-7 I go with. The only challenge I am having is knowing if the ARC8s in the exact size you have bought would clear my AP racing brakes.
Any chance I could ask a cheeky favour and get you to check clearance if I sent you a template?
Any chance I could ask a cheeky favour and get you to check clearance if I sent you a template?
OP..... only thing is i kinda think you've boo boo'd on the tyre size choice, for both tyres will have a slight stretch to them and the rims won't have any protection, i think you should have gone 235/40 and 265/35 respectively, you May find that 40 aspect ratio in the rear on an ET22 offset catches the fender lip/liner.... take the car on the fast bumpy b-road that gives full compression and report back.....
Beedub said:DONDP said:
they won't fit as are but with a 5 mm spacer they will
Hmmm, think I would need some more neg camber if I ran that offset with my current setup. Other option would be to raise ride height I guess...
I run my CSLs and oem 224s with a 5mm spacer and only just avoid rubbing when using track biased rubber (235/40 18). Effective offset on that setup is et37 so was hoping the et38s would be a straight fit :-(
Getting pushed towards the EC7s again with the ET35 setup
Going round in circles in my head with this one...
yeah the lower the offset the more camber needed, i run a -et29 up front, you should see my front wheels!!! lmao!! serious camber, but my ride height is very conservative, higher than the stock damper/eibach lowering spring combo id say... works very well for my aggressively setup vehicle.
z4mroadster
Member
Of course, ill even message the guy at baan velgen and the agent at apex I spoke to and ask them, I know for certain the ec-7 wheels have more clearence for definite.DONDP said:
z4mroadster
Member
Hey, ive just checked my owners manual and checked with a few internet sources and they confirm , fronts 18,45,225 and rears 18,40,255. But im sure there are multiple varients that can be used.Steve_R1979 said:
z4mroadster
Member
Thanks, the wheels set me back 1200 quid including, mounting, balancing and shipping direct to my door step.took 7 days.obviously thats without the tyers. Lolwilbo said:
z4mroadster
Member
Hey, i havent noticed any issues yet and ive been hit some fast country roads at some enthusiastic speed......but I will monitour what you have said.i did check with apex and baan first before I confirmed my order, and they said it would be fine.apparentley apex wheels are some of the most compatible wheels you can buy for the z4mr with plenty of clearence. Also a rep at sytner said the z4mr comes with two general offset choices which they cater for with the tyer spec ive got, front 41 and 42 and rear 20 and 30, but obviously this can be modified down to personal preference.thanks for the info mate.Beedub said:
z4mroadster
Member
Apex state the 18 inch apex wheels will clear up to 380mm bbk's on many applications.DONDP said:
not sure if this helps mate.
z4mroadster
Member
Hey, yes you can use the bmw centre caps, baan sent some free with the wheels but I forgot to put them in due to impatience in getting the wheels on.gwatson said:
the original wheel nuts fit also.ill be putting the bmw caps in over the weekend as im putting some new locking nuts in with the m logo on. Poncy I know.lolz4mroadster said:
Thats buddy, I just keep getting different information. I am sure the barrel is large enough as I can get my OEM 18s over them. Just concerned the spokes may foul them depending on the offset.
The fitment guide from AP can be downloaded from here : http://www.apracing.com/Drawings/P16230.pdf
It is a wheel off affair to check fitment but would really appreciate it. If your near to me and you don't mind i can even pop over with the necessary equipment to check.
Just added up that I could save 13.8kg by fitting the following wheels
APEX-EC7 8.5 ET38
APEX-EC7 9.5 ET35
The ARC-8's with the same width\offset would save 17.78kg!!
That's a significant weight saving, plus the fact it's unsprung weight too!
Please post more pictures once you get the centre caps in this weekend
APEX-EC7 8.5 ET38
APEX-EC7 9.5 ET35
The ARC-8's with the same width\offset would save 17.78kg!!
That's a significant weight saving, plus the fact it's unsprung weight too!
Please post more pictures once you get the centre caps in this weekend
z4mroadster
Member
gwatson said:Just added up that I could save 13.8kg by fitting the following wheels
APEX-EC7 8.5 ET38
APEX-EC7 9.5 ET35
The ARC-8's with the same width\offset would save 17.78kg!!
That's a significant weight saving, plus the fact it's unsprung weight too!
Please post more pictures once you get the centre caps in this weekend
I will do as soon as there on, those weight savings are huge ,17.7kg is a significant reduction in weight when it comes to performance,and according to the unsprung weight calculation that would be a saving of around 234lbs inside the car, that's like losing an extra passenger!!!
