|
|
|
03-06-2008, 02:22 AM | #1 |
PCA, BMWCCA
103
Rep 2,058
Posts |
18" Front Tire Size for 135i
Perhaps Gill or others can shed some light...
Seems 225/35/18 is a better option than the 225/40/18 for conventional rubber selection??? The OEM tires (front and rear) outer tire diameters are both 24.7". the 225/35 outer diameter is 24.2" and the 225/40 is 25.1". Both the 225/35 and 225/40 use wheel widths 7.5~9". Both 225/35 and 225/40 have 9" tire sections and 7.7" tread width. And the 225/35 usually weighs a pound+ less than the 225/40. In the case of the Goodyear Eagle F1 GS-D3 the 225/35 weighs 3 pounds less! Unless someone has a reason why you shouldn't use the 225/35 front, then it seems it's the best option when going to a 18x8 or 18x8.5 front wheel, or until better tires are offered for the 18x7.5 OEM fronts. Note: Schnitzer uses 225/40 all around on their wheel combos (18x8.5). My desire would be to have the same outer diameter tire front and rear, or a slightly smaller outer diameter front. But the 225/40 front with the OEM rear makes the outer diameter bigger on the front...which is what seems odd and the reason for the post.
__________________
'08 Carrera S 6MT Guards Red/Black ext leather, Carbon fiber pkg, sport exh, sport chrono +, PASM, Nav, Bose, 19" forged turbos, red tranny tunnel
'07 MV Agusta F4 1000 R 1+1, Corse Red/Silver, RG3 race pipes and factory race ECU |
03-06-2008, 06:57 AM | #2 |
No longer moderate
327
Rep 4,401
Posts |
Balls - I think revolutions per mile on the 225/35/18 are around 859 and on the stock rear around 840. I'm thinking along the same lines as you - going with a 225/35 front when the RFTs are worn slick.
|
Appreciate
0
|
03-06-2008, 09:47 AM | #3 |
Moderator
372
Rep 4,742
Posts |
I'm sure either way will work fine. It will end up being driver preference. I'm choosing 225/40/18 and 255/35/18 for a few reasons.
1. Much better tire selections than the standard sizes. 2. The overall diameter is a bit higher rather than lower. I don't want anything on there that increases the appearance of the fender gap. The smaller the OD of the tire the more this becomes relevant. 3. I personally value the wider rubber, front and rear, that this provides. It's a visual thing for me.
__________________
Gary. Tire and Wheel Forum Moderator. Tire Rack Sales Rep Gary@Tirerack.com
http://www.tirerack.com/a.jsp?a=AH8&url=index.jsp Please refer to 'Gary/E90 Post' as your previous contact when you order online to help support this forum. |
Appreciate
0
|
03-06-2008, 10:35 AM | #4 |
PCA, BMWCCA
103
Rep 2,058
Posts |
^^ That would work (25" OD rear vs. 25.1" OD front). However, the 255/35 is 2 pounds heavier than the 245/35 when using the same Goodyears as example.
__________________
'08 Carrera S 6MT Guards Red/Black ext leather, Carbon fiber pkg, sport exh, sport chrono +, PASM, Nav, Bose, 19" forged turbos, red tranny tunnel
'07 MV Agusta F4 1000 R 1+1, Corse Red/Silver, RG3 race pipes and factory race ECU |
Appreciate
0
|
03-16-2008, 04:51 PM | #6 |
Lieutenant
41
Rep 466
Posts |
|
Appreciate
0
|
03-17-2008, 02:18 AM | #7 | |
PCA, BMWCCA
103
Rep 2,058
Posts |
Quote:
I think the best solution is to use 225/40 all around, preferrably on 8" or 8.5" wide wheels for both F and R. And the 225/40 can be used on the OEM wheels all around too.
__________________
'08 Carrera S 6MT Guards Red/Black ext leather, Carbon fiber pkg, sport exh, sport chrono +, PASM, Nav, Bose, 19" forged turbos, red tranny tunnel
'07 MV Agusta F4 1000 R 1+1, Corse Red/Silver, RG3 race pipes and factory race ECU |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|