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AndyS 
Really Senior Member II
The Last of the Few
Joined: 21-August-2003
Location: 55 � North
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Points: 1365
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 Topic: Alloy / Wheel size
Posted: 10-October-2005 at 20:20 |
You should find you have a little less tramlining with the slightly narrower fronts.
Either way, enjoy your new found grip! 
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AndyS Live each day as if it's your last - one day it will be. 
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DAT 635
Advanced Newbie
Joined: 30-September-2005
Location: Tyne & Wear
Status: Offline
Points: 39
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Posted: 10-October-2005 at 16:58 |
Cheers Graham, I.ve just read through the posts again & I think it quite understandable for someone to get mixed up.
I am sure 235/45/17 & 255/40/17 are as near as damm it the same circumference. If you go to the millimeter I should have gone for 225/45/17 to the front, but because I was replacing 240 width tyres I went for the size closest.
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graham325isport
Really Senior Member I
Joined: 15-April-2003
Location: Sunderland . United Kingdom
Status: Offline
Points: 286
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Posted: 10-October-2005 at 15:23 |
Dave, I think your getting mixed up mate  Take it from your little brother your car has 235/45/17 front and 255/40/17 on the rear.You were right the first time.
I told you Andy would keep you right
Edited by graham325isport
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E60 M5 Silver Grey
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Horsetan
Really Senior Member II
Say Neigh to Gatsos
Joined: 11-April-2003
Location: Please let it be Ireland
Status: Offline
Points: 6381
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Posted: 09-October-2005 at 17:56 |
 AndyS wrote:
Well there you go then. |
Yup
*sigh*
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AndyS
Really Senior Member II
The Last of the Few
Joined: 21-August-2003
Location: 55 � North
Status: Offline
Points: 1365
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Posted: 09-October-2005 at 17:33 |
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Well there you go then.
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AndyS Live each day as if it's your last - one day it will be.
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Horsetan
Really Senior Member II
Say Neigh to Gatsos
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Posted: 09-October-2005 at 17:14 |
AndyS wrote:
....Were your TRX's the older 390 diameter? |
I asked. They weren't.
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AndyS
Really Senior Member II
The Last of the Few
Joined: 21-August-2003
Location: 55 � North
Status: Offline
Points: 1365
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Posted: 09-October-2005 at 14:21 |
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You want the rolling circumference to be as close as possible to the original which was 1982.6mm (240/45x415 TRX).
A 255/40 rolling circumference is 1997.7 so is + 0.8% compared to the original.
A 255/35 rolling circumference is 1917.6 so is - 3.4% compared to the original.
These are "ideal world" sizes as tyres from different manufactures can differ slightly.
Were your TRX's the older 390 diameter?
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AndyS Live each day as if it's your last - one day it will be.
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DAT 635
Advanced Newbie
Joined: 30-September-2005
Location: Tyne & Wear
Status: Offline
Points: 39
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Posted: 08-October-2005 at 16:37 |
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40 profile on a 235 is OK but 40 on a 255 is larger than what was on.
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AndyS
Really Senior Member II
The Last of the Few
Joined: 21-August-2003
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Posted: 08-October-2005 at 13:11 |
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The rears are too low a profile, they should be 255/40.
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AndyS Live each day as if it's your last - one day it will be.
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DAT 635
Advanced Newbie
Joined: 30-September-2005
Location: Tyne & Wear
Status: Offline
Points: 39
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Posted: 08-October-2005 at 07:03 |
Sossy my mistake, I have 235/40/17 to the front & 255/35/17 on the rear which are as close as you can get to the circumference of what was on.
By the way I have four as new standard wheels with brand new Michelin metrics if anyone is interested.
On a seperate note I have found a supplier in Germany who has plenty of BMW part mudflaps.
www.wallothnesch.com
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AndyS
Really Senior Member II
The Last of the Few
Joined: 21-August-2003
Location: 55 � North
Status: Offline
Points: 1365
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Posted: 06-October-2005 at 17:07 |
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Taken from the diff I believe.
255/40 x 17 have the same rolling circumference as the 240/45 x 415
TRX's so I've kept one as a spare. Don't know the implications of
having two different sized tyres on the rear with a lsd but I'd rather
not find out.
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AndyS Live each day as if it's your last - one day it will be.
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Jimbob
Bavarian-Board Contributor
Joined: 27-July-2005
Location: Live: West Sussex - Work: Islington
Status: Offline
Points: 190
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Posted: 06-October-2005 at 16:59 |
AndyS wrote:
A slightly nose down stance is preferable to slightly nose up if you want to keep high speed stability. |
For looks as well, IMO. Its important to keep close to the original total hight for the speedo etc - but is that front or back?
Edited by Jimbob
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And so says Jimbob.
1981 635csi 81k miles. Will be fixed, but not by me.
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AndyS
Really Senior Member II
The Last of the Few
Joined: 21-August-2003
Location: 55 � North
Status: Offline
Points: 1365
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Posted: 06-October-2005 at 16:53 |
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235/45 x 17 has a taller sidewall height than a 255/40 x 17, that's why
I fitted 235/40's at the front & 255/40 x 17 at the rear.
A slightly nose down stance is preferable to slightly nose up if you want to keep high speed stability.
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AndyS Live each day as if it's your last - one day it will be.
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DAT 635
Advanced Newbie
Joined: 30-September-2005
Location: Tyne & Wear
Status: Offline
Points: 39
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Posted: 06-October-2005 at 16:44 |
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My six had 240/45/ 415 all round & Ive just fitted 235/45/17 to the front & 255/40/17 to the rear & are having no problems at all.
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caley64
Groupie
Joined: 28-June-2005
Location: Highlands
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Points: 95
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Posted: 06-October-2005 at 01:49 |
I've got Alpinas on my M6. 8" x 16" on the back and 7" x 16" on the front (8" were too wide for the front) Still got the original wheels and 4 almost new TRX's for originality purposes.
I also have another two 16" x 8" Alpinas, brand new with centre caps, if anyone is looking.
Steve.
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Horsetan
Really Senior Member II
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Location: Please let it be Ireland
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Posted: 05-October-2005 at 16:39 |
timausten wrote:
Does anyone know if, 255/40/17 will fit my 6 ?
X2 255/40/17
X2 235/45/17
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You are a glutton for punishment, so!
235/45/17 will fit
255/40/17 may give you rubbing issues in front.....
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timausten
Newbie
Joined: 17-August-2005
Location: Kent
Status: Offline
Points: 33
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Posted: 05-October-2005 at 16:37 |
Does anyone know if, 255/40/17 will fit my 6 ?
X2 255/40/17
X2 235/45/17
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Horsetan
Really Senior Member II
Say Neigh to Gatsos
Joined: 11-April-2003
Location: Please let it be Ireland
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Posted: 22-September-2005 at 19:13 |
timausten wrote:
You do know your wheels ! |
No comment
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timausten
Newbie
Joined: 17-August-2005
Location: Kent
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Posted: 22-September-2005 at 15:39 |
You do know your wheels ! But question sorted now I think, found some info on the web.
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Horsetan
Really Senior Member II
Say Neigh to Gatsos
Joined: 11-April-2003
Location: Please let it be Ireland
Status: Offline
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Posted: 22-September-2005 at 11:13 |
timausten wrote:
....does anyone know if the following would fit on my M635 1987 - ET24 16"x8" with 225/40 on the front and 245/45 on the rear would there be any clearance problems etc ? |
Are you not allowed a test fit? 8x16 sounds like an Alpina alloy....
Edited by Horsetan
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Alloy / Wheel size
