M5 343 wheels with PS4S installed on 650iX GC

[socal28]

Finally got around to upgrading the OEM 19" wheels/tires with the F10 M5 343 20" wheels and Michelin Pilot Sport 4S tires.
The tires sizes I went with are F: 245/40-20 and R: 275/35-20.

Several reasons I went with these sizes.
1. Wanted a bit more sidewall for comfort and road rim protection.
2. Got a great deal on the 245/40-20 tires.
3. These sizes are OEM equipped on 7-series and new 6-series GT models. (There's got to be some assurance if BMW opts for these sizes.)
4. Speedo was off ~2 MPH slower with the original setup (compared to GPS Waze speedo). With taller diameter, the speedo is now about .5-1 mph faster. Yes, probably safer to read faster than actual though.
5. Felt that the 255/35-20 & 295/30-20 option were going to be a bit too wide for my liking.
6. Wanted to fill in the wheel/fender gap a bit without lowering springs. (Xdrive cars seems to have a larger gap than non Xdrives.)

Coming off the Goodyear LS2 Run-flats, these PS4's are great! More comfortable, quieter and definitely more grip.

As for fitment, the front setup is very tight. The inside center area of the wheel is very close to the caliper. I'm talking maybe only a mm at most of clearance. I hope there is no wheel deflection or caliper movements or rocks/debris gets stuck. The other concern is the inside suspension. Since I went with a taller tire, the gap between the inside mount is close as well.

The rear stance seems to stick out a bit more than I would want but ok. I think I would like to have it tucked in more about 5mm. Yes, these are from the M5 (+34 offset) and not M6 343 wheels.

So far, no issues after over 300 miles of driving.

There are significant weight savings going to these. (All done with the same bathroom scale and includes TMPS and wheels balance weights.)
OEM 19's with GYLS2 245/40-19 = 68.2 lbs
343 Fronts with PS4S 245/40-20 = 52.8 lbs
343 Rears with PS4S 275/35-20 = 58.0 lbs
This is over 50 lbs less of rotational weight savings!











BTW, the original M5 PZero tires that came with these wheels are for sale here:
http://f10.m5post.com/forums/showthread.php?t=1495977

[Tfzen]

Looks really nice, my dream wheels on the F06.

Do you feel anything regarding the loss of unsprung weight?

[Deda]

I need to tell you...you have zero protection for rims..so watch out from curbs..you cant inagine how easy is curb the rim..good luck.

[socal28]

Originally Posted by Tfzen

Looks really nice, my dream wheels on the F06.

Do you feel anything regarding the loss of unsprung weight?

Yeah, do notice the steering a bit lighter but that may be just the new tires too.

[socal28]

Originally Posted by Deda

I need to tell you...you have zero protection for rims..so watch out from curbs..you cant inagine how easy is curb the rim..good luck.

Yeah, I know. At least the rim is not further out than the tire.

[elvisisdog]

Properly interested in this. Was looking to do the same thing as wanted to fill the wheel well as well as give a bit more rim protection. I've got 373m on 640d. Was going to stick with stock after looking at the front suspension shock mount. Looks really close on standard setup and worn out tyres, anyone know if there is any difference in the shock mounts been 650 ix and 640d? I'm assuming there different based on the extra weight of the diesel lump.

Op any idea what the clearance is on your setup between shock mount and tyre?/

[socal28]

Originally Posted by elvisisdog

Op any idea what the clearance is on your setup between shock mount and tyre?/

Do you mean from the top of the tire to the suspension mount in picture 6?
I'm not sure probably about 5mm.

[Flying Ace]

wow! those are some razor thin clearances, especially on the caliper. I would go with a spacer just to be safe.

As regards to the suspension clearance with the top of the tire, I wouldn't feel comfortable with it either. I'm not 100% sure which suspension piece that elbow is, but it looks like it's designed to flex downward, though I can be wrong, it might flex laterally. I would go with OEM M tires if they don't rub just to be safe and buy that extra clearance.

[Flying Ace]

btw, did you measure the true width of the 343 wheels? I'm having an active debate with someone regarding the width of the wheel regarding its color (I know it sounds crazy)...

Further, I also heard the M5 343s have a different offset than the M6's. So non M owners should be looking for M5 343s, they're apparently not the exact same wheel.

[upstate650]

Originally Posted by Flying Ace

btw, did you measure the true width of the 343 wheels? I'm having an active debate with someone regarding the width of the wheel regarding its color (I know it sounds crazy)...

Further, I also heard the M5 343s have a different offset than the M6's. So non M owners should be looking for M5 343s, they're apparently not the exact same wheel.

M5 343 wheels are completely different widths and offsets than M6 343. M5 are 9" front and 10" rear, m6 are 9.5 and 10.5. Offsets are different, too.

[brad850csi]

Originally Posted by Flying Ace

btw, did you measure the true width of the 343 wheels? I'm having an active debate with someone regarding the width of the wheel regarding its color (I know it sounds crazy)...

Further, I also heard the M5 343s have a different offset than the M6's. So non M owners should be looking for M5 343s, they're apparently not the exact same wheel.

Ahh I know the answer here. The 343M came out in silver only first on the M5, then when the M6 came out the 343M in black became available for both cars.

At that time BMW did some silly copy paste and stuffed up the specs, then never fixed it!

All F10 M5 wheels including the 19" and 20" summer wheels are 9" 32mm and 10" 34mm.

All F06/12/13 wheels 19" and 20" summer wheels are 9.5" 31mm and 10.5" 19mm. It is that massive rear offset difference that means no M6 wheels will fit on other 6 series cars.

The reason for this is that hubface to hubface is 1725mm on the non-M F10 and F06/12/13 but is 1650mm on the M5 and M6. That is why the 343M M5 wheels look really aggressive on the non-M 6 series and why the M6 wheels with a 10.5" with and 19mm offset still fit on the M6.

All stock staggered 19" and 20" non-M 6 series wheels are 8.5" 33mm front and 9" 44mm rear.

The 343M wheels are forged, but the 601M aren't which is why everyone is talking about the 343M wheels, they are quite a bit lighter


I've actually bought a set of 343M wheels from an M5 for my M6 and my plan is to get the 20x10" on the front with a 12-15mm spacer which will let me run 275 or 285's on the front.

Then my 20x9 and 20x9.5" wheels will look great on a 535d F11 I'll buy for the misses

[1199s]

Have you noticed any problems with the tire set up as far as Traction light malfunctions or ABS lights? Any rubbing thus far?

I am thinking of using the same set up for my car. Looks awesome by the way.

[Chili Palmer]

Originally Posted by brad850csi

Ahh I know the answer here. The 343M came out in silver only first on the M5, then when the M6 came out the 343M in black became available for both cars.

At that time BMW did some silly copy paste and stuffed up the specs, then never fixed it!

All F10 M5 wheels including the 19" and 20" summer wheels are 9" 32mm and 10" 34mm.

All F06/12/13 wheels 19" and 20" summer wheels are 9.5" 31mm and 10.5" 19mm. It is that massive rear offset difference that means no M6 wheels will fit on other 6 series cars.

The reason for this is that hubface to hubface is 1725mm on the non-M F10 and F06/12/13 but is 1650mm on the M5 and M6. That is why the 343M M5 wheels look really aggressive on the non-M 6 series and why the M6 wheels with a 10.5" with and 19mm offset still fit on the M6.

All stock staggered 19" and 20" non-M 6 series wheels are 8.5" 33mm front and 9" 44mm rear.

The 343M wheels are forged, but the 601M aren't which is why everyone is talking about the 343M wheels, they are quite a bit lighter


I've actually bought a set of 343M wheels from an M5 for my M6 and my plan is to get the 20x10" on the front with a 12-15mm spacer which will let me run 275 or 285's on the front.

Then my 20x9 and 20x9.5" wheels will look great on a 535d F11 I'll buy for the misses

How is pushing the rims out going to allow you to put a wider tire on the front? It'll stick out past the fender. I'm running 255's on 343's on my 650 and the edge of the tread sits a little inside of the fender edge, I could probably step up to a 265 max. I'm running 285's in the rear, the rim and the bulge of the tire stick out slightly past the edge of the rear fender, but the tread is barely behind the fender edge. I'd love to run 295's, but I like the edge of the tire behind the edge of the fender.

[brad850csi]

Originally Posted by Chili Palmer

How is pushing the rims out going to allow you to put a wider tire on the front? It'll stick out past the fender. I'm running 255's on 343's on my 650 and the edge of the tread sits a little inside of the fender edge, I could probably step up to a 265 max. I'm running 285's in the rear, the rim and the bulge of the tire stick out slightly past the edge of the rear fender, but the tread is barely behind the fender edge. I'd love to run 295's, but I like the edge of the tire behind the edge of the fender.

The M6 has a different front fender design which sticks out quite a bit further than the 640/650.

[Chili Palmer]

Originally Posted by brad850csi

The M6 has a different front fender design which sticks out quite a bit further than the 640/650.

I failed to absorb the part that you have an M6, I thought you were putting the M5 wheels on a 650.

Carry on...

[jackliu0527]

Originally Posted by socal28

Do you mean from the top of the tire to the suspension mount in picture 6?
I'm not sure probably about 5mm.

so no rubbing issues at all with suspension or at full turn? I am thinking about running the increase side wall profile like you but is seriously worried about clearance

[gordonc]

First time user, unsure of etiquette of joining a thread with a slightly different question - so pls don't shoot ff topic:

I'm looking to put 20" M5 343m wheels (20X9 & 20X10) on a 2012 640i soft-top (RWD). The M5 wheels have 265 fronts and 295 rears. Upon some advice from Deda (thanks man) I'm changing out the 295s to 285s to prevent any rubbing on the 6er. My question is would I be ok keeping the 265s on the front (together with the new 285s on the rear) or do I risk rubbing on the front or a mis-match with the rear?? Im happy to change to 255s on the front in due course, but the existing 265s have plenty tread, so would rather wear them out first (I'm a Scotsman after all)!

Any advice greatly appreciated by this newbe!

Cheers

[Qsilver7]

Without knowing the aspect ratio (the middle tire size number)...no one can accurately run your numbers...so here's a link to a tire size calculator that can give you the answer as to if 265 front & 295 rear tires you are considering are within 3% (+/-) each other.

If they are greater than 3% (+/-)...then you can cause serious issues. Here's the link...use the TIRE SIZE tab and just input the actual tire size specs you're considering for the front...then compare it to the rear tire specs you want to use: https://www.1010tires.com/Tools/Tire-Size-Calculator

And again, the reason I'm suggesting going to the link is...the aspect ratio of the 265 & 295 tires you are looking at can greatly change if the tire will work or not...so not knowing this info and only going with 265 & 295 (front/rear) could be giving you incorrect information.

[gordonc]

Many thanks for the link. The outcome was -2.09%, so looks ok in terms of suitability. Any thoughts on whether front tyres will rub on the 640i - the tyre size is 265/35/R20.

Cheers

[Qsilver7]

Originally Posted by gordonc

Many thanks for the link. The outcome was -2.09%, so looks ok in terms of suitability. Any thoughts on whether front tyres will rub on the 640i - the tyre size is 265/35/R20.

Cheers

Don't shoot me...but I'm going to give you another "homework" assignment.

Go to this site: www.willtheyfit.com and compare the OE front wheel/tire combo to the new wheel/tire combo (you can do the rear, too...just for the info). This site will give you/show you the "poke" (outward toward the fender) & "inset" (inward toward the suspension). You can take that data and determine (measure) if you will have issues with either poke or inset.

[brad850csi]

I think you'll be fine with 265/35 at the front in regards to normal driving but the electronics might freak out a bit if you're pushing it, either in corners or in a straight line. I don't recall someone running a difference that big front to rear.

You might as well try it but make sure you've got a bit of cash spare to pony up for the extra tyres if you need them.

[gordonc]

Thanks for the advice both. I looked at WillThey Fit; result: "Compared to your existing wheel, this new wheel will have an inner rim which is 5.4mm closer to the suspension strut. The outer rim will poke out 7.4mm more than before".
These measurements don't "feel" excessive; will give it a go...

Thanks again