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X drive and Michelin Pilot Super Sports
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07-01-2014, 12:12 AM | #23 |
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Just did some calculations....
225/40/18: 78.812" circumference; 25.086" Diameter 235/40/18: 79.801" circumference; 25.401" Diameter 265/35/18: 79.492" circumference ; 25.303" Diameter 275/35/18: 80.35" circumference; 25.57" Diameter 235/40 & 265/35 seems to be a closer match than 235 & 275 as the former is closer and also sets up the front a hair bigger in diameter than the rear. |
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07-01-2014, 06:51 AM | #24 |
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235/40 265/35 should work good.
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07-01-2014, 10:24 AM | #25 |
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1. 235/40/18 and 265/35/18
2. 235/40/18 and 275/35/18 were recommend for me. I was also told I could go 275 in the back but it's more of a tight fit. OEM I had staggered setup (225/40/18 and 255/35/18) which give -0.24% difference or 2 rev per mile difference. OEM : -0.24% and 2 rev per mile Setup 1 : -0.39% or 4 rev per mile Setup 2 : 0.70% or -5 rev per mile I was recommended Setup 1 because of the smaller rolling diameter between the 2 and the fact we stay in the negative rolling diameter like the stock tire setup. I am currently waiting on my tire for Setup 1. In 19 would be the same sizing except tire height which IIRC are -5 over 18. (235/35/19 and 265/30/19).
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07-01-2014, 11:06 AM | #26 | |
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Makes perfect sense. This should be stickied in the xi section. |
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07-07-2014, 09:17 PM | #27 | |
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07-07-2014, 09:29 PM | #28 |
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So my last thoughts are that the construction of the PSS with its twaron fibers makes the tires act differently than normal, and that the measured rim width could cause a difference.
With the 225/35R19 and 265/30R19 they have measured rim widths of 8" and 9.5" respectively. I mounted them on style 313 wheels which are 8" and 9" respectively. So maybe since the stretch was different from front to rear it changed the rolling diameters disproportionately. Does anyone have any experience or thoughts on measured rim width differences with the wheel causing diameter changes? |
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07-08-2014, 05:47 PM | #29 |
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I found exactly what i need!
I need a shop with this specific equipment... http://www.hunter.com/balancer/quickmatch/features.cfm Check out the tranzsaver feature. |
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08-12-2014, 10:32 AM | #30 |
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*Bump*
For the same reasons as the OP I purchased a set of 225/35/19 and 265/30/19 tires as it was supposed to be one of the closest setups within the 1% diameter spec. TireRack also said this was the recommended setup and size over others. I wanted to see what the outcome was - were you able to use this setup when you put it on the Hunter machine with "transaver" or did you get a new setup? The vehicle also at times feels like it is slightly slipping during slow shifts or a slight jerk and I am concerned it is the tire size. It is not very noticeable but does give me a slight concern.
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08-12-2014, 09:06 PM | #31 | |
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08-12-2014, 09:11 PM | #32 |
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Well 225/35/19 and 265/30/19 is well within the 1% threshold... yet it gave the OP problems and appears to be giving me problems as well. Its hard to believe that everyone says that if you are less than 1% there is no issue but yet there is. I don't think I will deviate from stock sizes again.
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08-13-2014, 08:31 AM | #33 |
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Great discussion here and some good info. I'm kind of curious why so many of you are die hard to run the Michelin PSS. The construction of each tire brand varies, and sidewall structure can have different effects on the transfer case.
Over the past 5 years, I have successfully run the common staggered widths with no issues, none of them with Michelins. 225/40 (18) and 255/35 (18) Bridgestones, and toyos 235/35 (19) and 265/30 (19) Hankooks, Toyos, and Vredestein 235/35 and 275/30 (Toyo Proxes) 225/35 and 255/30 (Toyo Proxes) I have different wheel setups for different reasons. Don't be so quick to trust the vendors and/or tire manufacturers. Finding out the hard way is an expensive cost. The Hunter machine with transaver will show you some pretty interesting things with the Michelin PSS. A few of the audi guys have had issues with quattro due to some misleading info.
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08-13-2014, 09:54 AM | #34 | |
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there are a number of factors that can come into play, and i have my doubts that it can be caused by tire sizes. people have been running the standard 235/35 265/30 and 275/30 for years without any single issue whatsoever.
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08-13-2014, 09:58 AM | #35 | |
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08-13-2014, 06:48 PM | #36 |
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offtopic: how much did you get them for? I'm considering the same.
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08-13-2014, 06:51 PM | #37 |
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08-13-2014, 09:47 PM | #38 | |
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08-13-2014, 09:55 PM | #39 | |
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As I explained the fronts should be the same diameter or larger by 1% when compared with the reara. The fronts should not be smaller diameter by any amount. I have similar problems as the op with my 225/40 265/35 18 inch setup which is actually a bigger difference than his setup. Not sure why he lost a clutch actuator and I haven't but there are a lot of variables to consider and it could just be luck of the draw. Basically stick with square setups or fronts that are the or greater in diameter by 1% when compared to the rears. |
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08-14-2014, 08:10 AM | #40 |
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For what it is worth, this is my summer setup on Michelin Pilot Sports and I have no drive-ability issues. I have only run this setup this summer so can't weigh in on long term. I like them a lot, great handling and the best gas mileage I have had with the car. 21.3 mpg combined at 36 psi all around.
VMR 713 Hypersilver Wheels 8.5x19 ET35 with 235/35ZR19 Michellin Pilot Sports, 9.5x19 ET33 with 265/30ZR19 Michellin Pilot Sports, OEM TPMS |
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08-14-2014, 10:09 AM | #41 | |
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08-14-2014, 12:07 PM | #42 | |||
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08-14-2014, 12:40 PM | #43 |
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Probably differences in tire construction. You are also running narrower rims than most of us with 19s which does have an effect on the overall diameter. Another thing I notice is that you don't really drive your car.... I think the longer you drive it, in a variety of conditions, the more likely this will cause a problem.
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08-14-2014, 08:24 PM | #44 | |
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Logically I would think that going off of the revs per mile that TireRack posts would give you an accurate indication of how close you are front to back...unless the numbers are incorrect of course. Even with the differences in tire construction if it's softer/harder it would impact both the front and rear tires and be net neutral, right? I could definitely be wrong, but that's the way I'm thinking about it. (This assumes you're not doing anything crazy with PSIs and you're not fitting a 275 with tire on a 7" wheel paired with a 215 tire on a 10" wheel.) You're correct that I do not put a lot of miles on my car, but it seems from reading posts on this forum that people have issues right away when they put on a staggered tire/wheel setup that the transfer case doesn't like rather than seeing issues after 10k, 20k 30k miles down the road. To me, it seems like some transfer cases are very sensitive to staggered setups and some are not. This guy has been driving for over 60k with a 1.3% difference with no issues. His front tires are much smaller than his rear tires too. Although I do really like the theory about how the TC works and ideally running a larger tire up front.
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335xi, michelin, pss, transfer case, xdrive |
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