PSS replacing RFT's

Breaking1 · 01-14-2015, 05:54 PM

I have conflicting recommendations from service providers about replacing the RFT's on a 2013 M-sport 135i with the PSS. fronts are 215/40R18 and the rears are 245/35R18.

for example, I hear the following "advice":
1. will "push" when turning - What does that mean, more effort on my part turning the wheel ? (this place is pushing the RFT's)
2. will need toe-in adjustment, and BMW needs to do the alignment or there will be excessive front tire wear - Is this true? (this place won't do an alignment on a BMW)
I've read many post on this and don't recall needing a toe-in after replacing the RFT with PSS. Do I need to do this?

Thanks!

hau_nguyen91 · 01-14-2015, 06:53 PM

Quote:

Originally Posted by Breaking1

I have conflicting recommendations from service providers about replacing the RFT's on a 2013 M-sport 135i with the PSS. fronts are 215/40R18 and the rears are 245/35R18.

for example, I hear the following "advice":
1. will "push" when turning - What does that mean, more effort on my part turning the wheel ? (this place is pushing the RFT's)
2. will need toe-in adjustment, and BMW needs to do the alignment or there will be excessive front tire wear - Is this true? (this place won't do an alignment on a BMW)
I've read many post on this and don't recall needing a toe-in after replacing the RFT with PSS. Do I need to do this?

Thanks!

I just replaced my RF with PSS last week for 15K miles

Stock size replacement as well

The dealer check the alignment and said everything is green which the alignment is fine . I'm guessing that really depend if you been driving hard and hitting potholes

Breaking1 · 01-14-2015, 09:15 PM

Hau_nguyen91,

Thanks -
Did you have your tires replaced at the dealer?

hau_nguyen91 · 01-15-2015, 08:21 AM

Quote:

Originally Posted by Breaking1

Hau_nguyen91,

Thanks -
Did you have your tires replaced at the dealer?

I got my tires replaced at Lexus because my friend work there and does all the balancing

The alignment was done at BMW

I don't think BMW replaced tires from other place

JimD · 01-15-2015, 11:01 AM

I replaced my RFT with PSS about 10K miles ago. I did not do an alignment. Unless you see uneven wear on the tires you are removing, I see no reason to do an alignment. I put the same size tires as came on the back all the way around - fronts too. I did that for rotation purposes but also to reduce understeer in the front.

When people talk about pushing they are often talking about understeer. PSS have more grip than RFT so the limits increase due to the tire change. I don't see why people would talk about them understeering. The point at which the car will do that with PSS tires is a higher cornering load than with the original tires. BMWs are set up to understeer but that isn't a tire issue.

Breaking1 · 01-15-2015, 10:52 PM

thanks for the advice guys!

litebulb · 01-16-2015, 03:08 AM

Quote:

Originally Posted by JimD

I replaced my RFT with PSS about 10K miles ago. I did not do an alignment. Unless you see uneven wear on the tires you are removing, I see no reason to do an alignment. I put the same size tires as came on the back all the way around - fronts too. I did that for rotation purposes but also to reduce understeer in the front.

When people talk about pushing they are often talking about understeer. PSS have more grip than RFT so the limits increase due to the tire change. I don't see why people would talk about them understeering. The point at which the car will do that with PSS tires is a higher cornering load than with the original tires. BMWs are set up to understeer but that isn't a tire issue.

Hi could you please post more details of your setup? Are you using PSS 245 on the stock 7.5JX18 ET47 front 261M or 8.5JX18 ET52 and did you have to do a fender roll to fit that much rubber?

Thanks

Freon · 01-16-2015, 10:19 AM

Replacing wheels and tires doesn't really change your alignment. Toe, camber, and caster are not affected.

If you change your offset it can affect how the car handles, and in the front it will change your scrub radius which affects how the car steers, but that's nothing an alignment job can change back to factory.

Getting an alignment is a good idea periodically regardless, so if it has been a while this may be a convenient time. Any time you notice uneven wear you should have it checked.

Dackelone · 01-16-2015, 10:54 AM

IF your car tracks straight now and doesn't pull(change direction) while under hard accel or braking) and your steering wheel points straight while on the highway... you will be fine with just tires. But all that said... its always a good idea to check your alignment every year or two. Especially when spending $$$ on new tires. Don't want them all chewed up 6K miles later.

Breaking1 · 01-16-2015, 08:10 PM

Will have the alignment checked after replacing the RFT's -had an alignment done about 750 mi ago with oil service as it was out of align and there was some outside wear on the fronts. It since tracks straight and the steering wheel points straight on the highway, and we have decent roads around here, so hopefully I'll be all set. Thanks everyone for the input!

01-14-2015, 05:54 PM	#1
Breaking1 New Member 0 Rep 11 Posts Drives: 2013 135i MSport Join Date: May 2014 Location: Raleigh, NC iTrader: (0)	PSS replacing RFT's - Do I need to have alignment work at BMW? I have conflicting recommendations from service providers about replacing the RFT's on a 2013 M-sport 135i with the PSS. fronts are 215/40R18 and the rears are 245/35R18. for example, I hear the following "advice": 1. will "push" when turning - What does that mean, more effort on my part turning the wheel ? (this place is pushing the RFT's) 2. will need toe-in adjustment, and BMW needs to do the alignment or there will be excessive front tire wear - Is this true? (this place won't do an alignment on a BMW) I've read many post on this and don't recall needing a toe-in after replacing the RFT with PSS. Do I need to do this? Thanks!
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01-14-2015, 09:15 PM	#3
Breaking1 New Member 0 Rep 11 Posts Drives: 2013 135i MSport Join Date: May 2014 Location: Raleigh, NC iTrader: (0)	Hau_nguyen91, Thanks - Did you have your tires replaced at the dealer?
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01-15-2015, 11:01 AM	#5
JimD Brigadier General 368 Rep 3,547 Posts Drives: 128i convertible Join Date: Apr 2009 Location: Lexington, SC iTrader: (0)	I replaced my RFT with PSS about 10K miles ago. I did not do an alignment. Unless you see uneven wear on the tires you are removing, I see no reason to do an alignment. I put the same size tires as came on the back all the way around - fronts too. I did that for rotation purposes but also to reduce understeer in the front. When people talk about pushing they are often talking about understeer. PSS have more grip than RFT so the limits increase due to the tire change. I don't see why people would talk about them understeering. The point at which the car will do that with PSS tires is a higher cornering load than with the original tires. BMWs are set up to understeer but that isn't a tire issue. __________________ 128i Convertible, MT, Alpine White, Black Top, Taupe Leatherette, Walnut, Sport Ordered 5/22/09, Completed 6/4/09, At Port 6/9/09, On the Georgia Highway 6/13/09, Ship Arrived Charleston 6/24/09 at 10pm, PCD 7/21/09
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01-15-2015, 10:52 PM	#6
Breaking1 New Member 0 Rep 11 Posts Drives: 2013 135i MSport Join Date: May 2014 Location: Raleigh, NC iTrader: (0)	thanks for the advice guys!
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01-16-2015, 10:19 AM	#8
Freon Major 81 Rep 1,051 Posts Drives: 2009 135i Join Date: Nov 2007 Location: Indianapolis iTrader: (3)	Replacing wheels and tires doesn't really change your alignment. Toe, camber, and caster are not affected. If you change your offset it can affect how the car handles, and in the front it will change your scrub radius which affects how the car steers, but that's nothing an alignment job can change back to factory. Getting an alignment is a good idea periodically regardless, so if it has been a while this may be a convenient time. Any time you notice uneven wear you should have it checked. __________________ 2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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01-16-2015, 10:54 AM	#9
Dackelone European Editor 10539 Rep 22,992 Posts Drives: N54 e82 Join Date: Feb 2010 Location: Bayern, Germany iTrader: (1)	IF your car tracks straight now and doesn't pull(change direction) while under hard accel or braking) and your steering wheel points straight while on the highway... you will be fine with just tires. But all that said... its always a good idea to check your alignment every year or two. Especially when spending $$$ on new tires. Don't want them all chewed up 6K miles later. __________________ Dackel's European Delivery Museum Guide
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01-16-2015, 08:10 PM	#10
Breaking1 New Member 0 Rep 11 Posts Drives: 2013 135i MSport Join Date: May 2014 Location: Raleigh, NC iTrader: (0)	Will have the alignment checked after replacing the RFT's -had an alignment done about 750 mi ago with oil service as it was out of align and there was some outside wear on the fronts. It since tracks straight and the steering wheel points straight on the highway, and we have decent roads around here, so hopefully I'll be all set. Thanks everyone for the input!
	Appreciate 0 Quote