Help! something changed on my rear wheels...

elzorro4 · 07-20-2015, 09:39 AM

Hi,

On saturday I changed the rear tyres, I replaced the original Bridgestone with Goodyear F1 Assymetric 2 RFT. Both have the same specs...

I also did alignment (front and rear) and balance the 4 wheels.

When I took the car to the highway I did the test I always do pushing the wheel hard from side to side (like the racing cars do when they want to heat up the tyres).
I was used to feel like the car was on a rail, rear tyres copied front tyres instantly. Now its seems like the rear suspension is softer...

I took the car to align again today but I feel the same...

Its like riding a Jetta, not a sporty 135i... Any thoughts?

Thanks!

Xyloft · 07-20-2015, 09:51 AM

Quote:

Originally Posted by elzorro4

Hi,

On saturday I changed the rear tyres, I replaced the original Bridgestone with Goodyear F1 Assymetric 2 RFT. Both have the same specs...

I also did alignment (front and rear) and balance the 4 wheels.

When I took the car to the highway I did the test I always do pushing the wheel hard from side to side (like the racing cars do when they want to heat up the tyres).
I was used to feel like the car was on a rail, rear tyres copied front tyres instantly. Now its seems like the rear suspension is softer...

I took the car to align again today but I feel the same...

Its like riding a Jetta, not a sporty 135i... Any thoughts?

Thanks!

how many miles?

elzorro4 · 07-20-2015, 09:55 AM

Quote:

Originally Posted by Xyloft

how many miles?

17k miles

NorthernDancer · 07-20-2015, 10:36 AM

Well super low miles so nothing should be broken or worn out.
Two things were changed, tires and alignment. Alignment checked twice so maybe issue is tires, even tho new. Do you know anyone with another set of tires mounted on rims, even snow tires that could be swapped in? Can you recover your old tires, mount them again? Do you know anyone else with a 1 series? Have them drive your car to see if there really is an issue. Check the side walls of the new tires very carefully looing for bumps, bulges or anything not normal. I'm thinking you have 1 bad tire (even tho brand new).

elzorro4 · 07-20-2015, 10:45 AM

Quote:

Originally Posted by NorthernDancer

Well super low miles so nothing should be broken or worn out.
Two things were changed, tires and alignment. Alignment checked twice so maybe issue is tires, even tho new. Do you know anyone with another set of tires mounted on rims, even snow tires that could be swapped in? Can you recover your old tires, mount them again? Do you know anyone else with a 1 series? Have them drive your car to see if there really is an issue. Check the side walls of the new tires very carefully looing for bumps, bulges or anything not normal. I'm thinking you have 1 bad tire (even tho brand new).

Before they mounted them I checked them and I didnt find anything wrong... I will check again or take tthe car to the dealer again to take the tyres off and check them on the inside... the year of fabrication of the tyres is 2014, they are new new.

Pissoff · 07-20-2015, 10:52 AM

Ok, different tires have different amounts of sidewall flex. Sounds like the new tires have more flex. Tires act as a spring too. What happened is with putting different tires on the rear you changed the spring rate. In this case to a softer one. By not having the front tires changed to the same ones those tires have a higher spring rate. If you want to see what I am talking about add 4 lbs. air to the rear tires to make them stiffer and take it out on the road. Really the only good answer is to put new front tires that match the rear now.

amsnow440 · 07-20-2015, 11:20 AM

Quote:

Originally Posted by Coleroad

Ok, different tires have different amounts of sidewall flex. Sounds like the new tires have more flex. Tires act as a spring too. What happened is with putting different tires on the rear you changed the spring rate. In this case to a softer one. By not having the front tires changed to the same ones those tires have a higher spring rate. If you want to see what I am talking about add 4 lbs. air to the rear tires to make them stiffer and take it out on the road. Really the only good answer is to put new front tires that match the rear now.

What Coleroad said and also this: "...As any autocrosser or racer who has tread rubber shaved off of his tires will tell you, low tread depth tires respond more quickly. Don't be surprised if your new tires are a little slower to respond (even if you use the exact same tire as before). Their new, full depth brings with it a little more tread squirm until they wear down...."

http://www.tirerack.com/tires/tirete...e.jsp?techid=5

Pissoff · 07-20-2015, 11:23 AM

Quote:

Originally Posted by amsnow440

What Coleroad said and also this: "...As any autocrosser or racer who has tread rubber shaved off of his tires will tell you, low tread depth tires respond more quickly. Don't be surprised if your new tires are a little slower to respond (even if you use the exact same tire as before). Their new, full depth brings with it a little more tread squirm until they wear down...."

http://www.tirerack.com/tires/tirete...e.jsp?techid=5

Yes a good point. Something else is tire places don't always put in the correct tire pressure either. Just like most tire installers don't know what the painted dot is there for on the sidewall.

NorthernDancer · 07-20-2015, 11:44 AM

Good points guys-and I missed the rear tires only part. I know what the painted dot represents.

MightyMouseTech · 07-20-2015, 11:45 AM

Um, have you checked your tire pressures?

MightyMouseTech · 07-20-2015, 11:46 AM

Quote:

Originally Posted by Coleroad

Yes a good point. Something else is tire places don't always put in the correct tire pressure either. Just like most tire installers don't know what the painted dot is there for on the sidewall.

Which one, there is a yellow dot and a red one, they mean different things.

KNS · 07-20-2015, 12:51 PM

New tires - normal. You've got a lot of tread squirm from all that new, fat tread and the mold release is still working its way off the tires.

That's why they tell you (should tell you) to take it easy the first 100 miles or so while they are breaking in.

elzorro4 · 07-20-2015, 01:19 PM

thanks for all of your comments. I have already done 200 miles... I will wait 200 more miles to make any conclusion... But if I could take a guess I would go for the tyre flex, not the fat tread, etc. Fat tread, etc, makes the tyre slippery, the feeling I get is more of a suspension feel, more likely to fix with a couple more lbs of pressure.

My current pressure is F: 39lbs, R: 45lbs

Thanks

dtla1 · 07-20-2015, 04:29 PM

45 lbs!? Cold? No. doesn't your sticker say 36F, 39R?

Esteban · 07-20-2015, 04:42 PM

Quote:

Originally Posted by dtla1

45 lbs!? Cold? No. doesn't your sticker say 36F, 39R?

That does sound high. Especially for runflats, which already have a stiffer sidewall.

07-20-2015, 09:39 AM	#1
elzorro4 Private First Class 20 Rep 116 Posts Drives: 135i Join Date: Oct 2014 Location: Argentina iTrader: (0)	Help! something changed on my rear wheels... Hi, On saturday I changed the rear tyres, I replaced the original Bridgestone with Goodyear F1 Assymetric 2 RFT. Both have the same specs... I also did alignment (front and rear) and balance the 4 wheels. When I took the car to the highway I did the test I always do pushing the wheel hard from side to side (like the racing cars do when they want to heat up the tyres). I was used to feel like the car was on a rail, rear tyres copied front tyres instantly. Now its seems like the rear suspension is softer... I took the car to align again today but I feel the same... Its like riding a Jetta, not a sporty 135i... Any thoughts? Thanks!
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07-20-2015, 10:36 AM	#4
NorthernDancer Colonel 848 Rep 2,276 Posts Drives: 08 Sedona 128 & 06 330xiT 6MT Join Date: Apr 2011 Location: Ottawa On Canada iTrader: (3)	Well super low miles so nothing should be broken or worn out. Two things were changed, tires and alignment. Alignment checked twice so maybe issue is tires, even tho new. Do you know anyone with another set of tires mounted on rims, even snow tires that could be swapped in? Can you recover your old tires, mount them again? Do you know anyone else with a 1 series? Have them drive your car to see if there really is an issue. Check the side walls of the new tires very carefully looing for bumps, bulges or anything not normal. I'm thinking you have 1 bad tire (even tho brand new).
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07-20-2015, 10:52 AM	#6
Pissoff Banned 55 Rep 206 Posts Drives: 08, 128i e88 Join Date: May 2015 Location: Fuck you iTrader: (1)	Ok, different tires have different amounts of sidewall flex. Sounds like the new tires have more flex. Tires act as a spring too. What happened is with putting different tires on the rear you changed the spring rate. In this case to a softer one. By not having the front tires changed to the same ones those tires have a higher spring rate. If you want to see what I am talking about add 4 lbs. air to the rear tires to make them stiffer and take it out on the road. Really the only good answer is to put new front tires that match the rear now.
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07-20-2015, 11:44 AM	#9
NorthernDancer Colonel 848 Rep 2,276 Posts Drives: 08 Sedona 128 & 06 330xiT 6MT Join Date: Apr 2011 Location: Ottawa On Canada iTrader: (3)	Good points guys-and I missed the rear tires only part. I know what the painted dot represents.
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07-20-2015, 11:45 AM	#10
MightyMouseTech Major General 4338 Rep 6,196 Posts Drives: 13 135i 6MT LeMans Blue MSport Join Date: Feb 2013 Location: Ottawa, Canada iTrader: (0)	Um, have you checked your tire pressures?
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07-20-2015, 12:51 PM	#12
KNS Lieutenant 137 Rep 439 Posts Drives: 128i and Porsche Join Date: Dec 2014 Location: Arizona iTrader: (0)	New tires - normal. You've got a lot of tread squirm from all that new, fat tread and the mold release is still working its way off the tires. That's why they tell you (should tell you) to take it easy the first 100 miles or so while they are breaking in.
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07-20-2015, 01:19 PM	#13
elzorro4 Private First Class 20 Rep 116 Posts Drives: 135i Join Date: Oct 2014 Location: Argentina iTrader: (0)	thanks for all of your comments. I have already done 200 miles... I will wait 200 more miles to make any conclusion... But if I could take a guess I would go for the tyre flex, not the fat tread, etc. Fat tread, etc, makes the tyre slippery, the feeling I get is more of a suspension feel, more likely to fix with a couple more lbs of pressure. My current pressure is F: 39lbs, R: 45lbs Thanks
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07-20-2015, 04:29 PM	#14
dtla1 Colonel 828 Rep 2,232 Posts Drives: 2011 135i, Space Grey Join Date: Apr 2014 Location: Silicon Valley iTrader: (2)	45 lbs!? Cold? No. doesn't your sticker say 36F, 39R?
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