Different front/rear tyre patterns

throttle · 12-18-2013, 05:43 AM

I'm about to change out the tyres on my 135i.
I'm thinking Kumho Ecsta KU31 in the front and Ecsta KU39 at the back due to stock availability. Will there be any issues as they are of different models and tread patterns?

Thanks

flinchy · 12-18-2013, 06:27 AM

as long as left to right is the same, and front to back it's not a HUGE tread/grip difference... you'll just notice oversteer or understeer a little more potentially.

Stuart@BMRAutowerkes · 12-18-2013, 04:49 PM

on a high performance tyre the difference is hardly noticeable, on a mediocre tyre like Kumhos difference less so again.

timbo_3101 · 12-18-2013, 06:03 PM

At a recent event, an E92 M3 driver was running front PSS and rear PSC (!).
I vaguely recall him commenting on understeer; but overall he was not driving aggressively (Phillip Island).

1BimmerNut · 12-18-2013, 08:16 PM

I run rear PSS's and front OE runcraps - no issue. I like the turn-in of the runcraps

choppedliver · 12-18-2013, 08:24 PM

I run pzeros on the front and PSS on the back. Only difference is the PSSs are miles better than the pzeros on the rear.

John_01 · 12-18-2013, 10:21 PM

I guess the problem may be related to the unusual tire size of the 135i. If it was my car, I would increase the front tire size to 225/40/18 which is a more popular size (Although it will lift the car by 4mm at the front).

Many people upgrade to 225/40/18 front and 255/35/18 rears which keeps the same sidewall height front and rear.

12-18-2013, 05:43 AM	#1
throttle Enlisted Member 14 Rep 38 Posts Drives: Join Date: Jan 2009 iTrader: (0)	Different front/rear tyre patterns I'm about to change out the tyres on my 135i. I'm thinking Kumho Ecsta KU31 in the front and Ecsta KU39 at the back due to stock availability. Will there be any issues as they are of different models and tread patterns? Thanks
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12-18-2013, 06:27 AM	#2
flinchy Brigadier General 126 Rep 3,099 Posts Drives: E82 135i Join Date: Nov 2011 Location: QLD, Australia iTrader: (0)	as long as left to right is the same, and front to back it's not a HUGE tread/grip difference... you'll just notice oversteer or understeer a little more potentially.
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12-18-2013, 04:49 PM	#3
Stuart@BMRAutowerkes Major General 808 Rep 5,530 Posts Drives: a black car Join Date: Sep 2010 Location: Sydney iTrader: (3)	on a high performance tyre the difference is hardly noticeable, on a mediocre tyre like Kumhos difference less so again.
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12-18-2013, 06:03 PM	#4
timbo_3101 Lieutenant 18 Rep 442 Posts Drives: Slow Join Date: Dec 2010 Location: Melbourne iTrader: (0)	At a recent event, an E92 M3 driver was running front PSS and rear PSC (!). I vaguely recall him commenting on understeer; but overall he was not driving aggressively (Phillip Island).
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12-18-2013, 08:16 PM	#5
1BimmerNut Private First Class 16 Rep 176 Posts Drives: 135i then 130i now F20-125 Join Date: Sep 2012 Location: Sydney, Australia iTrader: (0)	I run rear PSS's and front OE runcraps - no issue. I like the turn-in of the runcraps
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12-18-2013, 08:24 PM	#6
choppedliver Captain 160 Rep 758 Posts Drives: 2020 M550ix Pure Join Date: Nov 2011 Location: Australia iTrader: (1)	I run pzeros on the front and PSS on the back. Only difference is the PSSs are miles better than the pzeros on the rear.
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12-18-2013, 10:21 PM	#7
John_01 Colonel 232 Rep 2,643 Posts Drives: E90 325i, E82 135i Join Date: Mar 2009 Location: Sydney, Australia iTrader: (0)	I guess the problem may be related to the unusual tire size of the 135i. If it was my car, I would increase the front tire size to 225/40/18 which is a more popular size (Although it will lift the car by 4mm at the front). Many people upgrade to 225/40/18 front and 255/35/18 rears which keeps the same sidewall height front and rear.
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