Mixing tires on the track

uberschnell · 03-20-2008, 10:36 PM

Any thoughts on running different brand tires on the front and back on the track?

S4to335 · 03-21-2008, 02:29 AM

If you are in a 12 or 24 hour endurance race..the most important thing is to keep going..so in a pinch you can throw on what you got. But for you and the 335, I would not do this...X on front..and Y on rear.

leftcoastman · 03-21-2008, 11:38 PM

I've done it - because I corded a single tire. I was running race rubber and put on street rubber up front. Replaced both front tires.

If you HAVE to do it, put the less sticky stuff up front, because understeering is far preferable to unpredictable oversteer.

My lap times went down about 1.5 seconds and while it wasn't ideal in any way, it was a good learning experience. Being back on street rubber is humbling because your mistakes are not masked by the r-comp grip. The fronts, brand new before the weekend, were nearly toast after two days. The rears were barely worn.

Not ideal but works in a pinch.

Chowbow · 03-22-2008, 05:37 AM

My friend ran an AWD TT at the autoX with R comps up front and street tires in the rear. It made for an interesting run...

ZBMW · 03-22-2008, 10:23 AM

Tried that once. Put the old track tires on the rear and the new ones on the front. Hit a cold spot on the track and the rear end danced while the fronts held tight. The results were most unhappy. Should have had the softies in front.

leftcoastman · 03-22-2008, 02:49 PM

Quote:

Originally Posted by ZBMW

Tried that once. Put the old track tires on the rear and the new ones on the front. Hit a cold spot on the track and the rear end danced while the fronts held tight. The results were most unhappy. Should have had the softies in front.

Yeah no joke. That's why I put the less sticky stuff up front. If I'm going to start dancing around, I'd rather understeer than have my tail lights try to become my headlights.

uberschnell · 03-22-2008, 11:58 PM

Well, my question centers around the fact that I run 245 on all 4 corners. I've cupped a couple of my hankooks but have 2 good one's left. I wanted to try out another brand, street tires also, and around the same UTQ. I just wanted to rotate the new tires in the back and run the good hankooks up front till they're done, then go same brand on all 4. Just trying to find a way to not have to toss out 2 good tires.

03-20-2008, 10:36 PM	#1
uberschnell Brigadier General 680 Rep 4,077 Posts Drives: Wide Body 1 Join Date: Mar 2007 Location: Bay Area iTrader: (48)	Mixing tires on the track Any thoughts on running different brand tires on the front and back on the track?
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03-21-2008, 02:29 AM	#2
S4to335 Brigadier General 460 Rep 4,380 Posts Drives: 2014 Audi A4 / 91 Track Miata Join Date: Jan 2007 Location: San Jose, CA iTrader: (5) Garage List 2007 BMW 335i sedan [8.00]	If you are in a 12 or 24 hour endurance race..the most important thing is to keep going..so in a pinch you can throw on what you got. But for you and the 335, I would not do this...X on front..and Y on rear. __________________ Car is now gone .... :-(
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03-21-2008, 11:38 PM	#3
leftcoastman Lieutenant Colonel 55 Rep 1,714 Posts Drives: 335i Join Date: Jan 2007 Location: Near some canyons iTrader: (1)	I've done it - because I corded a single tire. I was running race rubber and put on street rubber up front. Replaced both front tires. If you HAVE to do it, put the less sticky stuff up front, because understeering is far preferable to unpredictable oversteer. My lap times went down about 1.5 seconds and while it wasn't ideal in any way, it was a good learning experience. Being back on street rubber is humbling because your mistakes are not masked by the r-comp grip. The fronts, brand new before the weekend, were nearly toast after two days. The rears were barely worn. Not ideal but works in a pinch.
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03-22-2008, 05:37 AM	#4
Chowbow pew pew 169 Rep 6,781 Posts Drives: 三三五i Join Date: Aug 2007 Location: CA iTrader: (6) Garage List 2015 BMW 328i wagon [0.00] 2007 BMW 335i sedan [10.00] 1997 BMW 328i track ... [10.00]	My friend ran an AWD TT at the autoX with R comps up front and street tires in the rear. It made for an interesting run... __________________ CSL replicas are now CSL counterfeits. Jesus saves, like Valentine1.
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03-22-2008, 10:23 AM	#5
ZBMW Black Forest Bimmerphile 2 Rep 137 Posts Drives: 2007 335i Join Date: Jan 2007 Location: Colorado iTrader: (1)	Tried that once. Put the old track tires on the rear and the new ones on the front. Hit a cold spot on the track and the rear end danced while the fronts held tight. The results were most unhappy. Should have had the softies in front.
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03-22-2008, 11:58 PM	#7
uberschnell Brigadier General 680 Rep 4,077 Posts Drives: Wide Body 1 Join Date: Mar 2007 Location: Bay Area iTrader: (48)	Well, my question centers around the fact that I run 245 on all 4 corners. I've cupped a couple of my hankooks but have 2 good one's left. I wanted to try out another brand, street tires also, and around the same UTQ. I just wanted to rotate the new tires in the back and run the good hankooks up front till they're done, then go same brand on all 4. Just trying to find a way to not have to toss out 2 good tires.
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