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      06-11-2012, 02:48 PM   #1
Merked M3
First Lieutenant
 
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Drives: E90 M3 6MT
Join Date: Apr 2011
Location: Sunnyvale, CA

Posts: 356
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To shave my used RA1s or not to shave.....

In preparation for my track day at Laguna Seca on June 30th, I am getting my tires setup. For the past year of track and autocross I have ran shaved 275/35/18 RA1s in the front and full tread 305/35/18 in the back. The setup has been amazing and I was unable to push the tires to their limit at the track. Although I do often push the tires to their limit and beyond at autocross.

So I recently chorded the shaved fronts and am getting pretty low in the back. The backs seem to be a bit more slippery than I remember, but I may have also been pushing them harder than normal at the last autocross. So I picked up a set of fronts that have tread, and now I have 4 unshaven tires. To enhance front grip and refresh the rears life I was thinking about shaving all 4 tires for Laguna Seca. So I was just wondering everyone's thoughts and was also looking for anyone who has experience with full tread RA1s vs shaved. I worry about grip in the front and have contemplated trying 285/30/18s possibly.
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2008 E90 M3 6-MT - Sold but not forgotten - amazing car

The next car, my Porsche Cayman S
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