Project Autocross BRZ: Dodging Cones With GT Radial

by Bart Hockerman

“Who is GT Radial?”

That was the 1st words out of everyone's mouth when reading the SCCA Solo Contingency Program page. 

What seemed to be a more known name on the West Coast was virtually unknown throughout the rest of the country. The next big question is “What tire do they have that we will want to use?”

Doing some quick Google-Fu research provided some of the info we were looking for. The big find was the actual tire that would have the potential for competition use for us, the Champiro SX2.

“An extreme performance tire developed for enthusiasts who want higher levels of traction, response, and driving control in dry and wet conditions.”

Based on this find alone someone was going to have to put the tires to the test and see what they are all about. With this in mind MotoIQ was able to source a set of the new Champiro SX2 tires in the 245-40-17 for Project Autocross BRZ.

200 treadwear GT Radial Champiro SX2 advertised features.
The tires arrived directly from GT Radial US as most tires do, in two stacks of two tires taped together with some great looking GT Radial tape.

Upon delivery and inspection of the tires you will notice that the mold for the tread pattern they used is similar to that of the RE-11 tire offered by Bridgestone. However the asymmetrical design used on the GT Radial uses the larger tread block on the inside of the tire vs the outside. Another standout feature is the step center tread molding to try to curb tread squirm/flex under high load cornering. While these features hold some promise the Champiro SX2 has some stiff competition for the 2015 autocross season. 

GT Radial selfie on the way to get the Champiro SX2’s mounted up. Hauling stuff is the perfect job for a Honda CRV ( I am told it must be a midwestern thing).
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Friday, July 17, 2015 5:11 AM
Yay for CR-V love! I once crammed four full sets of 13" SAE wheels and tires in the back of my old CR-V. Must be a Midwest and East Coast thing.

Also this article has complicated my tire choice. I was going to look at a set of Nitto NT-05's for my 240SX, but these are now on my radar. Decisions, decisions...
Friday, July 17, 2015 9:06 AM

Give them serious consideration. They have been a Great all around summer tire option that wears really well and are super predictable.
Friday, July 17, 2015 11:55 AM
Any feedback on the sidewall stiffness and steering response with these? Unless I missed it I didn't see that mentioned in the article..
Friday, July 17, 2015 12:29 PM
@BBRTuning The overall sidewall stiffness is pretty good, not near as stiff as a Bridgestone RE-11, but very similar to that of the Dunlop ZII.
As for the turn in /steering response with the GT Radials on my setup it was smooth yet crisp however it can be different between cars, suspension setups and alignments.
Saturday, July 18, 2015 11:33 AM
Wet traction looks very impressive in the video. Nice work too driving.
Saturday, July 18, 2015 2:46 PM
NT05 is not that great 8695.

Nick do you think the 3rd place finish would have stuck if they didn't call the event for rain?
Nick B
Nick Blink
Tuesday, July 21, 2015 11:23 AM
@Supercharged - I'm not the writer/owner of the vehicle. I just posted it to the site for Bart (2Superblus), I'll make him aware of your question...
Tuesday, July 21, 2015 11:28 AM
@Supercharged111- I think the tires in the wet are very good an I think I could have been in the top 3 in the wet had we had they not called the afternoon heats. The other drivers in the top spots were on brand new RE-71R's (rumor had it they are the ultimate wet tire when new).
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