. FirestoneRacing satisfied with gap between alternates and primaries in IndyCar, and the performance of the new guayule-derived 'green' tires
Firestone announced in the offseason that for all street courses this year, the softer alternates would be constructed with a sidewall made from the sustainable guayule desert shrub. These green sidewalled tires made their debut at last year’s race in Nashville, and have been brought onboard for all five of the temporary tracks on the 2023 IndyCar schedule.
“When we went to do our compound metrics that we send out to the race teams we noted that there would be a little more wear than what we’ve had in the past at St. Pete, just in the compound, nothing to do with the guayule that goes into the sidewall. “Romain Grosjean did a phenomenal job getting to run 28 green-flag laps on the alternates, but if you overuse them, if you put too much steering into them, too much braking into them, they’re not going to last quite as well. So whether it’s an alternate tire at a road or street course or an oval tire where we’re hoping to have a lot of degradation to help provide some racing strategic options, they really reward a good driving style –not over-slip them, not lock them up.
“We’ve seen it’s difficult to create passing opportunities at Gateway, and we came up with a plan and presented it to IndyCar,” said Krstolic. “We’ve been talking to the race teams about this for a couple of years.
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