IPA’s Tire Comparator (Type II) helps save fuel and increase tire life to reduce costs, company officials said. The Tire Comparator is a fast and consistent caliper for comparing tire diameter on dual-mated tires, according to the company.  The Tire Comparator provides an easy method of ensuring mated tires are within tolerance. To use, hold the sliding tolerance gauge against the tire, and slide across the treads for a quick pass/fail result.