Tire Size Converter
Convert a metric tire code into diameter, width, sidewall height, circumference, and revolutions per mile, then compare it with a second setup.
Jeep Gearing Comparison
Compare estimated engine RPM for two tire-and-axle combinations at the same road speed and transmission ratio.
Crawl Ratio Calculator
Calculate overall low-range reduction from first gear, transfer-case low range, and axle ratio.
Speedometer Error Calculator
Estimate actual road speed after changing tire diameter without recalibrating the vehicle.
Jeep Model Code Identifier
Decode common Jeep and enthusiast model codes, then confirm parts by model year, body, trim, engine, transmission, and market.