Drag Race Gear Ratio Calculator, Rear End Gear Needed Speed from RPM & Gear Ratio Calculate 1/4 to 1/8th mile ET Calculate 1/8th to 1/4 mile ET Altitude Density & Dew Point Temperature You may also be interested in these helpful tools. Calculate Rear End Gear Ratio needed. Also solve for RPM, Tire Size and MPH. But determining the ideal ratio can be a daunting task, especially for novice racers. Example: If your max HP is at 6300 RPM use 6300 for the RPM. The Motive Gear drag performance calculator helps determine the best axle ratio for any drag vehicle to achieve the desired quarter or eighth-mile performance. Includes weather corrections and atmospheric calculations. Input your transmission ratios, rear gear ratio, tire size, and target RPM to calculate exact vehicle speed. Then, change Richmond's performance gear ratios and beat your best time! Access Drag Performance Calculator This calculator will help your hot rod or street machine get to the next level without red-lining your engine. Drag Performance Calculator By AssassinRacing. km, sqd8, nlcw, mhxy4a, gzpp, pxbzryk, dh7i, 1tzt, qr, kk,