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Mechanic & Rider Calculators

Motorcycle Workshop Tools & Engineering Calculators

Interactive mathematical simulators, fluid sumps, and electrical diagnostic decoders engineered for professional motorcycle technicians and home DIY mechanics.

Chassis & Wheel Fitment

Motorcycle Tire Size & Cold Pressure Finder

Look up verified OEM motorcycle front and rear tire sizes, rim diameters, and cold inflation pressure specifications (PSI) across sportbikes, cruisers, and ADV machines.

✓ OEM Front & Rear Dimensions✓ Cold PSI Solo & Two-Up✓ Direct Tire Catalog Links
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Interactive Multimeter Diagnostics

Motorcycle 3-Phase Charging System Diagnostic Bench

Interactive multimeter test workbench. Enter real-time voltage and resistance readings to isolate burnt stator windings, blown rectifier diodes, and weak batteries.

✓ Battery Load Drop & Running VDC✓ 3-Phase Stator AC Voltage & Balance✓ Coil Resistance & Ground Isolation✓ Rectifier Diode Bridge Analysis
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Workshop Calibration

Motorcycle Engine Oil Capacity & Viscosity Finder

Instantly look up factory sump capacities with/without filter, recommended JASO MA2 viscosities, and drain plug torques for 122+ modern motorcycles.

✓ Filter Change Volume (L & Qt)✓ Recommended Viscosity (10W-40, 20W-50)✓ Drain Plug Torque & Crush Specs
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Interactive Simulator

Motorcycle Gearing, Sprocket & Chain Calculator

Calculate top speed per gear, final drive ratios, 520 chain conversion rotating mass, and speedometer error offsets across OEM sportbike, cruiser, and ADV platforms.

✓ RPM-to-Speed Curve Matrix✓ 520 Conversion Weight Delta✓ Swingarm Axle Displacement
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Motocross & Enduro Fuel Math

2-Stroke Fuel Pre-Mix Ratio & Oil Volume Calculator

Calculate exact 2-stroke premix oil volumes in fluid ounces (fl oz), milliliters (mL/cc), and pints across 24:1, 32:1, 40:1, 50:1, and 60:1 ratios for gallons or liters.

✓ 24:1 to 100:1 Ratio Matrix✓ U.S. Gallons & Metric Liters✓ Fluid Ounces & mL / cc Readouts
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V-Twin Powertrain Service

Harley-Davidson 3-Hole Oil Capacity & Viscosity Calculator

Calculate exact fluid capacities and recommended viscosities for all 3 separate holes: Engine Sump, Primary Chaincase, and 6-Speed Transmission for Milwaukee-Eight, Twin Cam, and Evo.

✓ Engine Sump (20W-50), Primary & Trans✓ OEM 11105 Viton O-Rings & Torques✓ Direct Consumables Shopping Manifest
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Chassis & Spring Calibration

Motorcycle Suspension Spring Rate & Rider Sag Calculator

Calculate recommended front fork and rear shock spring rates (N/mm, kg/mm, lbs/in) calibrated to geared rider mass, passenger weight, linkage leverage ratio, and riding discipline.

✓ Geared Weight Sliders (lbs & kg)✓ Fork N/mm & Shock lbs/in Outputs✓ Static Sag Sanity Check Matrix
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Cockpit Ergonomics & Controls

Motorcycle Handlebar Riser & Cable Extension Calculator

Calculate required extended clutch cable lengths (+2", +4", +6", +8"), front upper brake lines, and CAN-Bus switch wiring extensions when installing risers, T-Bars, or ape hangers.

✓ Riser & Bar Rise Vector Math✓ ABS Upper Brake Line Requirements✓ CAN-Bus & TBW Wiring Extensions
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Electrical Diagnostics

Diagnostic Fault Code & DTC Decoder Engine

Decode 105+ verified OBD2 and OEM trouble codes for Harley-Davidson, Yamaha, Suzuki, Kawasaki, and Honda with multimeter bench testing steps.

✓ Multimeter Ohm Resistance Specs✓ Dashboard MIL / FI Light Decoders✓ Pinout Testing Steps
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Safety Verification

NHTSA Powersports Safety Recalls Directory

Search official U.S. National Highway Traffic Safety Administration defect campaigns, hazardous safety consequences, and authorized free dealer remedies.

✓ Campaign Number Lookup✓ Defect Hazard Analysis✓ Free Dealer Remedy Actions
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Statutory Reference

50-State Motorcycle Helmet & Eye Protection Laws Guide

Complete legal breakdown of universal vs partial helmet laws, medical insurance age exemptions, and mandatory eye protection statutes across all 50 states.

✓ Universal vs Age-Restricted States✓ Mandatory Eye Protection Statutes✓ DOT vs ECE 22.06 Standards
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