Terms of Use & Disclaimer

1. Purpose & Scope

WrenchRig provides free online automotive calculators and reference tools covering areas including but not limited to:

• Tire sizing, speedometer correction, and wheel fitment
• Fuel economy, fuel cost, and cost-per-mile estimation
• Drivetrain calculations (gear ratios, RPM, final drive)
• Engine displacement and performance calculations
• Torque unit conversions
• Coolant mixture ratios and fluid specifications
• Shop and repair reference tools

Our tools reference industry-standard formulas and data from sources including SAE International standards, NIST conversion factors, ASTM specifications (e.g., ASTM D3306 for coolant), tire industry standards (TRA/ETRTO sizing conventions), and IRS published mileage rates. These tools provide general estimates that may not account for manufacturer-specific variations, production tolerances, or vehicle-specific conditions.

2. No Professional Advice

Nothing on WrenchRig constitutes professional automotive engineering, mechanical, or safety advice. Our calculators do not replace:

• Licensed automotive engineers or mechanics
• Vehicle manufacturer specifications, TSBs, or service manuals
• Professional tire fitting and alignment services
• Torque specifications from the fastener or vehicle manufacturer
• In-person vehicle inspection and measurement
• State vehicle safety inspection requirements

If you are performing safety-critical work - including but not limited to brake service, suspension modifications, wheel and tire changes, engine rebuilds, or drivetrain modifications - always consult the vehicle manufacturer's service manual and/or a qualified professional mechanic.

3. Limitation of Liability

WrenchRig, its owners, operators, and contributors shall not be held liable for any damages, losses, injuries, or mechanical failures arising from the use of any calculator, tool, or information provided on this website. This includes but is not limited to:

• Incorrectly sized tires causing speedometer inaccuracy, rubbing, or handling issues
• Wheel offset or backspacing calculations resulting in improper fitment
• Gear ratio or RPM calculations leading to improper drivetrain configuration
• Torque values applied incorrectly resulting in fastener failure
• Engine displacement calculations used for incorrect parts ordering
• Coolant mixture ratios resulting in freeze or boilover damage
• Fuel cost or mileage estimates used for financial decisions
• Any property damage, personal injury, vehicle damage, or consequential damages

You assume all risk associated with the use of our calculators and any mechanical work performed based on their output. By using this site, you acknowledge that online calculators are inherently limited and that real-world results depend on factors no calculator can fully account for.

4. Accuracy & Verification Practices

We take accuracy seriously. Our approach includes:

• Formula verification - All calculations are audited against published engineering references, SAE standards, and NIST conversion factors
• Cross-referencing - Results are checked against known real-world values (e.g., known engine displacements, standard tire dimensions)
• Automated testing - Our calculators are tested weekly with known inputs and expected outputs to catch regressions
• Ongoing updates - We update reference data (such as IRS mileage rates) as new figures are published

Despite these practices, no calculator is infallible. Manufacturing tolerances, rounding differences, and real-world variables mean actual results may differ from calculated estimates. If you believe you've found an error in any of our tools, please contact us at hello@wrenchrig.com - we take error reports seriously and will investigate promptly.

5. Real-World Variations

Automotive specifications vary significantly based on factors our calculators cannot fully account for, including:

• Tire dimensions: Actual tire sizes vary by manufacturer, tread design, inflation pressure, and wear - published sizes are nominal
• Fuel economy: Real-world MPG depends on driving conditions, vehicle maintenance, load, weather, terrain, and driver behavior
• Torque specifications: Required torque values vary by fastener grade, thread lubricant, material, and application - always use the vehicle/fastener manufacturer's published spec
• Coolant specifications: Freeze and boilover points depend on coolant brand, concentration accuracy, altitude, and cooling system condition
• Vehicle-specific factors: Model year differences, factory options, aftermarket modifications, and wear can all affect calculations

Always verify with your specific vehicle's documentation and take physical measurements where safety is concerned.

6. Affiliate Links & Advertising

WrenchRig participates in the Amazon Services LLC Associates Program, an affiliate advertising program. When you click product links on our site and make a purchase, we may earn a commission at no additional cost to you.

In accordance with FTC guidelines:

• Product recommendations are based on relevance to the tool's subject matter and user reviews
• Affiliate relationships do not influence our calculation results in any way
• We may also display advertisements through Google AdSense

We only recommend products that are genuinely relevant to the automotive work our tools support.

7. Privacy & Data

Your privacy matters to us:

• All calculations run entirely in your browser. No calculation inputs or results are transmitted to our servers or stored anywhere.
• We use Google Analytics and Google AdSense, which may use cookies to collect anonymous usage data and serve relevant ads. These services are governed by Google's Privacy Policy.
• No personally identifiable calculation data is ever stored, logged, or shared.

8. Intellectual Property

All content on WrenchRig - including calculator code, page designs, text, graphics, and the WrenchRig name and logo - is the intellectual property of WrenchRig and is protected by copyright law.

The underlying mathematical formulas used in our calculators are derived from publicly available engineering standards and are not proprietary. Our specific implementation, presentation, and original content are protected.

You may not reproduce, redistribute, or create derivative works from our content without written permission.

9. Changes to These Terms

We may update these terms at any time. Changes take effect immediately upon posting. The "Last updated" date at the top of this page reflects the most recent revision. Continued use of WrenchRig after changes constitutes acceptance of the updated terms.

10. Contact

If you have questions about these terms, spot an error in a calculator, or need to reach us for any reason:

• Email: hello@wrenchrig.com