DrivetrainPro - Support

About DrivetrainPro

DrivetrainPro is an iOS app designed to help cyclists calculate precise gear ratios for optimal bike performance. Whether you're a casual rider, competitive cyclist, or bike mechanic, our app provides accurate calculations for any drivetrain configuration.

How to Use the App

Basic Setup

1. Wheel Size: Select your wheel size (700C, 26", 27.5", 29", etc.)

2. Tire Size: Enter your tire width in millimeters

3. Crank Length: Set your crank arm length (typically 170mm, 172.5mm, or 175mm)

4. Gear Units: Choose your preferred measurement (Gain Ratios, Gear Inches, Development)

Drivetrain Configuration

1. Chainring Setup: Select 1x, 2x, or 3x configuration

2. Enter Chainring Teeth: Input the number of teeth for each chainring

3. Cassette Type: Choose stock cassette or enter custom sprocket teeth

4. Calculate: Tap the Calculate button to generate your gear ratio table

Frequently Asked Questions

Q: What's the difference between Gain Ratios and Gear Inches? A: Gain Ratios show mechanical advantage considering crank length, while Gear Inches is a traditional measurement showing equivalent wheel diameter.

Q: Can I use custom cassette configurations? A: Yes! You can enter custom sprocket teeth counts for any cassette configuration.

Q: Which wheel size should I select? A: Choose the size that matches your bike's wheels (700C for road bikes, 26"/27.5"/29" for mountain bikes).

Q: Why do I need to enter tire size? A: Tire width affects overall wheel diameter, which impacts the accuracy of gear ratio calculations.

Troubleshooting

App crashes or freezes:

• Force close the app and restart

• Ensure you have the latest iOS version

• Restart your device if problems persist

Calculation results seem incorrect:

• Verify all input values (wheel size, tire size, crank length)

• Check that chainring and cassette teeth counts are correct

• Ensure you've selected the right gear units

Missing cassette options:

• Use the custom sprocket option to enter your specific cassette teeth

• Contact support if you need help with tooth counts

Contact Support

Email: pierreriehl@outlook.com

When contacting support, please include:

• Your iOS version

• App version

• Description of the issue

• Screenshots if applicable

Response Time: I typically respond within 48 hours

Feature Requests

feel free to send me your suggestions for new features or cassette options you'd like to see added.