SpringSpec
Spring Rate Calculator
$9.99 · Designed for iPad. Not verified for macOS.
Spring rate, wheel frequency, calculated in seconds for your exact car. Matched to real springs from Eibach and Hyperco. By race engineers, for race engineers.
SpringSpec is a specialist spring rate calculator for motorsport suspension, built by race engineers for race engineers.
Enter your corner weights, unsprung mass, and motion ratio — SpringSpec calculates wheel frequency, wheel rate, critical damping, and static deflection across every standard spring rate. It then recommends Soft, Recommended, and Hard options based on your intended use and drivetrain layout, and matches you to real parts from the Eibach ERS and Hyperco catalogues.
KEY FEATURES
— Dual-axle calculator with frequency, wheel rate, damping and deflection for every common spring rate
— Drivetrain-aware balance: front-engine RWD, mid/rear-engine RWD, FWD
— Target presets from Road to Race (1.3 Hz to 2.2 Hz) plus custom entry
— Motion ratio entered as a decimal, squared internally — the correct engineering convention
— Colour-coded frequency bands (Road, Road/Track, Race, Too Hard)
— Built-in catalogue lookup for Eibach ERS and Hyperco springs, filtered by rate, free length, ID, and travel
— Motion Ratio Guide with clear diagrams and two measurement methods
— Save customer jobs locally with full inputs, results, and notes
— Works in lbs/in, N/mm, or kg/mm
NO ACCOUNTS. NO CLOUD. NO ADS. NO SUBSCRIPTIONS.
All your data stays on your device. One-off purchase, updates via the App Store.
DISCLAIMER
SpringSpec provides engineering guidance based on the data you enter. Always verify inputs and outputs independently. Suspension setup affects vehicle safety — verify all choices against manufacturer specifications and, where appropriate, a qualified motorsport engineer.
Published by RaceTracs Ltd, United Kingdom.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
NEW — Dual Rate Calculator
Model two springs in series (main + tender/helper) and see exactly how the stack behaves on the car. Supports both coil-bind and lockout-collar setups. Enter your spring rates, free lengths, block heights, corner weight and motion ratio, and SpringSpec calculates the combined rate, the rate at ride height, where the crossover happens and what the rate becomes after it, installed lengths, remaining travel, preload effects, and your workable ride-height window — with clear warnings when a combination won't work (springs going loose, coil bind inside the stroke, helper needed). Includes platform wind-down guidance and save/load for complete setups.
The developer, RaceTracs Ltd, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- RaceTracs Ltd
- Size
- 3.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 RaceTracs Ltd
