# Moto Gear Ratio Calculator — Sprocket, chain & speedo tools

> Motorcycle gearing calculator for speed, RPM, and sprocket analysis. (iPhone/iPad app by Vladislav Zhirnov.)

- Source: https://appshunter.io/ios/app/moto-gear-ratio-calculator/id6760316131 (this page in markdown: same URL + `.md`)
- Developer: [Vladislav Zhirnov](https://appshunter.io/developer/1476188065)
- Category: Utilities, Reference
- Price: Free with in-app purchases (on sale, was $1.99)
- Rating: 1.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 7 MB
- Languages: American English, Arabic, Croatian, Czech, Danish, Dutch, Finnish, French (France), German (Germany), Greek and 22 more
- Released: 2026-03-13
- Data updated: 2026-11-05
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/moto-gear-ratio-calculator/id6760316131/reviews.md

## What is Moto Gear Ratio Calculator?

Moto Gear is a set of 16 calculators for people who actually work on motorcycles — riders chasing the right gearing, track-day regulars, racers, tuners and mechanics. Every tool reads from one shared bike, so change a sprocket in one place and the chain length, speedometer error and top speed update everywhere. Every result exports as a PDF with your inputs, the numbers and the drawings, ready to print or send to a customer.

GEARING & SPROCKETS

Gearing Analyzer (free): speed in every gear at any RPM, tachometer and speedometer gauges, shift-point graph, speed table, compare ratio sets and sprocket combinations. Save your bikes.
Sprocket Matrix: a front × rear grid showing final ratio, percentage change, top speed at redline or RPM at cruising speed — find the combination that does what you want, then tap it.
RPM at Speed: engine speed in every gear at a road speed, or road speed at an RPM, for your current and planned setups.
Ratios from Teeth: enter tooth counts and get primary and gearbox ratios, the RPM drop at every shift, and push them straight into the analyzer.

CHAIN

Chain Length: how many links the new sprockets need, whether your current chain still fits and how far the rear axle moves — in millimetres and against your adjuster range. Exact geometry, not a rule of thumb.
Chain Wear Pattern: hunting-tooth analysis showing how evenly links and teeth share the load, and which link counts wear best.
Chain Stretch: elongation from a pin-to-pin measurement against the manufacturer's limit, plus a slack check.

TIRES & SPEEDOMETER

Tire Size Compare: metric, inch and alpha sizes (190/55 ZR17, 4.00-18, MT90B16), diameter, circumference, ride height, speedometer effect and the equivalent sprocket change.
Speedometer Error: indicated versus true speed after sprocket or tire changes, with the sensor location taken into account, a correction factor for speedo healers and an odometer check.

SUSPENSION

Suspension Sag: free and rider sag from L1/L2/L3 measurements, targets for street and track, how much preload to add or remove, and whether your spring rate suits you.

ENGINE

Engine Builder: displacement, compression ratio from chamber, gasket, deck and piston volumes, bore/stroke and rod ratios, mean and peak piston speed, and what it takes to reach a target compression.
Degree Wheel: durations, lobe centrelines, lobe separation and overlap from your cam card, a piston-stop TDC finder, and a printable full-scale degree wheel with a check bar.

TOOLS

Pulley & Belt, Power to Weight (with quarter-mile estimates), Fuel Range and a mechanic's unit converter (torque, pressure, spring rate, fuel economy, chain pitch).

BUILT FOR THE WORKSHOP

Metric or imperial everywhere, switchable at any time.
Diagrams drawn to scale: chain runs with the axle movement, tire overlays, sag bars, dual-needle speedo, tooth-contact rings.
PDF reports for every calculator.
Formulas checked against manufacturer manuals and engineering references, and documented in each report.
Works offline. No account, no tracking.

FREE AND PRO The Gearing Analyzer is free, with no limits. Every other calculator gives you three free calculations to try it on your own bike. Moto Gear Pro unlocks all 16 calculators and PDF export, as a monthly or yearly subscription or a one-time lifetime purchase. If you bought the original paid app, everything stays unlocked — forever.

Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period and can be managed in your App Store account settings. 
Privacy policy: https://zhsystems.me/privacy-policy-moto-gear-ratio-calculator-rpm/
Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Calculate speed at any RPM
- Visualize shift points
- Compare sprocket combinations
- Interactive gauges and graphs
- Save and export bike configurations
- Supports 3-8 speed transmissions

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Monthly | $1.99 | per month |
| Pro — Yearly | $7.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro — Lifetime | $14.99 | one-time |


## Is Moto Gear Ratio Calculator safe?

Not enough ratings yet to assess Moto Gear Ratio Calculator.

## Is Moto Gear Ratio Calculator legit?

Moto Gear Ratio Calculator is no longer available in the App Store. The AppsHunter Legitimacy Score for Moto Gear Ratio Calculator is 35 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/moto-gear-ratio-calculator/id6760316131/reviews.md

### 1/5 — アプリ立ち上がりません

*2026-08-21*

アプリ起動しないですね。詐欺か？

## Frequently asked questions about Moto Gear Ratio Calculator

### What is Moto Gear Ratio Calculator RPM used for?

Moto Gear Ratio Calculator RPM is used to analyze motorcycle gearing. It helps you calculate exact speed at any RPM, visualize shift points, and compare different sprocket combinations to optimize your bike's performance.

### How does Moto Gear Ratio Calculator RPM help with tuning?

The app provides interactive gauges and graphs to visualize RPM drops and speed at each shift. You can also use the Sprocket Spread graph to discover equivalent ratio combinations and compare sprocket sets to fine-tune your drivetrain.

### Can I compare different sprocket sizes with Moto Gear Ratio Calculator RPM?

Yes, you can toggle the Compare Sprockets feature to add a second front/rear sprocket set. The speedometer will then show two needles simultaneously, allowing you to see precisely how a sprocket swap affects your speed in every gear.

### What kind of reports can I generate with Moto Gear Ratio Calculator RPM?

You can export a comprehensive PDF report that includes all your input data, speed tables, shift point analysis, and sprocket comparisons. This is ideal for sharing with your mechanic or posting on motorcycle forums.

### Does Moto Gear Ratio Calculator RPM have ads?

No, Moto Gear Ratio Calculator RPM does not contain advertisements. The app is designed to provide a seamless experience without interruptions.

### What is the pricing for Moto Gear Ratio Calculator RPM?

Moto Gear Ratio Calculator RPM is available for a one-time purchase of $1.99. This grants you full access to all features without any subscriptions or in-app purchases.

### What devices is Moto Gear Ratio Calculator RPM compatible with?

Moto Gear Ratio Calculator RPM is compatible with iPhone and iPad devices. It is rated for users aged 4 and up.

### How often is Moto Gear Ratio Calculator RPM updated?

The app was last updated on March 13, 2026, with version 1.0. Future updates will likely address bug fixes and potential new features based on user feedback.

## Version history (last 2 releases)

### 2 — 2026-10-22

Moto Gear 2.0 turns the gearing calculator into a full workshop: 15 new calculators (chain length, sprocket matrix, speedometer error, tire sizes, suspension sag, engine builder, degree wheel and more), one shared bike across all tools, metric/imperial switch, to-scale diagrams and PDF reports everywhere. The Gearing Analyzer stays free; original purchasers keep every feature.

### 1.0 — 2026-03-13

No release notes.

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All apps by Vladislav Zhirnov: https://appshunter.io/developer/1476188065

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-05.*