Great to have a quick calculator on hand when at the track. Nice to have a compare feature to see current and new gear change calculation.
Chris W.
Helps me go fast.
Zaulu B.
Good app - it really lets you see what you are doing when pairing your gears. I would recommend it for anybody trying to hit high speed.
Cody B.
Helped me get a perfect top out speed and keep good temps.
Mark F.
Must-have.
Ian C.
Something every racer should have
Travis W.
Fast, simple, free and accurate.
Alan L.
Easy to use and covers a wide range of models
William W.
This app is a big help to me to actually know and see what my drag car is doing. Very useful app, highly recommend it to anyone who drag races.
Clay B
AWESOME APP FOR RC NO PREP OUTLAW! GOD BLESS ✝️
Louis M.
Very easy and intuitive to use. It has been really helpful pairing different spur and pinion gears. No guessing or calculations needed. 0 % or 10 percent change, or whatever change, it shows you.
Cole M.
Great little tool, get their other app too, called "SO DIALED." It's a lifesaver for tuning!
Jonathan H.
Excellent tool to manage your desired FDR. I use it on my touring car and my 1/12 pan car.
Kris D.
Great info fast. Makes changing gears very quick
Billy J
This app is so helpful. It's a great tool to get your RC where you would like it to be.
Heath M.
It has changed me as a human, made me care a little more about humanity and the fellow creatures on this Earth. It's also a great R/C gear calculator.
Michael D.
Life saver...awesome app that helps tremendously.
Dane K.
Works great - easy way to figure out final rollout.
Bryan T.
Excellent app for all tuning needs
Jason R.
Easy to use, and convenient!
Benjamin C.
Perfect.
Online Gear Ratio Calculator
Looking for a quick gear calculation, so you don't have to download an app? Try our gear ratio and rollout calculator to find the right pinion and spur for your car, whether it's Team Associated, Tamiya, Traxxas, or any other make. Enter your car's internal drive ratio to see the final drive ratio (FDR), and see the percentage change in gearing you'll get from a new pinion and spur.
Gears & Ratios
Enter your gearing to see the how your ratio will change.
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Get our free Gear Calculator App (links above), or try our Gear Recommender App!
Looking to calculate the top speed of your car? Try our RC Speed Calculator App!
Change Impact Chart
Click/tap the gears to see how new gears will affect your ratio:
Negative changes indicate a steeper ratio: higher top speed, but more strain on the motor/engine. Positive changes give more acceleration and put less strain on the motor/engine.
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