My Combo — Enter Your Car Once

My Combo — enter your car once

Every calculator on RaceCombo reads from this one form. Save it here and the weight, tire, gear and engine fields fill themselves in everywhere — on this device, in your browser. Nothing is uploaded, nothing is tracked; your combo lives on your phone, where you use it.

Your saved comboStored only in this browser (localStorage)

How it works

Fill it in once

Weight, tire, gear, engine basics.

Every calculator pre-fills

Open any tool and your numbers are already there. Edit per-run if you like — the saved combo doesn't change.

Private by design

No account, no server. Clear your browser data and it's gone — that's the trade, and we think it's the right one.

Racers guard their combos. So do we — by never having it.

Why one combo matters

The old way: retype your weight, tire and gear into every calculator, every time, on a phone in the sun. One typo and two calculators disagree about your own car. The combo fixes that — a single source of truth for your setup, so the horsepower estimate, the gear math and the converter check are all talking about the same car.

Ready for race day?

Your combo plus a logbook is where tuning stops being folklore. The free calculators tell you what the numbers are; the Tuning System keeps them organized across a season.

The $39 Tuning System adds the run logbook, the DA/jetting tracker and the gear & tire planner on top of your combo. See what's inside →