Setup calculator, diagnostic troubleshooter, session logger, and rulebook — all in your pocket. Built for racers who wrench their own cars and chase every tenth.
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Click the track conditions below and watch the recommendations change in real-time.
Live Demo
Track Condition
LF
RF
LR
RR
LF
14
RF
14
LR
13
RR
13
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Match your rear gear, transmission, and tire diameter to find the RPM sweet spot for any short track. See exactly where peak torque and peak HP land at every speed.
Transmission
Drivetrain
Engine Reference RPMs
Analysis
Peak torque at 89 mph — may be too tall for this track. Consider a numerically higher (shorter) rear gear.
Peak HP at 114 mph — you'll never reach peak power on this track. Shorter gear needed.
Peak Torque Speed
89 mph
Peak HP Speed
114 mph
RPM at Speed
| MPH | 1st | 2nd | 3rd |
|---|---|---|---|
| 10 | 1,192 | 719 | 473 |
| 15 | 1,788 | 1,079 | 710 |
| 20 | 2,385 | 1,438 | 946 |
| 25 | 2,981 | 1,798 | 1,183 |
| 30 | 3,577 | 2,157 | 1,419 |
| 35 | 4,173 | 2,517 | 1,656 |
| 40 | 4,769 | 2,877 | 1,893 |
| 45 | 5,365 | 3,236 | 2,129 |
| 50 | 5,961 | 3,596 | 2,366 |
| 55 | 6,558 | 3,955 | 2,602 |
| 60 | 7,154 | 4,315 | 2,839 |
| 65 | 7,750 | 4,674 | 3,075 |
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Enter your scale readings to calculate cross-weight percentage, weight distribution, and get jack bolt adjustment recommendations — no account required.
Scale Readings (lbs)
Targets
Results
Total Weight
2800
lbs
Cross Weight
50.0%
RF + LR = 1400 lbs
Left %
50.0%
1400 lbs
Rear %
41.1%
1150 lbs
Diagonal Bias
0.0%
Balanced
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Beyond the Calculator
Diagnosis, engine builds, session data, corner weights, gear ratios — everything you need to find your tenths.
355 SBC Build
Peak HP
387
@ 5,800 RPM
Peak TQ
452
@ 4,200 RPM
Power Curve
Springfield Raceway
Tacky conditions
Best Lap
14.832
Finish
P3
Handling Feel
Entry
Tight
Mid
Neutral
Exit
Loose
Searchable class rules with tech inspection checklist
Backspacing and offset calculator for any wheel
Simple Pricing
Everything you need to get faster is free. Upgrade to Pro for advanced tools.
Tenths was built by racers who got tired of guessing. We wanted real setup data, real diagnostics, and a real log of what works — without needing a professional crew.
Whether you run street stock, modified, late model, or figure 8 — if you wrench your own car and want to find your tenths, this is for you.
Find Your Tenths