Call Today
(916) 922-5297
5431 Stationers Way, Suite A
Sacramento, CA
Store Hours
Mon - Friday: 8:00 AM - 5:00 PM | Closed 12:00pm - 1:00pm
Get Started Now
Get Started Now

RUN THE
NUMBERS

Pre-build math – gear ratio, speed/RPM, tire-size impact, pinion angle. Run it here, then call us to spec the job.

MATH WE DID
SO YOU DON'T HAVE TO

Free calculators for re-gear planning, tire-size impact, speedo correction, and pinion-angle setup. Built in-browser, no sign-up.

GEAR RATIO CALCULATOR

SPEED & RPM

TIRE SIZE CHANGE

TRANSMISSION RATIO

FREE TOOLS

GEAR RATIO CALCULATOR

SPEED & RPM

TIRE SIZE CHANGE

TRANSMISSION RATIO

FREE TOOLS

01 · GEAR RATIO jawsgear.com

Gear Ratio Calculator

Ring & pinion gear ratio from tooth counts.

Gear Ratio — :1
Nearest Standard — :1
Jaws Recommends
03 · RPM jawsgear.com

RPM Calculator

Engine RPM at a given speed for automatic and manual, 1:1 and overdrive.

:1
mph
″
Auto · 1:1 Final Drive — rpm
Auto · .7 Overdrive (AOD) — rpm
Manual · 1:1 Final Drive — rpm
Manual · .7 Overdrive — rpm
Jaws Recommends
02 · TIRE SIZE jawsgear.com

Tire Size Calculator

Overall tire diameter from a metric size (e.g. 225 / 45 / 17).

mm
%
″
Tire Diameter — ″
Sidewall Height — ″
Diameter (mm) — mm
Jaws Recommends
04 · RPM BY TRANS jawsgear.com

RPM by Transmission Ratio

Engine RPM at speed for a specific transmission gear. Pick your transmission to fill the ratio, or enter it manually.

:1
mph
″
:1
Choose an option…
Engine RPM — rpm
Overall Ratio — :1
Jaws Recommends

why choose us

4.5/5.0
88+ Reviews on Google

Real Feedback. Real Results.

bg-testi
Andy Deck
Toyota Tacoma
Took my Tacoma in for a 5.29 regear and they knocked it out fast. Immediately noticed a difference and wish I'd done it sooner. Even on stock wheels and tires, the Tacoma benefits from a regear. Knowledgeable crew, no BS, just solid work. Highly recommend.
Carl Espy
99 Toyota Tacoma
Jeff and Omar were honest and upfront, with great options for my rusty assembly. They troubleshot their way to getting me back on the road. A bad differential isn't fun, but they took their service above and beyond — real knowledge and professionalism.
Justin Brown
This place is great. They stand by their work, have excellent customer service, and quick turn-around times. Would highly recommend them.
Alfredo Luna
Differential Rebuild
Went in for a basic rebuild, and after inspection there were more issues with the differential. Reasonable pricing and they still gave me 10% off labor. Differential feels way better — no more noises or clunking. Thank you!
Tiffany Weber
Quick to accept the truck, quick to fix it! Great price.