Rally computers and tripmeters built on what crews tell us — from the jungles of Asia to the high-speed stages of the WRC.
Professional-grade precision, made accessible — for seasoned crews and the next generation of rally enthusiasts.
ARM products designs and builds rally computers and tripmeters in Japan. Every model starts from what crews need on the stage: readings they can trust, controls they can use with gloves on, and displays they can read at a glance.
Our "Made in Japan" quality is shaped by the feedback and demands of rally competitors around the world.


Two ways to measure distance. Pick the one that suits your car and your events, then see the models.
GPS measurement
Distance from satellites, with no wiring to the car. Mount it, power it and go: ideal for rally raids and for crews who move between cars.
Twin Trip GPS2027 · TT Raid · G-Trip Compact (soon) · Rally Computer GPS (soon)
See GNSS models →Vehicle speed pulse
Distance from the car’s own speed sensor, stable in tunnels, forests and under any sky. Wired once, precise on every stage.
Twin Trip SS2027 · Twin Trip SS2018 · P-Trip (soon) · Rally Computer
See speed-signal models →The details crews ask for, in every model where they fit.
Match any road book with one factor: ARM distance ÷ road book distance.
Hold the distance or subtract it when you go back after a wrong turn.
See how much time you have in hand against the target average before the next TC.
Blinking display and LED before and above your limit — ready for liaison sections.
Show distances under 10 km to the metre for clearer pace notes.
Trips, calibration and settings are kept when the power is off.
Tell us your car and your events — we’ll help you choose.
