Up-Travel and Down-Travel: Why Both Halves Matter on the Trail

Up-Travel and Down-Travel: Why Both Halves Matter on the Trail

Off-road suspension conversations always focus on how high you can lift — but the number that actually decides whether you crawl a rock or high-center on it is down-travel. And the number that decides whether you blow a shock apart on a whoop section is up-travel. Both halves matter, and most builds get the balance wrong.

The Two Halves of Wheel Travel

• Up-travel is how far the wheel can rise from ride height before it hits the bump stop.
• Down-travel is how far the wheel can drop from ride height before it tops out.

Total travel = up + down. But where you set ride height inside that travel decides everything about how the truck behaves off-road.

Why Down-Travel Is the Secret on the Trail

On a trail, the truck is constantly in articulation — one wheel drops into a hole, the opposite side compresses. Down-travel is what lets that dropped wheel stay planted and keep weight on the tire. Run out of down-travel and the wheel lifts, loses contact, and you're spinning air instead of crawling.

A lifted truck with short shocks has plenty of up-travel and almost no down-travel. It looks great and articulates like a skateboard.

Why Up-Travel Protects the Truck

Up-travel is your bump-stop cushion. Every whoop, every ditch, every rock ledge compresses the suspension — and if you run out, the energy goes into the bump stop, the chassis, and eventually the shock shaft. Too little up-travel and you bend shock mounts on the first hard hit.

The Balance Most Builders Miss

A good off-road setup splits total travel roughly 60/40 in favor of up-travel at ride height:

• 60% up-travel — absorbs hits without bottoming the shock.
• 40% down-travel — enough to articulate without the wheel lifting immediately.

Lifted trucks with extended shocks run the opposite by accident — tons of down, almost no up — and they ride like a pogo stick because they're constantly on the bump stop.

How to Set It Right

1. Measure total shock stroke from full extension to bump-stop contact.
2. Set ride height so 60% of that stroke is above the collar, 40% below.
3. Confirm with the wheels off the ground — at full droop, the shock should be near (but not at) full extension. At full stuff, the bump stop should just barely touch.

The lift gives you the room for travel. The shock length and ride-height position decide whether you actually use it.