Put tire chains on the drive wheels, on level ground away from traffic, before snowy roads force a stop.
Knowing how to put chains on a car matters long before you’re stuck on a snowy shoulder with traffic whizzing by. The procedure is straightforward: mount chains on the drive axle, tension them correctly, then recheck the fit after a short distance. Get it right and you’ll handle slick passes without drama; get it wrong and you risk damaging your car or losing a chain at speed.
The Right Axle For Chains
Mount chains on at least two tires of the drive axle — that’s the governing rule in California. For a front-wheel-drive car, that’s the front tires. For rear-wheel drive, the rears. For all-wheel drive or four-wheel drive, the chains go on two tires of the same drive axle, not one on each end.
Here’s the catch: an AWD or 4WD vehicle is not automatically exempt. California’s chain-control levels specify when four-wheel-drive vehicles with snow tires may proceed without chains, but those same vehicles must still carry chains during certain posted levels. The sign in front of you dictates what’s required, from merely carrying chains to stopping and installing them immediately.
Chain Installation Basics: Step By Step
The first rule: install chains in a safe, level spot off the roadway — never on a slope or in traffic. Pull fully off the pavement, flip on your hazard flashers, set the parking brake, and shut off the engine. Then lay the chains out flat on the ground in front of the drive tires, untangled, so you can see exactly how they drape.
- Drape the chain over the top of the tire, centering it as evenly as possible from front to back.
- Connect the inside fastener first — reach through the wheel opening to hook the tensioner on the inner side.
- Connect the outside fastener, then tighten both as snugly as you can by hand.
- Drive forward a short distance — roughly 0.3 to 0.6 miles (0.5 to 1 km) — then stop on level ground and retighten everything. Chains settle after the first few rotations.
Also check the fit: if a chain contacts the body, suspension, or brake lines, stop immediately and readjust. One more caution — some vehicle manuals warn against chains on aluminum wheels entirely or require a specific thin wire-type chain. If your owner’s manual has anything to say about chains, it wins.
When Are Chains Legally Required?
California’s chain-control program uses posted signs to set the requirement, and Caltrans defines three levels of control. The most common (R1) requires chains or traction devices on all vehicles except four-wheel-drive vehicles with snow tires on all four wheels. The control level posted at the road determines what applies to you that day.
One specific rule worth knowing: That catches many trucks and larger SUVs that drivers assume are exempt.
Link-type chains and Alternative Traction Devices — cable chains are the common example — both count, as long as they’re approved.
Common Chain Mistakes To Avoid
Two errors cause most of the trouble. The first is assuming all-wheel drive means no chains — as covered above, that’s wrong for many control levels. The second is confusing “carry chains” with “install chains.” A chain-control area can require chains to be present in your vehicle even when you don’t need to put them on yet. Reading car chain reviews before you buy helps you avoid the false economy of cheap chains and the frustration of a bad fit.
Once snow clears, remove chains as soon as you reach bare pavement. Driving on dry roads with chains damages both the chains and your tires — and makes enough racket to alert everyone around you.
| Chain Quick Reference | What To Do |
|---|---|
| Axle choice | Drive axle only; for AWD/4WD, two tires on the same axle |
| Installation spot | Level ground, off the roadway, hazards on, parking brake set |
| Fastening order | Inside fastener first, then outside; tension by hand |
| After driving | Recheck and retighten after roughly 0.3–0.6 miles |
| Legal standard | NACM 92805-compliant links or approved cables |
| Removal | As soon as you hit cleared pavement |
Keep a pair of work gloves and a small flashlight in the trunk with your chains. Practicing installation once in your driveway, before you need it, makes the real thing far less stressful — you’ll know exactly where the fasteners go and how tight is tight enough.
References & Sources
- California Department of Transportation (Caltrans). “Chain Requirements.” Details on chain-control levels, vehicle weight rules, and approved traction device standards.
- California Highway Patrol. “Text of Modified Regulations.” Official regulatory text on tire chain requirements and approved designs.