How to Size Snow Chains? | Match Your Sidewall Code

For the full breakdown, see our best Universal Snow Chains guide.

A tire that looks identical from across the lot can still need a different chain, because snow chains are sized to the tire itself, not the vehicle you drive. Figuring out how to size snow chains comes down to one string of characters molded into the sidewall — the tire code — plus a quick check of the chain maker’s fit chart and the clearance around your wheel.

The whole process takes about ten minutes and prevents the two classic failures: chains that won’t reach around the tire, and chains that fit the tire but grind into the suspension. Many mountain passes require chains regardless of your tires, and a set sized correctly is the one that actually stays put.

Read the Tire Code on the Sidewall

The size you need is molded into the tire’s sidewall, facing outward, in a format like 205/60R16. Every chain maker sizes to that code, so write the full marking down before you look at any product. The load index and speed rating that follow it matter for tire replacement, not for chains. If the sidewall is dirty, wipe it down first — the full code has to be legible, and a glance at the wrong number buys the wrong chain.

Here is what the code