How to Find the Serial Number and Model Year of a Trek Bike

On most Trek bikes, the serial number is stamped under the bottom bracket, where the cranks meet the frame. If it isn’t there, check the lower end of the seat tube.

You’ll usually need to turn the bike over or tilt it on its side to see it. Be careful when you do this, as you can damage the LCD if it’s mounted on your handlebars. I usually rest it on a rag or put something under the bars to raise it off the ground. Also, get some help if you struggle with the bike’s weight; an e-Bike landing on your foot isn’t a great start to anyone’s day.

Modern Trek serial numbers are a mix of letters and numbers, and you might hear them called frame numbers too.

The underside of the bottom bracket collects a lot of dirt, so wipe it down with a damp cloth first.

If the number is worn, scratched, or hidden by paint damage, check your paperwork instead. It may be on your original receipt or in your order confirmation email. If you registered the bike, it should also be on Trek’s bike registration page.

The serial number identifies your frame, but finding the model year usually takes a couple of extra steps. I’d start with the model name on the frame, which is normally on the top tube or down tube. Then contact Trek or a Trek retailer with the serial number, as they can look up the year for you.

Trek’s color schemes and decal styles change most years, so comparing them with old catalogs can narrow it down. Some guides say the last letter of a modern Trek serial shows the year, but I wouldn’t rely on it. It doesn’t always match, so it’s best to check with Trek.

Also, the model year isn’t always the year the bike was made, as brands often make bikes months in advance.

Knowing your Trek’s model year makes life easier when you want to sell it. Our value calculator asks for it, along with the brand, bike type, retail price, and mileage. If you then decide to sell your e-Bike to us, we’ll send you an official offer.

The year also affects the price, as some brands hold their value better than others. It also saves guesswork when you’re ordering parts, as a part from one model year doesn’t always fit the next.

If you’d rather buy a Trek than sell one, we sell pre-owned Treks alongside plenty of other brands. Every bike we sell passes a 50-point inspection, and its battery must hold at least 80% of its original capacity. We’ll deliver it to your door, with a one-year warranty and 14 days to change your mind.