Ninety percent of the bicyclists killed in biking accidents over the past two decades were not wearing a helmet. Consumer Reports just safety tested 23 helmets to see how well they will protect you in an accident.

The first test uses a sensor to detect how much force would be transmitted to the rider’s head in a crash. The second test checks the strength of the chin strap.

One helmet, the Cannondale Teramo, didn’t pass the strap test and may pose a safety risk because it could come off in an accident. In four of the five samples tested, the buckle snapped or broke into pieces. Consumer Reports is not aware of any injuries as a result of the Cannondale Teramo buckle issue. The company says it stands behind its third-party independent test results, but Consumer Reports does not recommend buying the Cannondale Teramo.

However, Consumer Reports did find several good choices. Top-rated is the Scott Arx Plus for $170. It scored “Excellent” in impact resistance and fit adjustments. It was “Very Good” for ventilation, and it’s also a lightweight helmet.

Consumer Reports found several other Best Buys that cost far less, including the Lazer Cyclone for $55.

When it comes to children’s helmets, the Bontrager Solstice Youth for $45 was top rated.

If you want your helmet to last, be careful how you handle it. Don’t just toss it into the trunk of your car, because heat can affect performance. And you don’t want to get even minor dents into the lining, which is what absorbs the impact.

If you are ever in an accident, even if you can’t see any damage to your helmet, replace it.