Most new mountain bikes are shipping with a one-by drivetrain. Depending on the style of bike, and the range on the cassette, stock builds may see anywhere from a 30 to a 36 tooth ring up front. Yet depending on your riding and style and terrain, the stock ring size might not work for you. Fortunately it’s usually an easy and inexpensive swap.
What Size Chainring Are You Running on Your Mountain Bike?
Depending on the style of bike, and the range on the cassette, stock MTB builds may see anywhere from a 30 to a 36 tooth ring up front.