Mountain Bike Chain Size. Keep in mind when you get a new bike chain there's a good chance that it's going to be too long for your drivetrain as is, so you need to know how to size a bike chain. Decide what kind of bicycle you need.
To check if it was the correct size, shift the bike to the smallest sprockets and check the chain for any slack. Bike chains are designed to shift smoothly, stay strong, and keep you rolling for miles. Well, a chainring is the round, spiky bit connected to your cranks that pulls the chain round.
However, using a chain one size narrower than standard rarely presents any problem.
Read the manual before taking your first ride on your new Mongoose.
Travel back to the beginning of full-suspension mountain bikes. What will you use it for? If you don't have the original chain or it's the wrong size, use the largest cog and chainring to find the cutting point on the new chain.