This is our chain tensioner with springs for all versions of the Razor MX350 and MX400 Dirt Rockets. Because chain tensioner springs are often lost or missing, we include an extra spring. Put the spare spring somewhere safe because you never know when you may need it!

A chain tensioner is an important part of the drive system and should be replaced if damaged or lost. A faulty chain tensioner can be identified by a loose chain that falls off during ride time. If the unfortunate happens and you need a new tension or spring, aren't you glad that we are only a mouse click or screen tap away?

⚠ WARNING California Residents: Proposition 65 Warning