Review on HIAORS Heavy Duty Chain Roller Tensioner w/Spring for 110cc, 125cc, 140cc Dirt Pit Mini 🚲 Bikes, Moto ATV XR CRF50, 110, 125 SSR SDG, Pit Pro Dirt Bikes, 4 wheelers - Black by Sean Purnomo

Excellent product! That works great! I installed it on my db30 doodlebug mini bike so I can be constantly stressed while riding. Mini bikes are notorious for stretching and throwing chains. I haven't changed the chain since I installed these. You can tell when the chain is stretching and loosening too much as the tensioner starts to operate much more frequently. At this point, simply install the new chain and you will have no problems on the track! My only recommendation for improving the next generation of this product is to upgrade the spring to a stronger and heavier spring and add a roller with bearings to reduce tensioner noise.