The Duluth Cycle Advanced 2-Stroke Motorized Bicycle Chain Tensioner is designed to fit all 2-stroke motorized bicycle engines, including:
- 49cc engines
- 66cc engines
- 80cc engines
Key Compatibility Features
Our CNC-machined tensioner includes countersunk mounting holes, which means your pedals will never scrape or have clearance issues during installation. This universal design works with the vast majority of 2-stroke motorized bicycle engine kits on the market.
What Makes Our Tensioner Different
Unlike standard tensioners that come with engine kits, our advanced spring-loaded design:
- Automatically maintains proper chain tension
- Reduces chain noise and vibration
- Prevents chain derailment
- Works with standard #415 motorized bicycle chain
Before You Order
While our tensioner fits 49cc, 66cc, and 80cc 2-stroke engines, we recommend verifying your bike has adequate frame clearance. Most standard bicycle frames accommodate our tensioner without issues.
Jan 13, 2026