BMX Race Chain Tensioner
Prevent your rear wheel from slipping and ensure maximum power transfer with high-quality BMX Race Chain Tensioners. From universal clip-on tensioners to frame-specific axle guide blocks (e.g. for Meybo or Inspyre) – we have the right setup to keep your wheel aligned and your chain tight. Check the compatibility guide below to find the correct fit for your dropout and axle size.
BMX Race Chain Tensioner FAQBMX Race Chain Tensioner Range
BMX Race Chain Tensioner FAQ
What are BMX Race Chain Tensioners and what is their main purpose?
Chain Tensioners prevent the rear wheel from being pulled forward by the immense chain torque during the start (the "snap"). In modern BMX racing, they serve a second, equally important function: Wheel Alignment. They act as Axle Guides to ensure the rear wheel sits perfectly straight in the dropouts, which is critical for the precise alignment of disc brake rotors.
How is a Chain Tensioner constructed?
- Tensioner Body / Block
- Either an external clamp (universal) or an internal CNC-machined block (integrated) that sits inside the dropout.
- Adjusting Bolt
- A long threaded bolt that pushes against the frame or dropout to pull the axle backward.
- Axle Guide / Adapter
- Specific inserts (often found in Meybo kits) that reduce the dropout size (e.g., from 15mm to 10mm) and guide the axle.
What types of Chain Tensioners are there?
The choice is dictated 100% by your frame:
- External (Universal): Clamps onto the rear of the dropout. Fits most older or standard frames with open dropouts.
- Integrated (Frame Specific): Utilizing sliding blocks that fit inside the dropout. These are specific to the frame brand (e.g. Meybo Holeshot/HSX or Inspyre). They often combine the tensioner and the disc brake mount.
What materials are used?
- Aluminum 6061/7075
- Used for the bodies and blocks to ensure stiffness and low weight.
- Stainless Steel
- Mostly used for the adjusting bolts to prevent stripping and rust.
Which Chain Tensioner is right for my frame?
Caution: Compatibility is key here. Modern race frames rarely accept generic tensioners. Use this guide:
| Frame Type | Required System | Check Axle Size! |
|---|---|---|
| Standard / Entry Level | Universal External (Clip-On) | Usually 10mm (3/8") |
| Meybo (Holeshot/HSX) | Meybo Specific Blocks | 10mm, 15mm, or 20mm (Must match hub!) |
| Inspyre | Inspyre Integrated | 10mm or 20mm (Specific inserts) |
| Thru-Axle Frames | Integrated Plates | 15mm or 20mm Thru-Axle |
How do I install Integrated Chain Tensioners (Blocks)?
- Remove the rear wheel and clean the dropouts.
- Insert the correct Axle Guide Blocks (matching your axle diameter: 10, 15, or 20mm) into the dropout.
- Insert the adjusting bolts but do not tighten them fully yet.
- Install the wheel. Ensure the axle sits firmly inside the guide blocks.
- Tighten the adjusting bolts evenly on both sides to tension the chain AND align the wheel (check the gap between tire and frame).
- Important for Disc Brakes: Ensure the rotor runs centrally in the caliper before finally torquing the axle nuts/thru-axle.
How do I maintain my tensioners?
- Grease the bolts: The long adjusting bolts are under high stress. Grease the threads to prevent them from seizing or stripping.
- Check for compression: Aluminum blocks can compress over time. If they deform, they may need replacement to ensure the axle doesn't slip.
