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Tektro Gemini SL Disc Brake - Black

Tektro Gemini SL Disc Brake - Black

Tektro's entry level 4 piston brake offers outstanding performance for mountain bikes or eBikes at...

Best current price£84.90from Evans Cycles UK

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Evans Cycles UKTektro Gemini Sl Disc Brake Large Black
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£84.90
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FrasersTektro Gemini Sl Disc Brake - Black - Right
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£84.90
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Sports Direct UKTektro Black M535 Gemini Sl Disc Brake in Size L-XL, Sports Direct
£4.99 delivery
£84.90
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Product Information

Full details

The Tektro Gemini SL Disc Brake is designed for mountain bikers and e-bike riders seeking reliable stopping power without a premium price tag. Its key benefit is offering a powerful hydraulic 4-piston system for improved control and confidence on descents and challenging terrain. A potential caveat is its focus on affordability, which might mean a simpler finish compared to higher-end models. This brake features a pre-bled system for easy installation, durable resin pads, and a dimpled 2-finger lever with reach adjustment.

All features

SeriesGemini SL
Model Part Number4717592037012
BrandTektro

Extended Product Information

FAQs

Do I need to bleed the brakes after installation?

No, the Tektro Gemini SL features an EZ Plug-in system and comes pre-bled. You should not need to bleed the brakes if installed correctly.

What type of disc rotors are required?

These brakes require disc rotors with a thickness of 2.3mm. Standard rotors are often 1.8mm or 2.0mm, so ensure you use compatible rotors.

Can I use metallic brake pads with this system?

The Gemini SL comes with low-noise resin brake pads. While some systems can accept metallic pads, it's recommended to use the Tektro-specified pads for optimal performance and to avoid potential damage or noise issues.

Is this brake available for both front and rear wheels?

Yes, the brake is available aftermarket as a Left or Right-hand set, typically corresponding to front (left) and rear (right) configurations depending on your bike's setup and cable routing preferences.

How do I adjust the lever reach?

The dimpled 2-finger lever features a reach adjustment screw. Consult your brake's manual or search for "Tektro lever reach adjustment" to find the specific location and method for your model, typically a small screw on the lever body.

What is included with the brake?

The brake typically includes the caliper, lever with hose, olives, barbs, caliper mount bolts, and compression nut/cover. Disc rotors are not included.

How heavy is the brake?

The stated weights are approximately 300g for the front and 320g for the rear, excluding rotor, adapter, and mounting bolts.

Troubleshooting

Brake lever feels spongy

Although pre-bled, ensure all connections are tight and check for any air in the system. Re-bleeding might be necessary if the issue persists. Ensure the EZ Plug system connections are fully seated.

Brakes are noisy

Clean the rotor and pads with a degreaser. Check that the brake pads are properly seated and not contaminated with oil or grease. Ensure the rotor is true and not warped.

Brake power is weak

Verify that the correct 2.3mm thick rotors are installed. Check pad wear and replace if necessary. Ensure the caliper pistons are moving freely and not sticking. Check for any air in the system.

Lever does not return fully

Check for obstructions around the lever mechanism. Ensure the cable is not binding. Clean and lubricate the lever pivot point if necessary.

Caliper alignment issues

Loosen the caliper mounting bolts slightly, squeeze the brake lever firmly, and then re-tighten the bolts while holding the lever. Ensure the correct mounting bolts are used for your frame/fork.

Pros and Cons

Pros

  • Powerful 4-piston design offers significant stopping power.
  • Pre-bled system simplifies installation and reduces setup time.
  • Affordable option for upgrading to hydraulic 4-piston brakes.
  • Adjustable lever reach enhances rider comfort and control.
  • Low-noise resin pads provide a smooth braking experience.
  • Designed for use on both mountain bikes and e-bikes.

Cons

  • Requires a specific 2.3mm disc rotor thickness (not included).
  • Finish might be less refined compared to higher-end models.
  • Hose requires cutting and specific fittings for installation.
  • Primarily uses resin pads; metallic options may not be standard.
  • Lever blades are available as spares, implying they could be susceptible to damage.

Setup, Compatibility & Care

Setup:

  1. Unpack the brake, noting the separate lever and caliper.
  2. Route the 1.9m hose through your frame, cutting it to the desired length.
  3. Install the olive and barb into the cut hose end.
  4. Attach the hose to the lever using the compression nut and cover, ensuring a secure connection.
  5. Mount the caliper to your frame's post mount using appropriate bolts (2.3mm rotors are required, not included).
  6. Follow manufacturer guidelines for lever and caliper alignment before final tightening.

Compatibility:

  • Mounting: Post Mount caliper.
  • Frame/Fork: Requires compatible post mounts.
  • Rotors: Requires 2.3mm thick disc rotors (standard rotors are typically 1.8mm or 2.0mm, so ensure compatibility or purchase new rotors).
  • Levers: Left and Right hand specific for front and rear applications.

Care:

  • Cleaning: Regularly clean the caliper, rotor, and lever with a mild degreaser and water. Avoid spraying lubricants directly onto the braking surfaces.
  • Pad Replacement: The Q13RS 5mm extra-thick resin pads are designed for easy replacement. Ensure the brake is clean and the caliper pistons are retracted before removing old pads and installing new ones.
  • Hose Maintenance: Periodically check the hose for any signs of wear or damage. Ensure connections at the lever and caliper remain tight.

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