Tektro RX4.1
Tektro

Tektro RX4.1

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Tektro RX4.1 brake levers are forged-aluminum TT/tri levers with an expanding plug clamp that fits 19.6–20.6 mm aero bars. Reach and return-spring adjustment give confident modulation for caliper and cantilever brakes.

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Product Details

Overview & Technology

Tektro's RX4.1 is a purpose-built TT/triathlon brake lever designed for aero extensions and time-trial cockpit setups. The lever blade is forged from aluminum for a balance of light weight, stiffness and long-term durability, while the expanding plug clamp secures the lever inside aero bars with a 19.6–20.6 mm internal diameter. The RX4.1 uses a simple, proven mechanical design: a forged lever blade, integrated return spring and reach adjust to fine-tune fingertip position. That combination delivers consistent braking modulation on both caliper and cantilever systems without complex mounting hardware — ideal for racers and committed triathletes who want reliable stopping power tucked behind the aero bars.

Key Features

Built for aero bars: The RX4.1 uses an expanding plug clamp style that fits most clip-on or bolt-on aero extensions with an ID between 19.6 and 20.6 mm. Installation is clean and low-profile, keeping the lever secure inside the extension for a tidy cockpit. Performance-focused details: • Forged aluminum lever blade for strength and responsive feel. • Return spring and reach adjustment to suit hand size and glove thickness. • Compatible with caliper and cantilever brakes for broad brake system support. • Black finish for a stealth, race-ready look.

Fit & Compatibility

The RX4.1 is specifically made for aero/tucked hand positions and fits aero extensions with an internal diameter of 19.6–20.6 mm. It accepts standard brake cables and is compatible with traditional caliper and cantilever brake types — the most common setups on time-trial and triathlon bikes. These levers are sold as left and right positions and use a plug-style expansion clamp rather than an external band. That means they won't slide on properly on oversized or undersized bars, so verify your extension ID before buying. The RX4.1 is not designed for modern direct-mount road calipers that require integrated controls; instead it pairs with standard cable-pull caliper and cantilever systems.

Who It's For

The RX4.1 is aimed at triathletes and time-trial riders who want a durable, no-nonsense brake lever tucked into their aero extensions. It's a great option for racers on a budget who still want forged-aluminum construction and adjustability. Choose the RX4.1 if you run traditional caliper or cantilever brakes on your TT bike or if you need a compact lever solution for training and racing setups where a clean, low-profile cockpit matters.

Key Features

  • ✓ Forged aluminum lever blade for stiffness and long-term durability
  • ✓ Expanding plug clamp fits aero bars with 19.6–20.6 mm internal diameter
  • ✓ Works with standard caliper and cantilever brake systems
  • ✓ Integrated reach adjustment for fingertip positioning
  • ✓ Return spring for positive lever return and consistent modulation
  • ✓ Low-profile black finish keeps a clean, race-ready cockpit
  • ✓ Sold as left and right positions for symmetric installation

Specifications

Brake Lever Clamp plug clamp style to fit 19.6 - 20.6 mm ID aero bars
Brake Lever Comp. Caliper and cantilever brakes
Lever Blade Material Aluminum
Position Left and Right
Primary Color Black
Reach Adjust Yes

Product Identifiers

Vendor Item # ABBL000529
UPC 770612290815
EAN 4717592008630

Frequently Asked Questions

Will these levers fit my aero extensions?

The RX4.1 uses an expanding plug clamp and fits aero extensions with an internal diameter of 19.6–20.6 mm. Measure your extension ID before purchase — if it falls outside that range the clamp won't seat securely.

Are the RX4.1 levers compatible with modern road calipers?

They are compatible with standard cable-pull caliper and cantilever brakes. Some modern direct-mount or integrated road calipers may use different cable routing or pull ratios and may not pair ideally with these levers.

Can I adjust lever reach and feel?

Yes — the RX4.1 includes a reach adjustment to position the lever closer or farther from your fingertips, plus a return spring for consistent lever reset. These adjustments let you tailor ergonomics for gloves and hand size.

How are the levers mounted to the bar?

They mount inside the aero extension using an expanding plug clamp. When tightened, the plug expands inside the tube wall to create a secure, low-profile bond without an external band.

Do these levers come as a pair?

The RX4.1 is available in left and right positions to outfit both sides of an aero cockpit. Check the product variant to ensure you order the quantity/side you need.

What maintenance do these levers require?

Periodic cable and housing inspection, a light application of lubricant to the pivot if needed, and ensuring the plug clamp remains securely tightened are the primary maintenance tasks. Replace worn cables and housings to maintain braking performance.

Buying Guide

When shopping for TT/tri brake levers, prioritize clamp compatibility and adjustability. Measure the internal diameter of your aero extensions and confirm the lever's mounting method — expanding plug clamps like the RX4.1 deliver a clean, integrated install but require a matching ID. Check that your brake system is a standard cable-pull caliper or cantilever setup; direct-mount or electronic brakes may need a different solution. Material and ergonomics matter: forged aluminum offers a reliable mix of stiffness and light weight, while reach and return-spring adjustments let you dial in fingertip position for long efforts. Finally, match new levers with fresh cables, housing and properly tuned calipers for the best stopping power on race day.

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