Park Tool 4th Hand Brake Cable Stretcher BT-2 — Locking Ratchet, Cushioned Grips

The Park Tool BT-2 4th Hand Brake with Locking Ratchet is a one-handed cable stretcher that locks securely to hold brake and derailleur cables tight while you finish adjustments.

When you need steady tension on a brake or derailleur cable to set the correct pull and then fasten the anchor bolt, the BT-2 acts as a reliable extra hand. Built from heat-treated, chrome-plated steel with cushioned grips and a thumb-actuated locking ratchet, it simplifies fine-tuning and reduces slippage so your bike components stay where you set them. Lightweight and compact, it fits comfortably in a mechanic's toolbox or home-workstand kit.

How does the BT-2 make brake and derailleur adjustments easier?

The BT-2 holds cable tension so you can use both hands to tighten or align components without the cable slipping back. Its locking ratchet maintains steady pull and releases quickly when you’re done, preventing frustration and rework during setup.

• One-hand operation with thumb lock frees the other hand for bolts or centering calipers.
• Ratchet teeth provide incremental control and secure holding force.
• Cushion grips improve comfort during repetitive tuning tasks.

What build quality and materials should I expect from this tool?

The BT-2 is manufactured from heat-treated steel with a chrome-plated finish to resist wear and provide lasting strength under repeated tensioning. The construction is aimed at regular workshop use and holds up to the stresses of cable stretching without bending or deforming.

• Heat-treated steel body for durability under load.
• Chrome plating resists corrosion and eases cleaning.
• Cushioned handles reduce hand fatigue during extended use.

When should I use the BT-2 versus other cable-holding tools?

Use the BT-2 whenever you need a quick, secure temporary clamp for brake or derailleur cables—especially during pad alignment, clamp bolt tightening, or indexed shifting setup. It’s optimized for tasks where a compact, one-handed stretcher is faster and more convenient than larger vise-style tools.

• Ideal for brake pad centering and caliper alignment on road and mountain bikes.
• Handy for tightening anchor bolts while keeping cable tension consistent.
• Better for quick workshop or roadside tweaks than bulkier clamping systems.

How do I operate and maintain the BT-2 safely?

To use the BT-2, place the cable in the jaws, squeeze the cushioned handles to tension the cable, then engage the thumb lock to maintain tension while you tighten mounting hardware. After adjustments, disengage the locking ratchet and release the cable; keep the tool clean and light oil on the ratchet pivot to preserve smooth operation.

• Position cable in the jaws, squeeze handles, then flip the thumb lock to hold tension.
• Release lock and carefully open handles to free the cable after adjustment.
• Wipe off grime and apply light lubricant to the ratchet pivot for long life.

Who is this for: The Park Tool BT-2 is designed for bicycle mechanics, bike shop technicians, and home mechanics who value precise, repeatable cable tensioning during brake and derailleur setup. If you regularly build, tune, or maintain cable-actuated components and prefer a compact, dependable stretcher that frees one hand for final adjustments, the BT-2 is a practical addition to your tool kit.