Park Tool OBW-4 Offset Brake Wrench

The Park Tool OBW-4 Offset Brake Wrench is built for precise adjustments on side-pull and dual-pivot rim brakes, especially where access is tight. Its slim offset shape lets you reach around brake calipers to center them easily without interfering with other components.

Featuring four common wrench openings (10 mm, 11 mm, 12 mm, 13 mm), this tool covers most nut sizes used on brake caliper pivot bolts. Its hardened construction ensures durability, while the offset design increases leverage and accessibility for home mechanics or pro shops alike.

Specs at a Glance

• Tool Type: Offset brake wrench / centering wrench
• Sizes Included: 10 mm, 11 mm, 12 mm, 13 mm openings
• Configuration: Offset, thin profile for tight spots
• Use Case: Side-pull and dual-pivot rim brake calipers
• Material / Finish: Hardened steel (professional-grade build)
• Part Number: OBW-4

Design Benefits

1. Access in tight spaces: Offset shape allows alignment and adjustments where standard wrenches won’t fit.
2. Multiple sizes: Four common metric sizes cover most brake pivot flats.
3. Sturdy build: Hardened material resists wear and keeps wrench flats from rounding over time.
4. Better leverage: Offset design gives more torque in constrained positions.

Final Take

The Park Tool OBW-4 is an essential tool for any bike mechanic’s kit when working on rim brakes. It delivers versatility across sizes, access in tight areas, and long-lasting performance—especially helpful for centering brakes cleanly without hassle.