1250mm long line. Fit all 16in bikes. Caliper and Line ONLY. Does not include the lever

Upgrade your stopping power with Zoom 4-Piston Hydraulic Brake Calipers — engineered for riders who demand stronger, smoother, and more controlled braking performance.

Why Choose 4-Piston Over 2-Piston?

Unlike traditional 2-piston calipers, a 4-piston design delivers:

Increased Braking Power – Four pistons apply more even pressure across the brake pads, creating stronger and more consistent stopping force.
Better Heat Management – Improved pad contact distributes heat more efficiently, reducing brake fade on long descents.
Enhanced Modulation – Smoother, more precise control lets you fine-tune braking power without sudden grabbing.
Improved Pad Wear – Even pressure means pads wear more uniformly, extending their lifespan.

Light Lever Pull, Maximum Response

Zoom 4-piston calipers are designed for easy, responsive braking with minimal lever effort. The optimized hydraulic system requires less pulling force, reducing hand fatigue on long rides and giving you confident control with just a light squeeze.

Built for Performance & Ease of Use

✔ Quick and simple installation
✔ Low maintenance hydraulic system
✔ Reliable, consistent performance in all conditions
✔ Ideal for MTB, e-bikes, trail, and downhill riding

Whether you're navigating steep descents or riding technical terrain, Zoom 4-Piston Calipers deliver stronger stopping power, smoother control, and effortless braking performance — so you can ride harder and stop smarter.

XRT Purspeed Thumpstar Full Hydraulic Replacement Brake Caliper - Rear 1250mm