Promax QR-1 Quick Release Seatpost Clamp 34.9mm Silver Size:34.9mm New patent pending Speedfil Z4

New patent pending Speedfil Z4 Cage is the first cage optimized for BTA (Between-The-Arms) aero hydration

Shifter Style: Twist

These shapes are tubes we’ve used on other models that we know to have various qualities—aerodynamic

This is made possible by an additional

Promax QR-1 Quick Release Seatpost Clamp 34.9mm Silver Size:34.9mm New patent pending Speedfil Z4QR 1 seatpost clamps are cold forged and CNC machined from 6061 T6 aluminum alloy. The QR 1, as the name implies, has a quick release lever, making seat height adjustments a snap. Weighing just 30 grams 1. 1 ounces in the 31. 8 size, its as lightweight as it is tough. The head of the lever and the face of the clamp are given a proprietary low friction surface treatment that ensures smooth lever action for the life of the clamp without the need for a