Gomadic Bike Handlebar Holder Mount System suitable for the Magellan Maestro 3140 - Unique Holder, Lifetime Warranty Perfect for bikes (street or mountain) and also works great on motorcycles, ATV, 4-wheelers, golf carts, baby strollers, snowmobiles and more! Cradle attaches to handle bars of any bike with tube diameters ranging from 1/2 - 1 1/8 inch (13-28mm). Unique rubber ribbed clamping system connects without the need of tools. Bike handlebar mounted base for the Magellan Maestro 3140 device. Cradle is designed to accommodate the specific dimensions (109.3 x 88.4 x 29 mm). Heavy duty foam inserts (1/2 inch thick) line grips on holder for a secure hold of device under a variety of riding conditions. Simple operation. Quickly, safely and securely installs in minutes.