Greenspeed: Greater Stability with Big Wheels
Normally trikes with large rear wheels are unstable due to problems with rear wheel flex and rear end instability. Thus we have made special GS rear hubs with a much wider flange spacing than normal, which has resulted in a 26” wheel with more lateral stiffness than a 20” wheel! Plus we have increased the section size of the rear forks. Thus with the longer wheelbase, the Magnum BW is even more stable at high speed than the Magnum SD.
For people who want even larger wheels than 26”, the Magnum BW frame has been built to accept a 29 inch rear wheel. Plus the rear forks are wide enough to accept a 4 inch wide tyre, and 4” wide wheels may be fitted, with 20 x 4 on the front, and 24 x 4 on the rear, for use on sand. For use on sand we recommend the use of an internally geared hub like the Nu Vinci or the Rohloff, and the frame is fitted with Rohloff OEM dropouts and extra cable guides.
Special 90mm Q/R Drum Brakes
Many trikes use disk brakes. However, most disk brakes are fiddly to adjust, the rotor can easily get bent, and the pads can have a short life, plus it can be difficult to remove the wheel. Thus the Magnum BW has special 90 mm drum brakes. These may take some time to bed in and give their best performance, but the shoe size is much larger than the pads used in disk brakes, making them practically everlasting, and performance is 30% better than the standard 70 mm drums. We are also using a push button quick release axle, allowing front wheel removal in less than one second! The drums also give a cleaner appearance than the disks.
Superb Steering System
Some trikes use what they call direct steering, in which the handle bars are merely extensions of the kingpins. This is done because it is cheap, with no extra linkage except for the track rod. However, this usually results having the arms out stretched in uncomfortable and awkward manner, or at the best, having the use the weaker muscles of the arms to move the handle bars sideways, rather than using the biceps in a fore and aft motion. The Magnum BW uses the GreenSpeed “Cross Over” steering system, for easy and superior control, and unlike conventional “indirect” steering systems, which have a larger turning circle, the Magnum BW has a tiny turning circle for its size, making it extremely manoeuvrable. Plus the Magnums use NSR steering geometry, 1st introduced on the Series II GT3s, in which the steering automatically corrects if you use only use one front brake. The 5 degrees of negative camber increases the stability of the trike and reduce the overall width, making it easy to steer through bollards, gateposts or doorposts, and ensuring that the tire rather than the axle end will touch them if you happen to get too close.
As the steering is light, it works well for people with the use of only one arm, like stroke survivors, as all the controls can be fitted on one side.
On the Beach
For people who want even larger wheels than 26”, the Magnum BW frame has been built to accept a 29-inch rear wheel. Plus, the rear forks are wide enough to accept a 4-inch wide tyre, and 4” wide wheels may be fitted, with 20 x 4 on the front, and 24 x 4 on the rear, for use on sand. For use on sand we recommend the use of an internally geared hub like the Nu Vinci or the Rohloff, and the frame is fitted with Rohloff OEM dropouts and extra cable guides.