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Motorbike frames2/1/2024 However the offset rear wheel which is now in addition not parallel to the frame centre line will cause a steering bias which leads to instability. If a rear wheel is offset to the frame centre line due to inaccurate manufacture and or assembly and is angled within the swinging-arm then rear to front wheel alignment is achievable. This produces the same symptoms as worn swinging-arm pivot bearings and creates variable front to rear wheel misalignment and therefore instability as the motorcycle is ridden.Īligning the front and rear wheels to each other is no guarantee that either wheel is aligned to the frame centre line. When this is not at 90 degrees (perpendicular) to the steering head axis as the swinging arm moves up and down the rear wheel will move side to side across, instead of moving in line with and parallel to, the frame centre line. The situation worsens as road speed and bump frequency increases and in extreme circumstances leads to total loss of control (tank slappers). The riders grip on the handlebars reduces the effectiveness of the front wheel trail and leads to instability. Transporting motorbikes on trains in Thailand costs 1,200 to around. Double cradle frame used in Hero Splendor Plus. BMX Bikes, Frames & Parts - Performance Bicycle Popular Products by Fit Bike Co. The example of such frame used in a motorcycle are Hero Splendor Plus and Royal Enfield Continental GT 535. It has a good balance among strength, rigidity and lightness. A rolling chassis which is not in alignment will create a steering bias which means the rider has to hold the handlebars in a position to counter the steering bias. Commonly used in simpler road motorcycles & many custom motorcycles as well. When the motorcycle is in motion the trail brings the front wheel back into the centre position as the wheel is deflected to the left or right by stones and bumps in the road surface. This is defined as the distance from the tyre contact patch centre to an imaginary line from the steering head axis extended to a point on the ground. From these datums I can establish to a high degree of accuracy the relative position of for example, the rear wheel centre line to the frame centre line and the swinging arm spindle axis to the steering head axis. Because in conjunction with parallel engineering blocks they provide fixed horizontal and vertical surfaces to use as datums.
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