A key feature on the new XSR900 is the use of an all-new compact and lightweight aluminium frame that uses the very latest manufacturing processes to make this one of the slimmest, lightest and most compact designs in the class.
Longitudinal, lateral and torsional rigidity are all significantly increased, resulting in better straight line stability together without affecting agility, and the head pipe is located 30 mm lower than the previous model for increased feeling when cornering. This allows the handlebars to be mounted lower to give the XSR900 a more aggressive stance, and combined with other changes to the chassis there is a 14% reduction in inertia around the steering axis compared to the previous model – enabling the rider to corner quickly, accurately and confidently.
The new Deltabox-style frame has been manufactured using Yamaha’s latest Controlled Filling (CF) technology that accurately controls a number of factors including mould vacuum, temperature and injection speed.
This sophisticated Yamaha-exclusive technology makes it possible to produce complex die-cast structures that can be made lighter and stronger than by using conventional casting methods. The frame utilises sections of different thicknesses so that the rigidity level is designed to match the varying loads experienced at any specific area. Wall thickness varies from 1.7 mm at its thinnest to 3.5 mm at its thickest, and this “tuned rigidity” transmits excellent feel and feedback to the rider, giving the XSR900 a sporty and responsive handling character.
Straight line stability is also enhanced by the fitment of a box-section aluminium swingarm that is 55 mm longer than the previous model to give a 1,495 mm wheelbase – and an all-new model-specific subframe is featured. Together with the longer swingarm this new subframe emphasises the XSR900’s 80s influenced styling and low-set silhouette, plus new passenger footrests that fold away close to the subframe reinforcing the clean lines of this high-tech sport heritage bike.