![]() Wheel mounting surface to lower balljoint center 4. At approximately 30mm of travel the static sag measurement anti-squat is close to 100 percent. Note that anti-squat is greater than 100 percent close to the top of the travel, and steadily decreases as the suspension moves through its stroke. Lower balljoint center to spindle center 5.75″ (vertically) The material selected for suspension design components including A-arm and other mountings & platforms for the vehicle was AISI 4130 Mild Steel which embodies a good range of supportive features to be ideal for a Vehicle system. A typical plot of anti-squat expressed as a percentage of weight transfer vs. Vertical spacing between upper and lower a-arm shafts, 11.59″ (average at center of shaft) Spindle height (balljoint centers) 13.375″ Wheel mounting surface to lower balljoint center 5.25″ (horizontally) Lower balljoint center to spindle center 5.625″ (vertically) Notice that the total weights and distribution is updated. Set the centre of gravity height to 450.00. Assume that the unsprung corner weights are each 45kg and the corner weights are each 300kg. Vertical spacing between upper and lower a-arm shafts, 10.84″ (average at center of shaft) This isnt used for the basic geometry calculations, but some approximate values can be entered. Spindle height (balljoint centers) 11.875″ Wheel mounting surface to lower balljoint center 4.875″(horizontally)Ģ25/60-15 tire rolling radius 12.40″ (BFG)Assumed modified wheel offset +.5″ (7″ width)Ģ55/45-17 tire rolling radius 12.67″ (Kumho) Lower balljoint center to spindle center 2.813″ (vertically) Vertical spacing between upper and lower a-arm shafts, 10.25″ (average at center of shaft) I want to do a comparison of a stock 1955 Chevy versus a C4 Corvette (1997) to visually see the difference. Altering offset will still affect the CoG of the bike, but much less than changing the ride height.I am attempting to utilize your calculator and am puzzled as to where to edit dimensions. Sometimes it can be better to adjust the offset to achieve the desired result. You may adjust the ride height and get the rake and trail just how you want them, but in doing so you could completely screw up the bike’s centre of gravity in the process. ![]() ![]() Rake- The angle in degrees of the steering neck from the vertical. The suspension spring rate is 22 kN/m (125 lb/in.). Question: An independent front suspension of a passenger car carries a mass (sprung mass) of 454.5 kg (or an equivalent weight of 1000 Ib). The one thing to be mindful of when adjusting the ride height of your bike is the centre of gravity or CoG. Your front suspension geometry is defined by the following six variables which are defined as: Offset- Centerline of top of steering neck to centerline of top of fork tubes. 1, Calculate the following geometric parameters.(18 points) Caster. And for newer riders, a slightly more predictable and stable bike would be more adequate. Open the Macpherson Geometry Calculator or the Suspension Geometry Calculator Click so it becomes if it isn’t already. The longer you’ve ridden and the more track riding you’ve done – it’ll probably be at the racier, livelier end of the scale. Much of where you aim to land will come down to your riding experience. When setting up your bike you’re looking to find your place on this scale. Think about the handling of your bike as a scale with one end being the fastest turning machine on the road, and the other end is the epitome of stability and predictability. To decrease the trail of your bike – for faster turning and less stability – you would do the opposite of these steps. ![]() To increase the trail of your bike – for more stable handling – you can add a larger front tyre/wheel, raise the front ride height, lower the rear ride height, increase the rake angle or by decreasing the offset distance. As the yolk slides down the forks we can see how the rake and trail are altered. (ctrl-click or shift-click for multiple) Export (CSV) VSusp (vehicle suspension): Front View Suspension Geometry Calculator/Simulator. The (very crudely drawn) image above shows two bike chassis, the top as a more conservative set up, the bottom with a more extreme one. (Customary units coming soon - please use metric for now) X-axis Window Points.
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