This makes absolute sense as there is no shock wave to speak of at subsonic speeds. Bumping the fork travel up by 20mm, to 150mm, will slacken the head angle by approximately 1° and increase the front centre measurement by 10mm. NO. Traveling at the speed of sound makes the ratio equal one and results in a Mach angle of ninety degrees. This covers everything from cross-country race machines to hard-hitting enduro bikes. Trophy Trucks travel across the desert at speeds exceeding 130 mph. -1/3 to 2/3 of the shock should be up travel.-Do not exceed 9″ of droop.-14″ shocks are most common, then 12’s, then 16’s.-It may be necessary to adjust ride height and repeat this process a few times.-If you want more than 16″ of travel consider a Trailing Arm Suspension design.-18″ coilovers offer very few spring choices. For a given Mach number, M 1, and corner angle, θ, the oblique shock angle, β, and the downstream Mach number, M 2, can be calculated.Unlike after a normal shock where M 2 must always be less than 1, in oblique shock M 2 can be supersonic (weak shock wave) or subsonic (strong shock wave). In my thinking this simply increases the amount of mechanical leverage the control arm has on the shock. The shock angle depends in a complex way on the free stream Mach number and the wedge angle. Trevor says it all comes down to piston velocity. Also as motion ratio goes up wheel rate goes down. Your UTV or tube-chassis race truck … The suspension design is crucial in the development of vehicle behavior to ... (toe out) is defined as a wheel splaying out from the direction of travel. Running tires up to 42-inches tall, they have solid axles in the rear with trailing arms and a wishbone. Most modern mountain bikes will have somewhere between 100mm and 170mm of suspension travel. So, suspension travel will be the focus here. In my situation I get the greatest amount of wheel travel and motion ratio by placing the lower shock mount further inboard. * A 2:1 ratio, would be the shock placed exactly halfway between the front pivot point of the lower arm, and the rear end. So what makes an on-road shock different from an off-road one? * A 1:1 ratio is the shock on top of the rear axle bumped at 90 degrees. Most street driven vehicles should have a minimum of 2.5" to 3" of compression travel at the wheel and 2" to 2.5" of rebound travel … A Trophy Truck’s suspension is designed for maximum suspension travel and most are able to travel as much as 36 to 40-inches. “The street shock will typically see shaft velocities of up to 40 inches/second. Suspension 101The suspension on your car has two main functions.Its first job is to smooth the ride of your car. At transonic speeds the shock wave is a wall of high pressure moving with the object, perpendicular to its velocity. So knowing the Mach number and the wedge angle, we can determine all the conditions associated with the oblique shock. Street vs. Off-Road. The equations describing oblique shocks were published in NACA report in 1951. * It is not referencing wheel travel vs. shaft travel. Toe Angle carries the same sign as Toe Distance. There will also be an associated increase in BB height, so if the bike already has a relatively high BB, it’s probably better to use an angle-adjust headset or offset shock bushings. The amount of shock travel needed depends on the type of suspension you are working with (solid axle, or independent) so it is best to consider wheel travel as well. The angle of shocks is largely to do with packaging and tire size, but most manufacturers prefer to see the shocks mounted straight up and down in hardcore drag racing applications. 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