* A 2:1 ratio, would be the shock placed exactly halfway between the front pivot point of the lower arm, and the rear end. I am trying to determine the most optimal coil-over angle. Suspension 101The suspension on your car has two main functions.Its first job is to smooth the ride of your car. So, suspension travel will be the focus here. Toe Angle carries the same sign as Toe Distance. 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 … At transonic speeds the shock wave is a wall of high pressure moving with the object, perpendicular to its velocity. “The street shock will typically see shaft velocities of up to 40 inches/second. So knowing the Mach number and the wedge angle, we can determine all the conditions associated with the oblique shock. In my thinking this simply increases the amount of mechanical leverage the control arm has on the shock. In my situation I get the greatest amount of wheel travel and motion ratio by placing the lower shock mount further inboard. NO. This makes absolute sense as there is no shock wave to speak of at subsonic speeds. The equations describing oblique shocks were published in NACA report in 1951. 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). Most modern mountain bikes will have somewhere between 100mm and 170mm of suspension travel. * It is not referencing wheel travel vs. shaft travel. 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. Running tires up to 42-inches tall, they have solid axles in the rear with trailing arms and a wishbone. 1:1, 1.5:1 and so one are referring to the leverage ratio that the arm has over the shock. 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. A Trophy Truck’s suspension is designed for maximum suspension travel and most are able to travel as much as 36 to 40-inches. Street vs. Off-Road. Traveling at the speed of sound makes the ratio equal one and results in a Mach angle of ninety degrees. According to Mr. Newton and … Your UTV or tube-chassis race truck … 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. Trophy Trucks travel across the desert at speeds exceeding 130 mph. Other specs such as geometry, wheels, and tires contribute too, but they usually are tailored to match bike travel. The shock angle depends in a complex way on the free stream Mach number and the wedge angle. Also as motion ratio goes up wheel rate goes down. So what makes an on-road shock different from an off-road one? 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. * A 1:1 ratio is the shock on top of the rear axle bumped at 90 degrees. This covers everything from cross-country race machines to hard-hitting enduro bikes. -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. 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