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Replacement chainrings must be chosen with a bolt-hole count and spacing that matches the spider. Chainrings designed for use with multi-chainring crank arms may have ramps or pins to aid in shifting. The middle chainring, in the case of a triple crankset, usually has the most shaping to aid in shifting up and down.
Biopace is a tradename for a type of ovoid bicycle chain ring manufactured by Shimano from 1983 to 1993 [1] [2] The design was intended to help overcome the "dead zone" where the crank arms are vertical and riders have little mechanical advantage. [3] Biopace chainrings have a reduced chainring diameter coinciding with the cranks being horizontal.
Deore XT is a mountain and touring bike groupset first introduced by Shimano in 1983. [1] It was Shimano's first mountain bike groupset, based on their existing Deore touring groupset, and it consisted of a triple-, double- or single chainring crankset, front and rear derailleurs, handlebar-mounted "finger" shifters, cantilever brakes, and large-flange hubs. [1]
A great "on road" gear ratio, for the 26″ wheel, is 42:17, approximately a 2.5:1 ratio and 64.2 gear inches for versatile tour riding. Many British enthusiasts used to tour on 27–inch–wheeled lightweights on a single fixed–gear of 69 inches before multi–speed gearing became universally popular, though this certainly made for tough work.
Osymetric is a French make of ovoid bicycle chainring which has a non-circular shape whose angle is tailored to the pedal stroke of the individual cyclist. These were designed by engineer Jean-Louis Talo who claims that this improves cycling performance.
The Lorraine 40t featured a pike nose design similar to the IS-3. It had an oscillating turret like the AMX-50. [2] The Lorraine 40t mounted a 100 mm SA47 gun fed from a drum autoloader similar to that of the AMX-50 project. The vehicle inherited the Veil Picard pneumatic tires from the Canon D’Assaut Lorraine which helped to reduce weight. [2]
It has built in semi-active radar homing (R-40R), with an inverse monopulse seeker which give the missile ability to engage targets in all-aspects and infrared homing (R-40T) versions. [ 5 ] To guarantee a kill at such high speeds in thin air, a large warhead was needed to have a sufficient blast effect.
Since its founding in the 1980s, Austrian manufacturer Diamond Aircraft Industries had concentrated on building an extensive product line. During the late 1990s, company founder and chief executive officer Christian Dries approached the design team with a concept for a twin-engined aircraft, which became the company's first multi-engined aircraft, and became the next step beyond the Diamond ...