I'm guessing you mean "radial" brake levers and not the '80's Yamaha 600cc bike Radian?
If so, the premise behind them are greater control, feel and accuracy of your breaking. Greater force applied to the rotors by the pads with less force from your hand. They also cost anywhere from $100 and up MORE THAN a regular lever.
It's very easy to tell them apart visually so I needn't go into that here.
If it's braking ability you're after with your bike I would suggest quality pads and lots of practice first then when you're ready for the speeds required to get the benefit of a radial mount brake set up look into it then. From Todd Robinson (Cal-Sportbike and the TrackXperience riding school)
The difference is not in the brake lever per se, rather it's a design of a master cylinder, and the lever is integrated into the unit. Note the pic below, where the plunger goes directly into the piston (usually 16-19mm bore) and connects to the lever about 18-20mm from the pivot point. As stated above, a radial master cylinder is not the first modification that should be done. The biggest night-and-day difference is braided stainless lines coupled with good HH (sintered) brake pads and high temp (like Motul 5.1) brake fluid. But the next step, before calipers and rotors (in most cases) should be a radial master cylinder. We suggest 19x18 for most sportbikes with 4 pistons, 19x20 for 6-piston calipers, and 16x18 for Ducati or single caliper applications.
http://www.calsportbike.com/images/product/brembo_mc.jpg
degree and radian are juest unit measurment of angle
pi radian
Degree measure is based off of a division of 360 degrees in a circle. Radian measure is based off of a division of 2PI in a full circle.
A radian is simply a measurement unit. The relation between a radian and real numbers is similar to the relation between a degree and real numbers or a metre and real numbers.
There is no relationship between electric charge and a radian which is an angular measurement.
They are different measures of angular displacement.n degrees = n*tau/360 (or n*pi/180) radians.
The radian is 0.523598776
From the Wikipedia article about the radian: "The unit was formerly a SI supplementary unit, but this category was abolished in 1995 and the radian is now considered a SI derived unit." The radian can be derived as the ratio between two lengths. That makes it a dimensionless unit.
1 degree = pi*radian/180 So therefore 15 times pi*radian/180 = pi*radian/12
Radian - Morituri - was created in 1986.
You cannot. A foot is a linear measure of displacement whereas a radian measures angular displacement. The two measure different characteristics and conversion between the two is not valid.
A radian is an arc of the circumference of a circle and it is about 57.3 degrees.