Aother thing to consider when purchasing a new rotor. The stock R100gs rotor is stainless steel. Although it stays nice and shiny and will probably outlast the bike, SS has a very low coeficient of friction. This is one of the reasons the R100 has such lousy brakes, apart from the small rotor and small caliper. The best rotors are made of ductile iron, they stop you like crazy!! These are used on race cars ad GP bikes. If your retrofitting, you can get some great brake systems from KTM Racing. I went with a 310mm ductile iron wave rotor and Berringer four-pot caliper. I use a stock BMW 12mm master cylinder. I can actually lift the back wheel off the ground with two fingers! The advantage of the wave rotor is it equals the surface area of the rotor from the bottom of the brake pad to the top, so your pads wear evenly and actually last longer. All this wasnot an easy task though...i had to build a custom tripple-clamp and mounted a set of WP4860 forks from a KTM. They had to be shortened by 4 1/2" and re-sprung, basicly the same forks you find on the 950. You can find them an e-bay for $500, another $400 to get them re-worked and shortened..and in the end WELL worth the effort!!
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