DT Swiss - FR 541 27.5" RimsDT SWISS FR 541 27. 5" RIMS The FR 541 aspires to end your search for the best rim. Its design enables improved impact resistance and a better pinch flat protection on previous models, to fit each rider's style and lines as well as give a trusty ride on rougher tracks. The reduced rim weight ensures riders can gain altitude without too much effort. Build this rim with care and it will reward you with resistance and lightness for a long lasting bond.