A bicycle rim includes first and second annular side portions, an annular bridge portion and an annular seal member. The blocking structure is adapted to prevent minority carriers generated within the adjacent contact structure from reaching the absorption region, and may also prevent minority carriers generated within the absorption region near the contact structure from entering the contact structure. Second group nozzles inject combustion gas in opposite directions along a second axis. In essence, by reversing the order of the coefficients, the Chien search processes the terms in descending order which is the right direction for Horner evaluation.