jrrxm 12v 550 40000rpm high speed steel gears motor gearbox for power wheels motor upgrade,12 volt electric hubs motor assembly heavy duty gearbox for kids ride on toys car replacement parts 12v rs550 40000rpm is up for auction in Automotive. The current bid is $1.00, 96% below the $26.69 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.