You probally tightned your springs too tight. they need aobut 8-10 psi, also could be that your cable needs relacin' or.... Pull the cable out and run some WD-40 through it and jack it away 10 or 5 minutes and get all the rust and shicaca out of it.... Maybe you put it together wrong. www.bikebandit.com and there go to "oem parts" and look up your mihkro-Fijsh