Hi there. I am still quite new to mountain biking and would like some advice. I bought a new 2011 Specialized Rockhopper SL Pro from a bike shop, but got the fork changed from the Recon Silver to a 2012 SID XX. I was wondering if the stock handlebars are not too wide for XC (might eventually do some races). The bars are 720 mm, Butted alloy riserbar, 25mm rise, 8 degree back sweep, 6 degree up. Should I trim them or change to narrower bars. Thanks