Not sure why you would want to change the derailleurs? The bike comes with adequate deraileurs. Its not a bike for fast paced riding. I ride 100% rail trails that have mostly packed limestone/limestone dust, and some asphalt. Not sure your intentions for the bike, but unless you are riding gravel or rougher surfaces the first thing I would get rid of are the 45mm tires. I hated the stock tires it came with. Other than that, you are not going to find much difference in different derailleurs unless the ones on the bike are not working right. If its not shifting right most likely the cable tension for the derailleurs just needs adjusted. If its just better deraileurs you want. I'd save my money and get a different bike with better derailelurs.