I'm thinking of getting Panaracer Fire XC Pro (2.1) for my 2004 Stumpjumper FSR Pro. I currently have the stock tires (Specialized Rollx Pro (2.0) Will the wider Panaracer's be nicer on my stumpjumper. I'm looking to have more control on my downhills and a little more grip on the uphills. Are these the tires for me. Do i need to get new tubes to fit them, or can i just use the tubes i've got on my old tires?