well.after riding both bikes about 15 miles each over the weekend and searching these forums ive decide to get some schwabe big apples for both bikes.(the yellow one has specialized nimbus tires and are very rough riding ....my back is killing me).....im leaving the gold bike as is (except for tires.i dont ride offroad and the tires on it are really knobby)its a great speeding round town bike.very responsive and fast.actually a little more comfy than i thought.no way to mount a rack on it.but im looking at the topeak qr rack and bag....as i say i am new to all this but really have been bittin by the bug to ride as much as i can.....im 44 and out of shape but feel great after a ride.except for the sore muscles that im sure will go away after time.thanks again for all of your input.