I ride a '07 prophet 4 and noticed the rear hub shimano 475, same as the 5 and 6, didn't come with an outter dust/dirt seal. I thought maybe the wheel was put together on a fri. evening or monday morning, so I swiped one from my bike on my trainer, it doesn't fit well but does the job, untill my lbs can get the right one in. I posted this because I met up with a girl on a prophet 5 on the trail and was looking over her bike, the blue and black color scheme is awesome, and noticed her bike didn't come with one either...so if you are riding one of these check it out, on the disc side you will see either a rubber seal or a greasy peice of metal...