HELP PLEASE ITS GOT ME STUMPED

[king 62]

stuffed if i know, iv'e got a weird noise, it sounds like it's coming from the front end but you know how sound is decieving it almost sounds like something stuck in the tyre and hitting the gaurd or something in the centre hub like a stone rattling so i lifted the front wheel and span it around and checked it out - no stones not even a rubbing noise, next i checked the fan - nothing obstructing and it runs freely so i then tried the back end - runs freely and no unusuall noises it comes and goes this noise but mostly comes! the noise is definately not the motor - still sounds like the front end somewhere so if anyone has any other ideas i can check out because i'm pulling my hair out.

cheers,
stressed King 62