Does the frequency of the tick change if you go faster or slower? My first guess would be the brake pads moving around, which is normal. I'd suggest putting your foot lightly on the brakes and see if the noise goes away. If it does then there's not really anything to worry about, if it's annoying then you can put some brake quiet on the pad backing to try and hold the pads in place better.
If the noise is still there even with pressure on the brakes then I'm not sure what else it could be, one of those things that's hard to diagnose without being there or being able to hear the noise itself.
If the noise is still there even with pressure on the brakes then I'm not sure what else it could be, one of those things that's hard to diagnose without being there or being able to hear the noise itself.