I'll try and sum up some answers that I've seen from other vloggers to this question;
Don't focus on your sub count.  Vlog for your own enjoyment and the subs will come.  It will take time but if you obsess about your subscriber count and it doesn't rise quickly enough for you then you'll get disheartened .
Separate your non-bike related videos from your bike ones on your YT page.
Get involved in the forum so people get to know you.
Post a comment on the video upload page letting people know when you've got a new video.  Include a link to the video, not just your YT page, and give a brief description about your video's topic.
Some people get hundreds of subs in a few months, others (like you and me) take longer.  Just because someone has lots of subs it doesn't mean all those people still watch the videos.  So get people on this site viewing your vlogs and your sub count will rise.
I've only got 40 subs, but the more vlogging I do then the better I'll get and more people will want to sub.
p.s.  I've subbed you (though that shouldn't matter, now that you know not to worry about it)  
