Link Wheel

Link wheel is a set of connected websites which are linked to a targeted website thus forming a wheel like structure. It is one of the useful tactics of seo which builds quality back links in turn helps to get huge traffic to your site. The wheel consists of unique web 2.0 sites like Squidoo, blogger, wordpress, etc.
The below figure represents link wheel formed by few of web 2.0 sites with Page rank 3 to 9.
 

In the above link wheel figure, Squidoo, blogger, wordpress, weebly, facebook, vox are some of the web2.0 sites. All these unique web2.0 sites are linked to one another and finally to main site i.e., your site in this figure.

Link wheel is a method of creating a new blog with few of web 2.0 sites on specific topics with targeted keywords. On these sites, one can create articles of their own and upload them. The content of the article should be unique with limited words up to 200. The content should link to one of the web 2.0 sites and also include one link to your site. Like-wise upload few articles to web 2.0 sites and make sure that one link should be connected to adjacent website with targeted keywords and one link to main web site. i.e. your site. Thus forming a structure called "Link Wheel".

The content should be user readable so that your site can attract huge traffic. The effectiveness of a link wheel depends on the number of quality backlinks from the sites.
Link wheel improves page rank of your site in search engines with quality back links from unique web sites. Link wheel creates good visibility with the unique and fresh posts on web 2.0 sites. Thus the publicity of your site increases by huge traffic and page rank gets improved in search engines.