You can compare bike insurance policies in pretty much the same way as you compare car insurance and other types of insurance for that matter. These days, the best place to compare quotes is online. You can either visit the numerous bike insurance firms websites, enter your criteria for a quote and then document the results. Who is cheapest etc Or you can opt to use a specialist website that will take your details and then search through various insurers on your behalf. This service for the most part is automatic as these sites send to be connected to the third party insurers quote systems direct. These sites are often free but can sometimes push their partners offers a little more than the best offers. You might not necessarily get the cheapest deal by using one of these providers.
Of course, if the Internet is not your thing, you can always get the phone book out and try calling all of the firms listed under bike insurance. You can also usually find a few good options listed in the various motorcycle magazines and publications out there. Dedicated bike insurers will often advertise directly to their market via these.