Bikercoin is a new currency (released on June 7th 2016) based on the CryptoNote protocol.
What are the major differences between Bikercoin and Monero? What source code are they forking from?
Since this is a Monero stack exchange I'm not going to go too deep into what differentiates Bikercoin from Monero. However, a quick examination of their listed GitHub repository indicates that it is indeed a fork from CryptoNote.
The commit history indicates a substantial number of adjustments (including change donation) and there are currently no pull requests in place which indicate a largely solo or small team effort.
Given the overall level of activity and network effect on the back end it seems prudent to dismiss this as a simple alt-coin that doesn't add much value to the Monero ecosystem.