Motorbicycling.com
Offers the latest information, guides and tips for motorized bicycle engines.
http://motorbicycling.com/

Philippine Mountain Biking Community (PMTB)
A cyclist's and mountain biker's online community forum. Covering mountainbike and cycling topics, news, trends, events, pictures, videos, bike trail, ride (fun/race) scheds, product reviews, bike commuting and advocacy rides.
http://www.pinoymtbiker.org/