Bicycle Tours in Thailand.

 Baja Bikes
Baja Bikes offers bike tours in 45 cities, including Bangkok. In approximately 3 hours we show the city in a safe and informative way. This is a most fun way to explore Bangkok.
http://www.bajabikes.eu/en/bike-tour-bangkok

 Sport Bicycle
Sport Bicycle has mountain bikes and road bikes. Brands : Specialized, Colnago, Zipp, Free Agent. Impressive large showroom at U-Chu Liang Building (Rama IV road between Silom and Sathorn) and also at Onnuj.
http://www.sportbicycle.co.th/

 Grasshopper Adventures
Grasshopper Adventures organizes different types of bicycling tours in Thailand, Cambodia and the Mekong area. Adventure tours, classic bike tours, mountain biking, trekking etc.
http://www.grasshopperadventures.com/

 Bike & Travel
Bike & Travel is a Thai cycling tour operator based in Bangkok since 1995. Specialized in bike adventures in all regions of Thailand and the Mekong countries.
http://www.cyclingthailand.com/

 Siam Bike Tours, Phuket
Siam Bike Tours Co. Ltd. is a bike tours operator, based in Phuket at Kata Beach. We offer guided cycling tours across Thailand : multi-day tours from Bangkok to Phuket, Chiang Mai to Bangkok, and many more. Rental road bikes are also available for our customers.
http://www.siambiketours.com/

 Recreational Bangkok Biking Ltd.
RBB (Recreational Bangkok Biking) is specialized in developing and executing of recreational cycling tours. Groups are never bigger than 8 participants and can so enjoy a more personal service. Every adult that is able to ride and balance a bicycle can join our excursions. Programs in Bangkok and Chiang Mai.
http://www.bangkokbiking.com/

 Co Van Kessel Bangkok Tours
Co van Kessel Bangkok Tours offers bicycle tours and walking tours, starting at the Grand China Princess Hotel. Tours can cover Chinatown, and the unlikely and almost unknown green area of Bangkok (other side of the Chao Phraya river).
http://www.covankessel.com/

 M.T. Hill - Mountain Bike Tours, Bangkok
M.T. Hill Tours specializes in professional mountain bike adventure tours to suit all off-road cycling fans. All-mountain cycling, singletrack, cross country mountain biking and some nice downhill descents.
http://www.mountainbiketoursthailand.com/

 Bangkok Bike Rides
Bangkok Bike Rides' tours explore the green areas surrounding Bangkok. We discover floating markets, pottery villages, local industries, rice fields, vineyards, mountains, klongs (waterways) and Thai villages.
http://www.bangkokbikerides.com/

 LA Bicycle, Nakhon Pathom
LA Bicycle produces a whole range of bicycles : BMX bicycles, full suspension and hard tail bicycles, city bikes (for women), bicycles for children. Also a variety of electrically powered bicycles and go karts. List of shops in Bangkok and around Thailand. LA Bicycle produces under its own brand name, and accepts original equipment orders. Export-oriented.
http://www.la-bicycle.com/

 ProBike Co. Ltd.
Probike has its main showroom on Sarasin Road (adjacent to Lumphini Park). The entry page of the website is in Thai language. However, you will find a lot of information in English on available mountain bikes, road and city bikes, and race bikes.
http://www.probike.co.th/

 Northern Trails, Chiang Mai
Cycling and biking in Thailand, Cambodia and Laos. Fully supported tours starting from Thailand's Northern Capital, Chiang Mai. Northern Thailand still offers the best trips, as we mix comfort, great trails and excellent food.
http://www.northerntrails.com/

 Bicycle Thailand
Bicycle Thailand is a top resource for anything related to cycling : where to find a bike shop, which cycling tours are available, where to have your bike repaired, bicycling blogs and websites.
http://www.bicyclethailand.com/

 Go Bangkok Tours
Located right next to the Saphan Taksin BTS station, Go Bangkok Tours offers GPS guided bicycle tours. Small groups of up to 6 people max for the best experience. Bicycle rentals.
http://www.gobangkoktours.com/

 SpiceRoad Cycle Tours
SpiceRoad has offices in Bangkok and Chiang Mai. Wide range of tours from day trips to two-week journeys across multiple countries.
http://www.spiceroads.com/

 Vincita Co. Ltd.
Starting as an original equipped manufacturer (OEM) Vincita now having its own bicycle bag brand. Handlebar, toptube, frame, saddle bags. Panniers, rack bag, transport bags for folding bikes, accessories,etc. Dealers in Bangkok, and online shopping.
http://www.vincita.co.th/

 Piriya International
Piriya International distributes and wholesells the following bicycle brands : Rocky Mountain, Polygon, Salsa, VooDoo, Surly, Race Face, Fulcrum, Selle Royal, fi'zi:k and 12 O'clock. Located Ladprao, Bangkok.
http://www.piriya-international.com/

 Tour de Thailand
Tour de Thailand is a charity cycling event, starts in Chiang Mai and ends in Phuket.
http://www.tourdethailand.com/

 Mountain Biking Chiang Mai
Chiang Mai Mountain Biking, specializing in off road downhill Mountain Biking. High quality mountain bikes, all equipment such as knee pads, elbow pads, helmets, gloves, eyewear and cycling top.
http://www.mountainbikingchiangmai.com/

 Click and Travel Ltd.
Click and Travel Ltd. organizes bicycle tours in Chiang Mai and Northern Thailand. Our bicycle tours range from a half-day tour to a two-week cycling holiday.
http://www.clickandtravelonline.com/