Bicycle Tours in Thailand.

 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/

 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/

 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/

 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/

 Pro Cycle Co. Ltd
Pro Cycle is an importer of bicycles and accessories. Among available brands are Pinarello and Focus. Head office at Rama 3 Road. MANY dealers around Bangkok and Thailand.
http://www.procycle.co.th/

 Nich Cycling Co. Ltd.
NICH Cycling is a Thai bicycle company that offers professional-level road racing equipment such as carbon bicycle frames and carbon ra cing wheels. Available in Singapore, Malaysia, Australia, Mexico ! Headquarters in Thailand at Lat Krabang road. Online orders possible.
https://www.nichcycling.com/

 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

 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/