Why not take both bikes. You can race LPT on either a TT or road bike. I raced there all four years we lived in Bangkok. All with a road bike outfitted with tri bars. The race starts with about 7 kilometers of flats then you start climbing over the Tiger Back, three steep hills. I almost threw up from stomach pains on the steepness. Came back the next year with easier gearing and no issues. After the climbs it's mostly flat and with curves through the rubber plantations. The highway through downtown is flat and fast. Then you head back with smaller climbs along the water and back into the resort area. Beautiful, hot, humid, and fun race. You can also get to races in Vietnam, Singapore, Bintan (an island off of Singapore in Indonesia), Taiwan, and elsewhere. There's lots of great races over in OZ if you can travel there.
In Thailand, there are lots of motorbikes so be careful, very careful of traffic. I developed bike handling skills that I didn't know were needed but came in handy. (I never raced in bike road races so never learned those skills until there). Also consider a highbred or mountain bike, or even a cruiser. Comes in handy getting around. Also, you might to do some recreational biking in Up Country (the Northern region of Thailand), or in Laos, Cambodia, Vietnam or elsewhere. Thai food is awesome. Some great bike riding in Khoa Yai in the mountains north of Bangkok. The culture is different in Phuket and the southern part of Thailand compared to the rest of the country. Sawaddi Khup.
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