What size bmx bike would i need?

i am 14 and 165cm hight. i want to buy a bmx off the internet but not 100% sure what size

standard size is 50.8cm (20inches)
i would go with that

you would be better off to go to a bike shop and size it up there and then go back to the computer to order what you want

20" top tube to 21" top tube. Any size is cool really, you won't notice any difference when riding really. Make sure that you choose a decent bmx, shop at about 拢250 upwards, otherwise they will just break very quickly.

hope this helps

hey im about 165 too and imlooking at bmxs around the 20.6 top tube mark. bear in mind that a bmx is roughly design the same way, and once u get used to it itll jst feel right to u. its not lik a mountain bike where the size can b a bid difference. i say with bmx, go for a longer top tube if u plan on riding street, and barspins and alot of room up from for ur knees is good. short tubes would be for awsome for trail aswell as park.. more leaning towards park. then again sizing wont make a huge difference, but make sure u buy a frame made of 4130 cromoly, and NOT hi-ten steel. if u can afored cromoly frames, buy it, the difference is there, with strength and with weight. ven just a front triangle cromoly with rear hi-ten would b beter.