I was thinking about taking the plunge this year and trying a local race at ttown...but I don't have a thouroughbred trackbike..I have a fixed-gear road bike convert. I checked their website to see if such bikes were permitted or if the BB height would be an issue but found no such info. Does anyone know? or should I just go to the TTown flea market in april and hope I can find a cheap track frame

i think in order to race you have to be licensed. unfortunately i'm a little unclear as to how many different ways there are for one to get licensed for a t-town race. the only way i know of is to take the airproducts class on track racing. the upper level course gives you your license and requires you to make a friday night race appearance. the class has an army of different sized fully maintained serotta track bikes at your disposal and i'm pretty sure that they let you race on them. so acquiring a new bike won't be an issue. i was able to take a class at the velodrome through my university about four years ago. it was friggin' rad! college credit for riding around in circles really fast on a bike i couldn't afford.

https://www.lvvelo.org/ap.htm
i believe you'd qualify for the adult level two class. there's contact info on the bottom of the page. let me know what you find out. maybe i'll see you there since the price is right... free free free.

they give out the bikes so you should have no problems, just take your own pedals, and maybe your seat if you are very particular and they let you swap it for the night. Ride a few bikes to see what fits you best, then go to T-town and but one of your own. Don't look back. ! I did the same as you, now I race track every Wed night, it's a great buzz.