Tire tracks can and do get just as big. Not sure why everyone things that only fire eels get big. I like the color on fire eels the best but also most people have an easier time getting tire tracks to eat. I have gone through a few fire eels before I found one willing to eat well. He is small only about 8 inches but should grow quickly with all his food intake. Eels yes get big but they also like tight spaces a lot of the time. So even if it's big it does not mean it really needs a huge tank. This does not mean your going to have the best of luck with one in a 55 gallon for life but still they will take a long while to grow and get really big. For best luck they also need a cave to live in growing out. Mine uses a pleco breeding log. You can look at mine and follow my progress in the eel area I have a thread.
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I've never seen a tyre track that has the same girth as a fire eel, but maybe I haven't looked hard enough. If you assume the specs are the same the fire eel looks nicer imo.
i own a tire track and i love him and actually both of them grow the same size i think that fire eels grow faster though but the tire track is easier to get feeding out of any eel out their in my opinion.