17.5 in 1-12 scale is pretty fast. And even better when there's more the two guys racing. If there's a full heat of 17.5 there fast enough. But 13.5 is a great speed as well. Although motors are a huge part of 1-12 scale tires make the biggest difference. Size and compounds. But saying that the track has a huge part in witch tires you run. There are alot of veteran 1-12 scale drivers at the track that will deff help out with that