Smaller did exist. There are no 17" slicks made taller than 25" and they will not get enough patch to hook up. Nitto makes the 305X45X18 that is 28.78"tall and these have a chance of hooking. I am going to try a set. I have heard that they are marginal. I will have them heat cycled as that is supposed to help with long term traction. I have heared that they work well when new but traction goes away fast as they get some miles/runs. I also heard that you have to get them real hot in the burn out box for them to work good. It would be nice to get a 18X10" wrinkle wall.
Jack