Superstreets

good question.

I just measured a half circle ( 4 pcs )

16 3/4" out side to outside.

inside to inside is 12"

14.5" c to c

But to answer your question,

it's none of the above....

Check outside rail to outside rail.

 15 3/4" ....

 Maybe it's like lumber...They cheat....

I think your 16 3/4"s is to outside of the road bed.

Did you measure from the outside of the outside rail to the outside of the outside rail........... and hold your tongue against the roof of you mouth?

Yup ..

outside rail to outside rail is 15 3/4"

outside of track to outside of track is 16 3/4"

I can't type when I hold my tongue like that.....

I think they just round it to 16 inches.  Do you really want to talk about "fifteen and three quarters inch curves?"

When all I have is 15" to work with, Yes...

The original poster did not specify why he wanted to know.

The best way is to get the design software and play with it.

All the dimentions are there.

I believe K-line offered a free version, it's on my machine someplace.

I just bought a 16" circle of K-LINE super streets. It is 16 3/4" outside to outside. HOW DO I WIRE THIS TRACK? I bought the hook-up wire. I will attach photo of underside of my track. This is NOT the Lionel setup with two metal strips underneath.

Only the straights have the 2 tabs for hookups.

Thank you!