what is the spline for the rear axle on 81 ATC 250R

[Long Live ATC]

I want to know what the spline is on a 81 Atc 250R for the rear disk brake hub

[Bren_downe]

81 R has a rear drum brake, do you have an 82R or 81 with 82 swinger?

[Long Live ATC]

I'm doing a project and I wondering what spline is on the rear disk brake hub for 82 I didn't know the 81 had drum