Hi, mi name is Adolfo from Mexico, and I bought 4 wheels 2-5/8" plastic Yellow wheel Futaba servo hub (https://www.pololu.com/product/228).
In the wheel descriptions says that it can match with Futaba servo splines such as the continuous rotation servo Power HD AR-3606HB (https://www.pololu.com/product/2149); but I was looking for a Standard servo, so I read in the servo descriptions that if want a standard servo with same sizes, the Power HD standard servo 6001HB is the option (https://www.pololu.com/product/1056/resources).
At the end, I bought 4 Power HD Standard Servo 3001HB (https://www.pololu.com/product/1058) because in the datasheet of the three, servos the Horn gear spline specifications are the same (25T/5.80).
So my question is ¿Why the shaft of my servos can't match with the wheels if according to the datasheet the Power HD AR-3606HB, the Power HD standard servo 6001HB and the Power HD Standard Servo 3001HB have the same spec? ¿Or perhaps there is a mistake in your web site info?
I hope answers, thanks and have a good day.