Its going to depend on who the manufacturer is. Some are short, long, fat, skinny and whatnot.
I found that the DYnamite big bores were MUCH more adjustable on the fly than the Traxxas big bores. Which would be ideal for going from the track to the bash session. However, they have a shorter throw.
As far as the Traxxas ones, (which I run), the Outer diameter was actually smaller than the stock standards. BUT, the inner diameter was bigger and deeper. The thing with these, you will have to install the spacers on the shafts if you want to lower them for track. Which if you track and bash all in one week, this can make things cumbersome.
I will probably be picking up another set of Dynamites just for adjustability.
I will keep you posted.