The nubs work great on the jammin but you have to get up the courage to drill two holes in you steering knucle 2.5mm away from the stock ones and you have to shave down the rod end alittle so it will steer lock to lock. This narrows the truck alittle and makes it respond quicker and the nubz are so light that accelleration is improved also. You can also get 15mm long 17mm hex extended hubs that will allow you to run the nubz straight up but the response gain is not as much. If nubz are hooking up at your track it's worth running them on your CRT. And I have a set with me at all times for dry hardpacked conditions.