If you have a 121" track... and you are putting them on the Trail, I would recommend you use at least 96 studs, but no more than 120. Any more than 120... say 144 would get to be a lot of weight to move for your 55 horse motor.doomsday said:What IYHO is the best studs/lugs? Both company and size wise. Also, is there a set amount of studs you should use? Like for every foot of track should you use so mant studs/lugs or what?