I always wondered what the stock roller weights in my Ditech Scooter weighed...so I put them on a scale today. Since my roller weights had previously been drilled with a 5/16 inch drill, all I can say for sure is that the drilled weights I have weigh about 9 gms! That sure is a hell of alot more than the aftermarket weights on the forum (6-6.5 gms)! I drilled mine a second time with a 1/2 inch drill and got the weight down to 7.5 gm and the hill climing ability is much improved. I used to have the scooter struggle to maintain 25 mph on the road to my house (a long, steep grade), but this time on the test drive I maintained 35 mph! Considering the speed limit is 25 mph I would say that is adequate, but I am still wondering now about those 6 gm weights. May have to try them!