One key difference is the way the ball bearing race track is formed.
													
																	Nylon garage door rollers ball bearing 7 stem 10 pack. 
									
																	Because some doors are constructed with a double bracket double hinge setup there is also a need for longer 7 and 9 inch stems. 
																	The old 13 ball roller was rated for max 75 lb load sections and 15 000 cycles. 
																	Xike 10 pack blue 2 nylon garage door roller 7 stem quiet durable and high load use 6200 2rs double seals precision bearings. 
																	These longer stems extend through 2 brackets or 2 hinges to support the weight of the door and help mitigate any horizontal movement on the door. 
															
													
									
																	The standard residential garage roller stem length is 4 inches. 
																	Dura lift ultra life 2 reinforced 6200z bearing nylon garage door roller and 4 stem 10 pack 4 8 out of 5 stars 127 xike 10 pack blue 2 nylon garage door roller 7 stem quiet durable and high load use 6200 2rs double seals precision bearings. 
																	The roller which looks like a wheel is very hard plastic but with a bit of a rubbery feel. 
																	99 xike 10 pack 2 in nylon garage door roller use 6200zz shield bearing rotate quiet and durable 4 in stem and reuse more than 100 000 cycles blue. 
															
													
									
																	75lbs per roller 50 000 cycles please note. 
																	The dura lift ultra life max 2 inch nylon garage door roller with 7 inch stem is the ultimate garage door roller for your heavy glass or wooden garage and or. 
																	4 9 out of 5 stars 587. 
																	They are rated at 200 000 open and close cycles for a 110 lb. 
															
													
									
																	7 16 11 13 ball bearing rating. 
																	The new 11 ball roller is also rated for max 75 lb sections but passed 50 000 cycles.