Shimano Specifications

Dura-Ace Ultegra 105SC RX100 RSX 300EX

Feature HB-7700 HB-6500 HB-1056 HB-A551 HB-A410 HB-HG50

Spoke Holes 24, 28, 32, 36 28, 32, 36 32, 36 32, 36 32, 36 32, 36

Hole PCD (mm) 38 38 38 38 38 38

O.L.D. (mm) 100 100 100 100 100 100

Axle QR X X X X X X

Axle Length 108mm (11mm/alloy) 108mm (M9) 108mm 108mm 108mm 108mm

Seal Labyrinth Double contact Single contact Single contact Single contact Single contact

Hub Shell Aluminum /Anodized Aluminum /Anodized Aluminum /Anodized Mirror/Polished Machined Machined

Quick Release lever Aluminum Aluminum Steel Steel Steel Steel

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	Dura-Ace	Ultegra	105SC	RX100	RSX	300EX
Feature	HB-7700	HB-6500	HB-1056	HB-A551	HB-A410	HB-HG50
Spoke Holes	24, 28, 32, 36	28, 32, 36	32, 36	32, 36	32, 36	32, 36
Hole PCD (mm)	38	38	38	38	38	38
O.L.D. (mm)	100	100	100	100	100	100
Axle QR	X	X	X	X	X	X
Axle Length	108mm (11mm/alloy)	108mm (M9)	108mm	108mm	108mm	108mm
Seal	Labyrinth	Double contact	Single contact	Single contact	Single contact	Single contact
Hub Shell	Aluminum /Anodized	Aluminum /Anodized	Aluminum /Anodized	Mirror/Polished	Machined	Machined
Quick Release lever	Aluminum	Aluminum	Steel	Steel	Steel	Steel