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No Chain to break or come off
No external gears or parts
No more greasy hands and legs
No more ripped pants or pinched fingers

Smooth and quiet with very low maintenance

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Techincal Specifications

Shaft Drive System I Shimano Nexus 7 Speed Rear Hub Techincal Specifications.

Driveshaft Specification | Nexus Tech

bicycle shaft drive
Click to enlarge shaft drive

Driveshaft Specification Unit's

1 B.B.Parts (front gearbox) Aluminum 1
2 B.B.Shell Steel (56.6 x 51.5 x 52L ) 1
3 Right Cover Aluminum Alloy 1
4 Left Cover " 1
5 Front Stand " 1
6 Rear Stand " 1
7 Rear Gear Box " 1
8 Transmission Tube " 1
9 Crank Axle B22-Steel 1
10 Transmission Axle Carbon Steel 1
11 Crank Axle Gear Cromoly 1
12 Front Trans. Gear " 1
13 Rear Trans. Gear " 1
14 Hub Gear " 1
15 Right End Steel 1
16 Left End Steel 1
17 Washer n/a 1
18 Bearing 6003 n/a 3
19 Bearing 6203 n/a 2
20 Cap Screw Inner Hexagon M5 x P0.8 x 12 3
21 Cap Screw Inner Hexagon M5 x P0.8 x 14 8
22 Cap Screw Inner Hexagon M5 x P0.8 x 20 3
23 Cap Screw Inner Hexagon M6 x P1 x 16 2
24 Cap Screw Outer Hexagon M6 x P1 x12 2
25 Screw Tapping M4 x 20L 2
26 Washer 6.4 T = 1.6mm 4
27 Spring Washer 5.1 T = 1.3mm 14
28 Spring Washer 6.1 T = 1.5mm 4
29 Sprocket Circlip T = 2.3mm 1
30 Rear Gear Box Cover P.V.C 1


Click to enlarge exploded driveshaft diagram

Shimano SG-7R45


Inter-7 Rear Hub (7-speed)
  • Internal Gear Shifting
  • Shifting action is independent of pedalling. You can shift gears anytime, while standing still, pedalling, or coasting.
  • Heavy-Duty Construction Rugged planetary and step-up gear sets assure long trouble-free service.
  • Shift Modulator Mechanism Smoothes out the shifting action while pedalling.


Click to enlarge rear hub cutout

Function Name Inter-7
Speed 7-speed
Silent Clutch No
Shifting Power Modulator Yes
Shifting Lever SB-7S45, SL-7S10, ST-7S20
Internal Brake Inter M Brake BR-IM41-R, BR-IM50-R
Corrosion Resist Coating Yes
Gear Ratio Total 244&--37;
Gear Ratio 1 - 0.632
Gear Ratio 2 - 0.741
Gear Ratio 3 - 0.843
Gear Ratio 4 - 0.989
Gear Ratio 5 - 1.145
Gear Ratio 6 - 1.335
Gear Ratio 7 - 1.545
Axle length 201 / 182 mm
Over Lock-nut Dimension 130 mm
Spoke Hole 36H
Spoke Size --13, --14
Sprocket Teeth 16, 18, 19, 20, 21, 22, 23T
Chain-Line 15T -
Chain-Line 16T 45.3
Chain-Line 18T-22T 40.3 / 45.3
Weight 1465g
Gear Change Support No
Cassette Joint CJ-7S40 / CJ-NX10 / CJ-NX40