Hub

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The front wheel hub contains the Wheel Bearings. The brake rotor (or brake drum) is bolted to the hub.

Overview

drum hub vs. disk hub
click

The brake rotor bolts to the back of the hub

The hub slip over the spindle

D1 25mm inner bearing journal diameter
D2 15mm outer bearing journal diameter

hub on spindle

comparo

Specs

Drum Hub

B122 Disc Brake Hub

Part Numbers

DRUM - ASSY-HUB ROAD WHEEL FRONT

• B110: 40202-18051 DRUM BRAKE
• B210: 40202-18000 DRUM 1974-1975
• B210: 40202-H7405 DRUM 1976-1978 Japan

??? (is this drum or disc hubs?)

• B210: 40202-H7425 DRUM 7510- Van Japan
• B210: 40202-H7425 DRUM 1976-1978 Japan

DISC - ASSY-HUB ROAD WHEEL FRONT

• B110: 40202-H1005 DISC BRAKE
• B210: 40202-H1005 DISC 1974-1975 GX
• B210: 40202-22000 DISC -0775 USA
• PB210: 40202-22050 DISC 1974-1975
• PB210: 40202-A0155 DISC 7510-
• B210: 40202-A0155 DISC 0875- USA
• B210: 40202-A0155 DISC 1976-1978 L16 Japan
• B310: 40202-H7405 DISC, small rotor (Canada A12A)
• B310: 40202-W5050 DISC, large rotor (A14/A15, A12A USA)

Bearing Seal

See Wheel Bearings

Grease Caps

Replace the caps if grease is leaking out:

Buy at Bprojects

Larger size dust cover 43mm
40234-18000 CAP-HUB FRONT WHEEL 
* B10
* B110
* early B120 to 7510
* early B210 to 7510

Smaller caps 40 mm
40234-28500 CAP-HUB FRONT WHEEL 
* B310 (both hub types)
* Late B210 from 7510 (both hub types)
* Late B120 from 7510

A10 Hub

A10 uses same hub as 710.

1.25" inner bearing journal diameter
0.75" outer bearing journal diameter