Hub

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The front wheel hub contains the Wheel bearings. The brake rotor bolts to the hub on disc brake models.

Overview

drum hub vs. disk hub - The drum hub is shorter, so that after the drum is placed over it, the track exactly matches the disc version.
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The brake rotor bolts to the back of the hub (see Replacing Rotors)
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hub slips onto spindle (which is on the bottom of the strut)
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late Disc Brake Hub from 1989 October (not early B122)

Specs

The hub slips over the spindle, thus the bearing sizes must match

B110 Wheel bearings
  D1 spindle inner 25 mm bearing journal diameter (0.9840")
  D2 spindle outer 15 mm bearing journal diameter (0.5906")
1200 1976-up
  D1 spindle inner 27 mm bearing journal diameter (1.0625")
  D2 spindle outer 17.5mm bearing journal diameter (0.6875")


B110 hub
  D1 hub inner 52 mm bore diameter (2.0470")
  D2 hub outer 42 mm bore diameter (1.6535")
1200 from 1976
  D1 hub inner 50.3mm bore diameter (1.980")
  D2 hub outer 39.9mm bore diameter (1.570")

B110 Drum Hub EXTERNAL measurements
* 135 mm diameter (disc hub is more than 140mm)
* 47 mm height (disc hub is ~52 mm)
* about 82 mm overall length

The drum hub is shorter, so that when the drum is placed over it the track exactly matches the disc version.

Spindle Comparo
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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

A08 Hubs

510 style bearings are 210 (outer) and A08 (inner). They are smaller O.D. than B110 bearings, but fit on larger spindles.

27mm inner bearing journal diameter
0.6875" outer bearing journal diameter

Hubs using A08 bearings include:

B120 1976-

B210 1976- Japan 

Japan 710 early 1973-1975 (-7602)
40202-22050 [disc] HUB ASSY-front wheel GL,SSS
40202-21050 [drum] HUB ASSY-front wheel STD,DX

Japan A10 Disc: S,K,HB (except STD), Van.GL
B310 Disc: A14 & A15
40202-W5050 [disc] front HUB small bearings (210 & A08 bearings)
 

A01 Hubs

A01 are extra-large wheel bearings.

1.25" inner bearing journal diameter
0.75" outer bearing journal diameter
See A0100 Wheel Bearings

USA 710 all (1974-1976) DISC BRAKES
JAPAN GB211 (1976-1977) DISC BRAKES

Japan 710 late 1976-1977 (7509-7704)
40202-A0155 [disc] HUB ASSY-ROAD WHEEL FRONT
40202-N7150 [drum] HUB Van, LPG (taxi), Sedan.STD

Japan A10
Drum: Sedan.STD, Van.STD, Van.DX
40202-N1750 [drum] front HUB large bearings (A01 bearings)

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
* 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)