Wheel Types 10 to 14 – 5 Stud QD Rear, 1950-58, All Frame Types

After a break of 10 years a QD wheel was available again, similar in design to the earlier 3 stud design but with 5 studs and no pegs this time round. Initially offered as an option, it was standard fitment on Square Fours and is therefore frequently referred to, incorrectly, as a ‘SQ4 back wheel’.

Dangerous downward pointing brake arms – What is the problem and what can be done about it? Only bikes with plunger frames and brake arms that point downwards are affected, originally those produced between 1953 and 1954. The first time that many owners realize that there is a problem is when the rear wheel locks up causing the bike to skid to a halt or worse. This will happen when the rear brake is applied reasonably hard or when the suspension is compressed more than normal. As the suspension is compressed the brake plate rotates, effectively shortening the cable or rod and applying the brake, which, once it has locked up, will stay that way, as the torque reaction when the brake is applied does the same thing. The easiest solution is to ensure correct routing of the brake cable and plenty of slack; the problem with this is that someone else using the bike or a later owner may adjust the cable to remove the slack. The more permanent solution is to change the arm to the later, upward pointing version by modifying the lug for the cable on the frame so that the cable is pointing upwards and to fit the later cable and return spring, drilling a new hole for the spring in the brake plate and re-positioning the cable adjuster lug on the brake plate. See also section 37, for a drawing showing the correct routing for the rear brake cables.

1950 7” brake with standard bolt on ring sprocket, torque arm on rigid frames and lug on plunger models, the plunger version used the standard brake plate.

1951-52 Sprocket and brake drum cast as one item and brake increased to 8” diameter, brake plate now cast aluminium without dust excluding rim.

1953 Cable operated brake on plunger and swinging arm frames only, spacer next to brake plate is deleted as it is incorporated in the casting, dust excluding rim added. Thread on spindle changed from 12 to 20 t.p.i.

1954-58 Style of fixed spindle nut and head of main spindle altered.

Type 10 Bolt on ring sprocket, 7”, rigid 1950 only and optional
Type 11 Bolt on ring sprocket, 7”, plunger frame, 1950 only
Type 12 Combined sprocket and brake drum, 8”, rigid, 1951-55 optional
Type 13 Combined sprocket and brake drum, 8”, plunger frame, 1951-58 standard on SQ 4, optional on other models
Type 14 Combined sprocket and brake drum, 8”, swinging arm frame, 1954-55, optional and rare

21Type1014

Years

Wheel Size

Spoke sets

Standard Rustless

Stainless Steel

Butted Stainless steel

5 Stud, QD (optional) – 40 spoke

1950-58 4G

18″

4521-50 x 20 / 4522-50 x 20 4521-50Q x 20 / 4522-50Q x 20 4521-50B x 20 / 4522-50B x 20

1950-58 All ex 4G

19″

4546-50 x 20 / 4547-50 x 20 4546-50Q x 20 / 4547-50Q x 20 4546-50B x 20 / 4547-50B x 20

For more information on wheel rims & spokes please click here

Years

Wheel Size

Wheel Rims

Standard

British Chrome

Stainless Steel

Bare Steel Where available

5 Stud, QD (optional) – 40 spoke

1950-58 4G

18″

4501-50 4501-50B 4501-50Q 4501-50N

1950-58 All ex 4G

19″

4502-50 4502-50B 4502-50Q 4502-50N

Part No.

Description

Per

Type

Years

0522

Sprocket bolt 10 10,11 1950

0522Q

Sprocket bolt, stainless 10 10,11 1950

0714

Bolt, torque arm to swinging arm 1 14 1954-55

0718

Bolt, torque arm and lower chainguard to frame 1 12 1951-55

1440-89

Bearing, LH, sealed type 1 All 1950-58

4052-48

Locking ring for bearing LH and RH 2 All 1950-58

4080-00

Brake cam bush, weld in place 1 10,11 1950

4082-47

Brake adjuster wedge 1 All 1950-58

4108-26

Brake shoe rivet, 1/8×1/2 countersunk alloy All 1950-58

4110-26

Brake shoe return spring 2 All 1950-58

4115-46

Brake cam 1 All 1950-58

4118-29

Brake cam washer 1 All 1950-58

4305-32

Sprocket, ring type 47T 1 10,11 1950

4342-39

Bearing, RH, sealed type 1 All 1950-58

4346-50

Bearing collar, RH 1 All 1950-58

4370-32

Brake plate dust cover in polished stainless steel. 1 10,11 1950

4375-54

Anchor bar or torque arm 1 14 1954-55

4383-42

Brake wedge holder, cast in brass 1 10,11 1950

4385-38F

Brake shoe, C15/97, exchange, pair 1 10,11 1950

4385-51F

Brake shoe, C15/213, exchange, pair 1 12,13,14 1951-58

4387-38

Brake lining with rivets, pair, for 4385-38 (C15/97) shoes 1 10,11 1950

4402-56

Brake arm,  chrome plated 1 13,14 1953-58

4415-29

Brake arm return spring, UP 1 11 1950

4415-36

Brake arm return spring, DOWN 1 10 1950

4415-51

Brake arm return spring, UP 1 12 1951-55

4415-51

Brake arm return spring, UP 1 13 1951-52

4415-51

Brake arm return spring, UP 1 13 1956-58

4415-53

Brake arm return spring, DOWN See note above 1 13,14 1953-55

4440-50

Grease retainer, large 1 All 1950-58

4440B-50

Grease retainer, small 1 All 1950-58

4450-51

Sprocket/brake drum 1 12,13,14 1951-58

4451-50

Distance collar, LH 1 10,12 1950-55

4453-50

Sprocket stud 5 All 1950-58

4454-36

Sprocket nut to hub (chrome) 5 All 1950-58

4454-36Q

Sprocket nut to hub (chrome), stainless 5 All 1950-58

4459-35

Circlip, sprocket bearing 1 All 1950-58

4460-50

Fixed spindle circlip 1 All 1950-58

4460-96

Dust cover hammer drive rivet 8 12,13,14 1953-58

4465-50

Fixed spindle, course thread 1 All 1950-52

4465-53

Fixed spindle, fine thread 1 All 1953-58

4466-50

Fixed spindle nut, coarse thread 1 All 1950-52

4466-53

Fixed spindle nut, fine thread 1 12,13 1953-58

4466-53Q

Fixed spindle nut, fine thread, stainless 1 12,13 1953-58

4466-54

Fixed spindle nut, fine thread 1 14 1954-55

4467-53A

Dust rim on brake plate, stainless steel (see 4460-96, rivet) 1 12,13,14 1953-58

4469-50

Bearing seal, not required with sealed bearings 1 All 1950-58

4471-50

Bearing spacer tube 1 All 1950-58

4475-50

Spindle, main, 12 TPI 1 Oct-13 1950-52

4475-54Q

Spindle, main, 20 TPI, made from super tough stainless steel 1 12,13,14 1953-58

4476-50

Bearing seal, not required with sealed bearings 1 All 1950-58

4477-50Q

Brake plate spacer SS 1 11,13,14 1950-53

4478-51

Spacer next to brake plate, left hand 1 13 1951-53

4478-51A

Spacer, next to brake plate 1 13 1954-58

4481-50Q

Spacer right hand, stainless 1 11,13,14 1950-58

4484-50

Spacer right hand 1 10, 12 1950-55

4482-50

Spindle distance collar, left hand 1 10,12 1950-53

5434-53

Cable adjuster 1 13,14 1953-58

5435-53

Cable adjuster lock nut 1 13,14 1953-58

5731-54

Brake cable adjuster lug, on brake plate 1 13,14 1953-58

S2-3

Standard nut, brake arm to cam 1 All 1946-55
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