Cycle threads
Posted: Monday 21st September 2020
CE Institute standard cycle threads and specials for single except where otherwise stated
| Description | Diameter | TPI | Remarks |
| Steering column | 1 1/8" | 26 | Oversize for Tandem |
| Steering column | 31/32" | 30 | |
| Steering column | 1" | 24 | Standard for early forks |
| Steering column | 1" | 26 | Chater-Lea and Raleigh |
| Bottom bracket shell and cups, also rear wheel sprocket | 1.370" | 24 L and R | |
| Bottom bracket specials | 1.376" | 26 L and R | Raleigh bracket |
| Bottom bracket specials | 1.450" | 26 L and R | Chater-Lea and Tandem |
| Pedal Spindle crank end | 9/16" | 20 L and R | |
| Pedal Spindle crank end | 5/16" | 26 | |
| Front Wheel Spindle | 5/16" | 26 | |
| Front Wheel Spindle | 3/8" | 26 | |
| Rear Lock Ring for SPKT | 1.290" | 24 Left-hand | |
| Clamp bolts for seat pillar | 5/16" | 26 | |
| Clamp Bolts for head clip | 3/8" | 26 | Tandem |
| Clamp Bolts for handlebar | 5/16" | 26 | |
| Clamp Bolt for alloy handlebar | 1/4" | 26 | |
| Cotter Pins | 17/64" and 1/4" | 26 | |
| Chain adjusters & Brake screws | 3/16" | 32 | |
| Saddle clip bolts | 5/16" | 18 | |
| Saddle Tension bolts | 3/8" | 20 | |
| Tricycle saddle bolts | 7/16" | 14 | |
| Chater-Lea Chainwheel screw | 17/64" | 15 | Only used by Chater-Lea |
| Standard Chainwheel screw | 3/16" | 32 | |
| Sturmey Archer rear axle | 0.4" | 26 | |
| Spoke Sizes. SWG No: | cut / rolled thread | ||
| Spoke sizes. SWG No: 17 | 0.056 | 62 56 | |
| Spoke sizes. SWG No: 16 | 0.064 | 62 56 | |
| Spoke sizes. SWG No: 15 | 0.072 | 62 56 | |
| Spoke sizes. SWG No: 14 | 0.080 | 62 56 | |
| Spoke sizes. SWG No: 13 | 0.092 | 56 | |
| Spoke sizes. SWG No: 12 | 0.104 | 44 |
Thanks for reading
Posted: Monday 21st September 2020
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