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Classic Lightweights UK
Restoration  
 

Cycle threads

Submitted by Alexander Von Tutschek

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 outer end 5/16" 26  
Front Wheel Spindle 5/16" 26  
Rear 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" 25 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