Technical_Raleigh Twenty

Bottom Bracket Raleigh
 76mm wide shell. 26tpi / ISO is 24tpi)

Front Forks Raleigh
 Narrow Spacing (90mm) threading 26tpi

Frame
 The rear triangle is spaced at 114mm to accept Sturmey-Archer AW hubs.
Seat-Post
- 28.6mm diameter, chromed steel

Wheels /  Hubs and Gearing
wheels ISO 451mm or ISO 406mm, typically 28-spoke steel rims.
  Single speed with coaster brake
- 3-speed (Usually Sturmey-Archer AW, but sometimes AG dynohub)
- New-Zealand built versions offered a 2-speed "duomatic" rear hub with coaster brake.
- Some versions have Shimano 3-speed hubs.
- 46-tooth Chain-wheel and 15-tooth sprocket, giving gears of approx. 46 - 61 - 83 gear inches.

Brakes
- Standard Raleigh Brakes on ISO 451mm-wheeled versions
- Weinmann Long Reach Callipers on ISO 406mm-wheeled versions 

Handlebars
three main types of handlebar used on Twenties
1.) One-piece "All-rounder" bars.
2.) Two-piece "All-rounder" bars.
3.) Two-piece "North-Road" bars.

All production handlebars were held on by a clamp around the top of the forks, and the stems do not have binder bolts.

Please note: The stem has a height-limiter in the form of a loop of stiff wire which runs around the front brake bolt. To remove the handlebar and stem from the frame, you must first remove the front brake.