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Lockring
From WikiPedalia
A thin locknut used to keep A threaded assembly from coming unscrewed. Conventional bottom brackets use a lockring on the adjustable cup to make it hold its adjustment.
- Hyperglide cassettes and freewheels use a splined lockring to hold the sprockets to the body.
- Fixed-gear hubs use a left (reverse) threaded lock ring to keep the sprocket from unscrewing when the cyclist resists the motion of the pedals.
Cassette and Fixed-Gear (Track) Hub Threaded Outer Sprocket/ Lockring Threading
| Brand and model | Threading | Note |
|---|---|---|
| Campagnolo cassettes (all threads external on lockring) | ||
| 8-speed | 29 x 1 mm | Different outside diameters for 11T or 12-14T outer cog |
| 9- and 10-speed 1996-1999 | 26 x 1 mm | Different outside diameters, for 11T or 12-14T outer cog |
| 9- and 10-speed 2000- | 27 x 1 mm | Different shapes: may not be compatible |
| 11-speed | 27 x 1 mm | |
| Shimano cassettes | ||
| Uniglide (most) smallest sprocket | 1.37 x 24 TPI external on hub | Threading same as track cogs, SunTour New Winner 7-speed outer sprocket, English BB lockring |
| Dura-Ace Uniglide, 11T smallest sprocket | 32 mm (approx.) x 24 TPI external on hub | Smaller thread diameter to permit 11T outer sprocket. |
| Hyperglide lockring | 30 mm (approx) x 24 TPI external on lockring | Different outside diameters for 11T or larger sprocket |
| Capreo/Chosen lockring | 22 x 1 mm Capreo, 22 mm x 30 TPI Chosen (approx), external on hub | Smaller diameter to work with 9T sprocket |
| Fixed Gear lockring (Left threaded) | ||
| Campagnolo, Phil Wood | 1.32 vx 24 TPI | |
| English | 1.29 x 24 TPI | Fits most U.S., English, and Asian fixed-gear hubs. Also used on older English coaster brakes with threaded sprocket |
| French | 33 x 1 mm | |
