Stone 144BCD Round Chainring 42T–70T for Fixed Gear, Track, Fixie & Single Speed Bikes (5-Bolt, 1/2″ x 1/8″ Chain, 7075 Aluminum)
The Stone 144BCD round chainring is a CNC-machined, single speed chainring designed for fixed gear, track, fixie, and single speed bicycles. Offered from 42T to 70T, it lets riders fine-tune gearing for street riding, velodrome use, or training.
For single speed bikes only.
Not compatible with 7/8/9/10/11/12 speed bikes.
Compatibility
- Fits 144BCD 5-bolt cranksets.
- Designed for fixed gear, track, fixie, and single speed bicycles.
- Works with 1/2″ x 1/8″ single speed chains.
- Not compatible with 7-12 speed drivetrains.
- Not compatible with road bike multi-speed systems.
- Not compatible with MTB drivetrains.
- Please confirm your crank BCD is 144BCD before purchase.
Specifications
- Brand: Stone
- Type: Round chainring
- Material: 7075-T651 aluminum alloy
- Material hardness: HB150
- BCD: 144BCD
- Bolt pattern: 5 bolt
- Speed: Single speed
- Chain compatibility: 1/2″ x 1/8″
- Thickness: 4mm
- Manufacturing: CNC machined
- CNC precision: 0.03mm
- Finish: Anodized
- Color: Black
- Teeth options: 42T-70T
Available Sizes
The chainring is available in 42T to 70T. Maximum outer diameter and weight listed below are for reference only; actual product weight may vary slightly due to production batch or product upgrades.
| Teeth | Max Outer Diameter | Weight |
|---|---|---|
| 42T | 176mm | 63.5g |
| 43T | 180mm | 69.5g |
| 44T | 184mm | 94g |
| 45T | 188mm | 84g |
| 46T | 192mm | 91.5g |
| 47T | 196mm | 96g |
| 48T | 200mm | 113.5g |
| 49T | 204mm | 117g |
| 50T | 208mm | 122.5g |
| 51T | 212.5mm | 128g |
| 52T | 216.5mm | 134.5g |
| 53T | 220.5mm | 139.5g |
| 54T | 225mm | 145.5g |
| 55T | 228.5mm | 149.5g |
| 56T | 232.5mm | 156.5g |
| 57T | 236.5mm | 164.5g |
| 58T | 241mm | 170g |
| 59T | 245mm | 176g |
| 60T | 249mm | 183g |
| 61T | 252.7mm | 217g |
| 62T | 257mm | 225g |
| 63T | 261mm | 245g |
| 64T | 265mm | 254g |
| 65T | 269mm | 261.5g |
| 66T | 273mm | 271g |
| 67T | 277mm | 280.5g |
| 68T | 281mm | 288g |
| 69T | 285mm | 279.5g |
| 70T | 289mm | 306g |
Features
- 144BCD standard – fits most 5-bolt track / fixed gear cranksets.
- Wide size range: 42T to 70T – ideal for street riding, velodrome, training, and custom gearing.
- Single speed specific tooth profile – optimized for 1/2″ x 1/8″ chains.
- 7075-T651 aerospace aluminum – high strength and lightweight.
- Precision CNC machined – excellent roundness and smooth chain engagement.
- 4mm thickness – strong, stable, and resistant to flex.
- Black anodized finish – durable surface with a premium appearance.
- Includes steel bolts – ready to install.
Important Compatibility Notes
- For single speed bikes only. Not compatible with 7/8/9/10/11/12 speed bikes.
- Please confirm your crankset uses the 144BCD 5-bolt standard before purchase.
- Please confirm your chain size is 1/2″ x 1/8″.
Package Includes
- 1 x Chainring
- 5 x Steel bolts
Warm Tip
Please confirm your crankset uses the 144BCD 5-bolt standard before ordering.
This chainring is made for single speed / fixed gear use only.
