Premium Chainring Upgrade for Brompton Bikes
The White Industries MR30 TSR 1x Chainring brings precision-machined performance to Brompton folding bikes equipped with White Industries MR30 cranks. The TSR (Tall-Short-Ring) narrow-wide tooth profile alternates between tall and short teeth to keep your chain securely engaged through city streets, rough pavement, and aggressive riding—no chain guide needed. Made in-house at White Industries' California facility from 7075-T6 aluminum, these chainrings are built to handle the unique loads of Brompton riding while maintaining smooth, quiet operation and extended drivetrain life.
We stock 44-tooth and 50-tooth options to suit different riding styles and terrain. The 44t provides excellent acceleration and climbing ability for hilly cities or loaded touring, while the 50t offers higher top speeds for flat terrain and longer commutes. Both sizes work with Brompton's standard drivetrain and can be swapped easily to change your gearing setup. Available in Boost (flat, 0mm offset) or Standard (3mm offset) versions to dial in your exact chainline, with black anodized or raw silver finishes to match your bike's aesthetic.
Brompton Performance Upgrade
- TSR (Tall-Short-Ring) narrow-wide tooth profile prevents chain drops on rough city streets and pavement without adding a chain guide.
- CNC-machined in California from 7075-T6 aluminum for exceptional strength and durability under Brompton's unique folding loads.
- Available in 44-tooth (better acceleration and climbing) or 50-tooth (higher top speed for flat terrain) sizes.
- Boost (0mm offset, flat) and Standard (3mm offset) versions available for precise chainline tuning on Brompton frames.
- Compatible with Brompton's standard drivetrain and Shimano-compatible 9/10/11/12 speed chains.
- Significant upgrade over stock Brompton chainrings—smoother shifting, longer wear life, and more secure chain retention.
- Available in black anodized or raw unpolished silver finish to complement your Brompton's style.
- Designed exclusively for White Industries MR30 series spindle cranks installed on Brompton bikes.
- Easy to swap between 44t and 50t sizes to adjust gearing for different riding conditions or touring vs. commuting.
- Made in USA with White Industries' reputation for precision and long-lasting performance.
