The Alter Cycles Midnight Cog is a rear cog designed around lightweight construction, high strength and precise drivetrain performance. It is suitable for single speed riders who care about pedaling response, drivetrain details and bike color matching.
This cog is CNC-machined from a 5mm 7075 aluminum plate. 7075 aluminum offers excellent strength, while the carefully machined tooth angle and tooth length help maintain stable chain engagement and direct pedaling feedback.
Alter Cycles is a Taiwan-based brand dedicated to local design and production of refined, high-quality bicycle components. Each part is machined from a solid aluminum plate, requiring more time and production cost while reflecting the brand’s focus on machining precision, finishing quality and product details.
The Midnight series is available in black and purple. The black version offers a clean and understated look that matches easily with different frames and wheelsets. The purple version adds a stronger visual accent to the drivetrain area, ideal for riders who want color detail around the cog, chain, chainring or hub.
Available tooth counts include 15T, 16T, 17T, 18T and 19T, allowing riders to choose the right gear ratio based on riding style, strength and terrain. Smaller tooth counts provide a heavier feel and more speed-oriented setup, while larger tooth counts make starts easier and are often more practical for city riding.
If you are looking for a CNC-machined rear cog with refined finishing, lightweight construction and multiple tooth count options, the Alter Cycles Midnight Cog is a strong choice for single speed drivetrain upgrades.
⚠️ Please note: this product includes one rear cog only. Lockring, hub, chain and other parts are not included.
⚠️ Please confirm hub thread compatibility with BC1.37 x 24FPI before purchase.
⚠️ This product is 1/8". Please confirm chain compatibility before installation.
⚠️ Cog and lockring installation affects riding safety. Professional installation and lockring inspection are recommended.
Key Features
- Made from 5mm 7075 aluminum plate
- CNC precision machining
- Refined tooth angle and tooth length design
- Lightweight and high-strength construction
- Available in black and purple
- 15T / 16T / 17T / 18T / 19T options
- Designed for single speed drivetrain setups
- Designed and produced by a Taiwan-based brand
- Made in Taiwan
Specifications
Brand: Alter Cycles
Product Name: Midnight Cog
Material: 7075 Aluminum
Manufacturing: CNC Machined
Color: Black / Purple
Teeth: 15T / 16T / 17T / 18T / 19T
Thread: BC1.37 x 24FPI, 1/8"
Weight: 15T approx. 21g / 16T approx. 25g / 17T approx. 29.2g / 18T approx. 34g / 19T approx. 38.2g
Sale Format: One cog only
Features: Lightweight, CNC machined, 7075 aluminum, multiple tooth count options, drivetrain upgrade
Use: Single Speed / Track Bike
Made in: Taiwan
