The Eccentric Ring CR-48 is a precision-engineered chainring set developed for cyclists who ride with SRAM cranksets utilizing a 130mm BCD (Bolt Circle Diameter). Featuring a dual chainring setup of 53T and 41T, this component is built for road cyclists who demand maximum drivetrain efficiency, optimized shifting, and superior durability in high-performance riding conditions.
🔧 Technical Specifications:
Product Code: CR-48
Tooth Count: 53T (outer) / 41T (inner)
BCD (Bolt Circle Diameter): 130mm – compatible with most SRAM road cranksets
Material: AL7075-T6 (Heat-treated Aerospace-Grade Aluminum)
Finish: Satin Black (S.B) anodized coating
Design: Eccentric chainring with precise CNC-machining
Branding: C.T laser-etched logo
⚙️ Material & Construction:
Crafted from AL7075-T6 aluminum, the CR-48 delivers exceptional stiffness-to-weight ratio, making it ideal for aggressive riders and racers. AL7075 is known for its high tensile strength, excellent fatigue resistance, and dimensional stability, ensuring long-lasting performance even under heavy pedaling loads.
Each chainring is CNC-machined to exact tolerances, ensuring flawless engagement with the chain, minimal friction, and enhanced durability. The Satin Black anodized finish adds a layer of protection against corrosion and wear, while giving the ring a clean, stealthy appearance.
🧠 Eccentric Design & Functionality:
Unlike standard chainrings, the eccentric design of the CR-48 introduces a subtle off-center alignment, improving chain tension during rotation. This leads to:
Reduced chain slack
Better chain retention
Improved torque consistency and power delivery
Enhanced shifting performance under load
This makes it particularly useful for time trialists, competitive road riders, or cyclists seeking marginal gains in drivetrain efficiency.
🔁 Compatibility:
Works with SRAM cranksets that use a 130mm BCD interface
Compatible with 9/10/11-speed chains and SRAM mechanical groupsets
Ideal for riders upgrading their OEM chainrings or customizing their gear ratios
Mounting requires standard 5-arm 130BCD crank spider
🚴 Use Case & Benefits:
Excellent for road racing, criteriums, and competitive endurance rides
Perfect for flat and rolling terrain where high-speed cadence is crucial
The 53T outer ring delivers maximum speed on descents and straights, while the 41T inner ring allows smoother transitions for moderate climbs
Provides clean aesthetics, premium material build, and consistent mechanical performance
