Finding the right bike crank arm set can improve shifting precision, power transfer, and overall ride feel. This guide highlights five well-regarded options that cover a range of drivetrains, materials, and sizes. Each product is suitable for common mountain, road, and hybrid bikes, with attention to compatibility, weight, and durability. Use the buying guide below to compare key features and fitment before purchasing.
Summary of chosen products:
| Product | Brand | Crank Arm Length | Chainring Size | BCD (Crank Spacing) | Notes |
|---|---|---|---|---|---|
| THALOUS Bicycle Crankset 42-34-24T | THALOUS | 170mm | 42-34-24T | Unknown exact BCD | Forged aluminum, square taper, 3x derailleur compatibility |
| GANOPPER BMX Crankset 32T | GANOPPER | 152mm | 32T | 104mm | Lightweight, square/crank style for BMX/MTB |
| BNVB Bike Crank Arm Set | BNVB | 170mm | — | 104mm | Ultra-light aluminum, 68–73mm BB width |
| Rhinenet Left 170mm Crank Arm | Rhinenet | 170mm | — | — | Left-arm replacement, aluminum alloy |
| Relwears FC-TY301 42-34-24T | Relwears | 170mm | 42-34-24T | 104mm | DUAL SIS indexing, versatile 3×8/7/6 gears |
The products above were selected for compatibility with common 3x drivetrains, a range of crank arm lengths, and solid materials. Each option provides a different balance of weight, stiffness, and ease of installation. Continue reading to see detailed product sections with key features, images, and how they fit into typical build goals.
THALOUS 42-34-24T Square Crank Set Review
The THALOUS crank set uses a forged aluminum 6061-T6 construction delivering a good mix of strength and lightness. With a 170mm crank arm and a 42-34-24T chainring configuration, it targets versatile performance on mountain bikes and compatible 3x drivetrains. The square taper interface is common for upgraded or legacy builds, and the model claims precise indexing and durable shifting. At approximately 1.5 pounds, the weight is competitive for an all-metal 3x crank. Pros include robust build quality and broad compatibility; potential drawbacks involve the need for correct chainline alignment on older frames.
Fit and setup considerations: Verify your bottom bracket shell compatibility and ensure your chainline aligns with the chainrings. This model suits riders looking to restore or upgrade from a factory triple crank without changing pedals or front derailleur. It’s well-suited for riders who value reliable, stable shifting over extreme weight savings.
GANOPPER BMX Crankset 32T: Compact Power
The GANOPPER crankset focuses on a compact 32T chainring with a light 152mm arm length. Built from aluminum alloy, this square-taper design is positioned for BMX and some MTB applications, offering a lower gear option for riders tackling steep climbs or technical sections. The 104mm BCD provides a familiar spacing for common single-front-ring configurations. Its strengths lie in its lightweight feel and straightforward installation, while the 32-tooth ring may limit top-end gearing on some mountain setups. This is a budget-friendly option for riders prioritizing agility and quick responsiveness.
Installation notes: Confirm compatibility with your chainline, and check whether your frame can accommodate the shorter 152mm crank. It’s a practical choice for riders who want a simple upgrade without changing multiple drivetrain components.
BNVB 170mm Crank Set With Bottom Bracket Bolts
BNVB presents an ultra-light aluminum alloy crank with a 170mm arm length and 104mm BCD, designed for MTB, BMX, and road bikes that use standard 9/16″ pedals. Weighing roughly 675 grams, BNVB emphasizes a balance of rigidity and lightweight construction for better control and power transfer. The set includes bottom bracket bolts and chainring bolts, streamlining installation. Riders will appreciate the ergonomic, lightweight profile for sprinting and technical sections alike, along with the broad 68–73mm bottom bracket width compatibility. Ensure your frame accepts a 170mm arm and 104mm BCD for best results.
Performance takeaway: This option prioritizes a lightweight build without sacrificing structural integrity. It’s well-suited for riders upgrading from stock cranks who want a noticeable weight reduction and improved stiffness, particularly on agile or endurance-focused bikes.
Rhinenet Left 170mm Crank Arm: Left-Only Upgrade
The Rhinenet option is a left-side replacement crank arm optimized for specific builds that require a single-arm upgrade. With a 170mm length, it’s designed to complement compatible right arms or existing crank configurations. The materials are aluminum alloy, emphasizing a balance of strength and lightness. The listing highlights straightforward installation and a finish that resists wear and color fading. This is a niche choice best suited for riders dealing with a damaged left arm or seeking a precise, single-arm replacement within a compatible system.
Key fit considerations: Confirm that your crankset accepts a left-arm replacement and verify both the spindle interface and chainring clearance to avoid interference with the chain and derailleur. It’s a practical choice for repairs or upgrades where only one arm needs replacement.
Relwears FC-TY301 42-34-24T Crank Set
Relwears presents a full 3x crank set with 42-34-24T gearing and a 170mm arm length. Compatible with 3×8, 3×7, and 3×6 speed drivetrains and 9/16″ pedals, it emphasizes versatile shifting and broad component compatibility. The crank is made from aluminum alloy, offering rigidity while keeping weight reasonable. The dual SIS indexing is highlighted for precise shifting across gears, with emphasis on wide compatibility. This set is suitable for riders who want a cost-effective upgrade that preserves the functional range of a traditional triple crank while improving rigidity and shift feel.
Practical notes: Check your frame’s bottom bracket shell width and the chainline to ensure proper alignment with the front derailleur. This option balances reliability and cross-compatibility across multiple drivetrain configurations for riders who don’t want to be limited by a single gear setup.
PETCHOR 32T 170mm Square Taper Crank Set
PETCHOR offers a 32T chainring with a 170mm crank arm in a 104BCD footprint. The kit is designed for 9/16″ pedals and includes 32T chainring options compatible with 1/2″ x 1/8″ chains. The narrow-wide tooth profile helps improve chain retention on rough terrain, and the design supports easy modification into single-speed or dual-chainring configurations. The 3/32″ chainline and 158mm total chainring diameter indicate an emphasis on lightweight performance and versatility for mountain biking and mixed-terrain riding.
Considerations: The 32T setup may limit high-speed efficiency on steep, sustained climbs unless paired with a larger chainring on the rear or a different gearing plan. It’s best for riders prioritizing compact gearing and weight reduction for technical terrain or urban commuting with varied elevations.
Buying Guide: Key Considerations For Choosing A Crank Arm Set
When selecting a crank arm set, consider compatibility with your bike’s drivetrain, bottom bracket, and frame geometry. Here are essential factors to evaluate:
- Crank Arm Length: Common options are 170mm and 175mm. Longer arms can increase leverage but may affect knee clearance and fit on tighter frames. Shorter arms can improve pedal clearance and leverage for smaller riders.
- Chainring Configuration and BCD: 32T, 34T, 42T options are typical for triple setups; 104mm BCD is common for square taper cranks and allows compatibility with many aftermarket chainrings.
- Drivetrain Compatibility: Confirm whether the crank is designed for 3x systems (3×6/7/8 speeds), and check compatibility with your front derailleur and chainline requirements.
- Interface Type: Square taper remains common for older bikes and some entry-to-mid-level upgrades. Diamond hole (for some Alps2Ocean options) demands matching spindle interfaces; verify fit before purchasing.
- Material and Weight: Aluminum alloys provide a balance of stiffness and lightness, while forged designs can offer higher strength. Lighter sets may reduce rotational inertia but could come at higher cost or lower durability in extreme use.
- Bottom Bracket Width and Shell Type: Typical widths vary from 68mm to 73mm. Ensure the crank’s spindle width and BB compatibility align with your frame’s bottom bracket.
- Chainring Retention and Compatibility: Narrow-wide (for better chain retention) versus traditional chainrings impact performance on rough terrain. Removable chainrings can offer customization for single, double, or triple setups.
- Installation and Maintenance: Some kits include bolts and hardware; others require separate purchases. Confirm that you have the necessary tools and compatibility with your current chain, derailleur, and crank bolts.
In summary, the best crank arm set for you depends on your riding style, frame compatibility, and whether you prefer a lightweight upgrade or a more robust triple-gear setup. The options listed here cover a range of priorities—from straightforward, cost-effective upgrades to lightweight designs intended for nimble handling and speed on mixed-terrain rides. Always verify fitment with your specific frame and components before purchasing.