Best 170 Mm Crank Arm for Reliable Bike Upgrades and Replacements
Choosing the right 170 mm crank arm is essential for ride comfort, power transfer, and compatibility with your bike’s bottom bracket and pedal interface. This guide highlights select 170 mm crank arms available on Amazon, focusing on square and diamond hole interfaces, forged aluminum or steel construction, and broad compatibility with mountain, road, and e-bike setups. Each option is evaluated for durability, installation ease, and fit to help you decide what best suits your frame and riding style.
| Product | Brand | Interface |
|---|---|---|
| Epessa Crank Arm Left 170mm (Diamond/Square) | Epessa | Diamond & Square |
| LXFNDZW Crank Arm 170mm Left | LXFNDZW | Square Taper |
| WEEROCK Left Crank Arm 170mm | WEEROCK | Diamond Hole |
| PROWHEEL Crank Arm 170mm (Square) | PROWHEEL | Square Taper |
| Alps2Ocean 170mm Left Crank Arm | Alps2Ocean | Diamond Hole |
Epessa Crank Arm Left 170mm (Diamond/Square)
Epessa offers a left crank arm compatible with both Diamond Interface and Square Interface spindles, with a 170 mm hole spacing and a total length of 210 mm. It fits standard 9/16 inch pedals and uses a high-quality aluminum alloy construction for light weight and durability. This option is designed for users who want flexibility in spindle interfaces to match their original crank port.
Epessa Crank Arm Left 170mm (Diamond/Square)
This listing confirms dual spindle interface support (Diamond and Square), 170 mm hole spacing, and a 210 mm overall length. The crank arm is made from a high-quality aluminum alloy, suitable for riders who need a versatile replacement that can adapt to different crankset configurations without changing other components.
LXFNDZW Mountain Bike Crank Arm 170mm Left
Designed for broader compatibility, this 170 mm left crank arm supports standard square taper bottom brackets and multiple bike types, including mountain and road bikes. Crafted from durable steel, it emphasizes long-term performance and reliable power transfer. Installation is straightforward with a common square taper interface, aiding quick upgrades or repairs.
WEEROCK Left Crank Arm 170mm Steel
The WEEROCK option uses steel construction measuring 170 mm in length with a diamond hole interface. This choice emphasizes durability for riders who put higher stress on crank arms, such as those tackling rugged terrains or heavy training loads. The diamond hole ensures compatibility with compatible left or right crank configurations.
PROWHEEL Square Taper 170mm Crank Arm
The PROWHEEL crank arms are forged from high-quality 6061 aluminum alloy and come in multiple lengths, including 170 mm, for e-bike compatibility. The square taper interface requires matching orientation of the crank arms. This model emphasizes strength and rigidity for dependable performance on electric bikes and traditional bikes alike.
Alps2Ocean 170mm Left Crank Arm
Alps2Ocean provides a forged 6061 aluminum crank arm in 170 mm length, available with a Diamond Hole interface. It’s designed for durability and compatibility with a range of city, folding, MTB, and road bikes. The product highlights include a sturdy build and the standard fit for square or diamond hole configurations based on the model chosen.
Buying Guide: 170 mm Crank Arms — Key Purchase Considerations
Choosing the right 170 mm crank arm involves assessing compatibility, durability, and the riding context. Consider the following factors to guide your decision.
- Interface compatibility: Diamond vs Square holes determine which spindles you can attach. Confirm both the crank arm and spindle match your bike’s original port.
- Arm length and bottom bracket compatibility: 170 mm is a common size, but verify your bottom bracket standard (JIS/Squared) and pedal threading. Ensure total length aligns with your frame geometry for optimal clearance and pedal stroke.
- Material and durability: Aluminum alloys offer light weight and adequate stiffness; steel provides maximum strength for tough terrain. Choose based on riding style and maintenance expectations.
- Installation and tools: Square taper arms typically require standard crank pullers and wrenches. Diamond hole models may require attention to orientation but can yield broader compatibility with certain frames.
- Intended use: Mountain biking, road cycling, and e-bikes have different load demands. If upgrading an e-bike, ensure the arm is rated for higher torque and compatible with the drive system.
- Compatibility with pedals: Most 170 mm arms fit 9/16 inch pedals, but confirm pedal interface to avoid mismatches and ensure safe pedaling.
- Installation risk: When replacing crank arms, inspect the bottom bracket for wear and ensure proper torque during installation to prevent loosening or damage.
- Availability and replacement parts: Some models offer dual interfaces (Diamond/Square). If you’re uncertain about your current setup, choose a model offering flexibility to minimize future changes.
Overall, select a 170 mm crank arm that matches your bike’s spindle type, pedal threading, and frame clearance. For riders upgrading components or restoring an older bike, prioritize compatibility with the bottom bracket and a robust material that supports your typical riding conditions.