Replacement bicycle crank arm designed to restore reliable pedalling and reduce drivetrain noise. ByPaCrow Bike Crank Arm brings reassurance for home mechanics and riders needing a durable left-side replacement. Will the square-hole 170mm fit match your bike and spindle interface?
⚡ At a Glance
- • Build Quality: Aluminium alloy construction with precision machining for improved chain retention, reduced friction and quieter operation
- • Best for: Cyclists and home mechanics needing a left-side replacement for mountain or road bikes with square-hole crank interfaces
- • Not ideal for: Bikes that use non-square spindle interfaces or require a right-side crank arm
Left 170mm crank arm machined to precise tolerances for reliable chain engagement. Square-hole interface suits square-taper spindles commonly found on many mountain and road bikes.
Reliable chain retention – thanks to precision machining
Center distance between the two crank arm holes and chainring bolts is specified at 170mm and manufactured to precision tolerances, which helps maintain correct alignment. Precision machining also reduces play that would otherwise increase friction and noise.
Accurate spacing keeps the chain tracking cleanly and reduces drivetrain noise, making pedalling feel smoother and more predictable.
Durable construction – with aluminium alloy material
Forged aluminium alloy construction provides strength while resisting deformation under normal riding loads. Surface finishing and polishing improve wear resistance and contribute to structural integrity.
Sturdy build holds up to regular use and repair situations, offering a longer service life than lower-quality replacement arms.
Straightforward fitment for square-taper spindles – thanks to the square hole interface
Designed specifically as a left crank arm with a square hole interface, compatible with horizontal round taper and square taper spindle types where a square-hole crank is required. The package includes a single left 170mm arm for replacement use.
Quick to install for anyone familiar with square-taper cranksets, making it a practical option for timely repairs or upgrades.
✨ The 4 Key Reasons for ByPaCrow Bike Crank Arm
- Precision 170mm spacing - Keeps chain alignment accurate and reduces drivetrain noise
- Aluminium alloy construction - Resists bending and maintains strength under normal riding loads
- Square-hole spindle interface - Fits square-taper spindles for straightforward replacement
- Polished finish and paint - Improves appearance while helping to resist corrosion
📋 Technical Details at a Glance
- Category: Bicycle crank arm
- Brand: ByPaCrow
- Material: Aluminium alloy
- Length: 170mm
- Hole centre distance: 170mm between crank arm holes and chainring bolt holes
❓ Frequently Asked Questions
Q: Is this crank arm suitable for both mountain and road bikes?
A: Compatibility covers many mountain and road bikes that use square-hole crank arms, so it can be suitable when the bike uses a square-taper spindle and a left 170mm arm is required.
Q: Which spindle interface does the arm fit?
A: The arm has a square hole interface designed for square-taper spindles; the description also references horizontal round taper and square taper spindle types, so check the bike's spindle type before ordering.
Q: What is included in the package?
A: The package contains a single left-side 170mm crank arm, precision machined for chain retention and reduced friction.
🏆 Our Verdict
The ByPaCrow Bike Crank Arm suits cyclists and home mechanics who need a dependable left-side replacement for square-taper cranksets. Precision 170mm spacing and aluminium alloy construction deliver reliable chain retention, reduced noise and a durable repair option. While exact cost varies by retailer, the robust build and straightforward compatibility suggest good long-term value for repairs and maintenance.
