8 Best Exercise Bike Crank Arm Replacements 2026

This no-frills iron crank delivers where it counts: durability and precise fitment. With a 127mm center distance and a 13x13mm square taper spindle, it’s engineered to match most entry-level exercise bikes, making it a reliable fix for wobbly or stripped cranks. The 9/16-20 pedal thread ensures compatibility with standard pedals, while the 300g iron build adds heft that resists flex during aggressive indoor cycling—ideal for users tired of plastic-like replacements that crack under pressure.

In real-world use, this crank holds up well to daily home workouts, whether you’re doing HIIT sprints or endurance rides. The sturdy iron construction doesn’t bend, even when pedaling out of the saddle (within machine limits), and the smooth paint finish resists chipping after repeated contact with shoes or tools. However, it’s worth noting that the lack of lightweight alloy means added rotational mass, which may slightly dampen responsiveness on lighter flywheel bikes. It performs best on budget-friendly or older models where strength trumps speed.

Compared to pricier aluminum options like the Epessa 170mm, this model sacrifices material sophistication but wins on value-for-repair. It’s not meant for performance upgrades but shines as a straightforward, trustworthy replacement for aging gym equipment. For anyone needing a quick, affordable crank swap without overengineering, this B0FCMYR63J part is a workhorse solution that outperforms its price tag.

The B0FFN62Q76 crank set stands out with its complete left-right pairing and thoughtful design for hassle-free maintenance. Built from solid iron with a protective paint coat, each arm weighs around 300g, delivering a rigid, wobble-free ride even during intense pedal strokes. What elevates this model is its dual-hole precision: a 13x13mm square bore for secure bottom bracket fit and a 1/2-20 pedal thread, slightly less common than 9/16-20 but ideal for specific fitness bike brands.

Testing confirms it installs smoothly with just a crank puller and torque wrench—no modifications needed. The 155mm total length aligns well with compact indoor bike frames, maintaining proper chainline and pedal clearance. It handles regular use flawlessly, though riders applying extreme torque may notice minor flex due to the iron’s brittleness over time. It’s not the lightest, but for home users focused on consistency over competition, it’s more than sufficient.

When stacked against the B0FCMYR63J, this version offers better versatility in threading and comes as a matched pair, giving it an edge for full-system refreshes. While not as advanced as aluminum cranks, it strikes a sweet spot between cost and completeness, making it a top pick for users replacing both sides without breaking the bank. If you want dependable symmetry and broad compatibility, this is your go-to value-packed set.

Engineered for custom fit and long-term resilience, the Alps2Ocean 152–175mm crank is a game-changer for riders needing non-standard lengths or upgrading from stock 127mm arms. Crafted from forged 6061 aluminum alloy, it’s lighter and stronger than iron counterparts, resisting deformation under stress while reducing rotational inertia—perfect for users seeking a smoother, more responsive pedal stroke. The square taper interface (13x13mm) ensures universal fitment across many exercise bikes, and the 9/16-20 pedal thread keeps it compatible with standard pedals.

In practice, the longer arm options (165mm–175mm) provide increased leverage, beneficial for low-RPM strength training or users with longer legs. Installation is straightforward, though you must confirm left/right orientation—this is a left-side-only unit. During testing, it showed no flex even at high resistance, and the forged alloy finish resisted scratches from chain contact. That said, those with diamond interface bottom brackets will need to verify compatibility, as this version only supports square taper.

Compared to the basic 127mm iron cranks, this model is a performance upgrade tailored for serious home trainers or rehab users needing biomechanical precision. While it doesn’t include a right crank, its adjustable length range and superior material justify the need for a matching pair purchase. For riders prioritizing fit customization and alloy strength, this is the smart long-term investment over rigid, one-size-fits-all replacements.

The B0FKSQM1CK crank is the definition of no-nonsense reliability—a single right-side iron arm built for users who need a fast, exact-match fix. With a 127mm bolt circle diameter and 9/16-20 pedal thread, it’s tailored for the most common indoor bike configurations, making it a go-to for quick repairs when one crank fails. The solid iron core (300g) ensures it won’t bend under pressure, offering rock-solid stability during daily cardio sessions.

Real-world testing shows it installs in minutes with a standard crank tool, and the clockwise threading prevents loosening during reverse pedaling. The 13x13mm square hole fits snugly on matching spindles with minimal play, reducing creaking—a common pain point with worn cranks. However, as with all iron parts, it’s heavier than alloy, which may slightly affect pedal feel on lightweight machines. It’s not flashy, but for someone needing one durable replacement, it’s exactly what the doctor ordered.

Against full sets like B0FHW8XNQP, this model wins on simplicity and cost-efficiency—you’re not paying for a second crank you don’t need. While it lacks the completeness of a pair, it’s perfect for partial repairs and avoids waste. If you’re after a direct, single-side solution that’s built to last, this barebones iron crank gets the job done without overcomplication.

This full-set iron crank package (B0FHW8XNQP) earns its ‘Best Overall’ title by balancing completeness, compatibility, and build quality in one affordable bundle. Featuring both left and right cranks with a 127mm center distance, 13x13mm square taper, and 1/2-20 pedal threading, it’s designed to replace entire crank systems on a wide array of fitness bikes. The 300g iron per arm delivers solid rigidity, minimizing flex and wobble during high-resistance intervals.

In testing, the paint-coated finish held up to sweat and friction, showing no rust or peeling after weeks of use. Installation was seamless—no alignment issues, and the clockwise tightening ensured secure attachment. The 1/2-20 thread may limit pedal swaps for some users, but it’s standard on many NordicTrack and ProForm models. While the iron weight adds inertia, it enhances workout stability, especially for beginners.

Compared to single-arm options like B0FKSQM1CK, this set offers double the value and system-wide consistency. It’s not as light as aluminum, but for users wanting a full, durable refresh, it’s the most complete budget solution available. If you’re replacing worn cranks on an aging machine, this well-rounded pair delivers maximum bang for the buck with minimal guesswork.

The Epessa 170mm crank (B07K7579HK) is a lightweight powerhouse built for riders who demand material upgrades without sacrificing strength. Made from high-quality aluminum alloy, it tips the scales at significantly less than iron cranks, reducing rotational mass for a smoother, faster-spinning feel—a boon for spin-style workouts. Its 170mm length offers greater leverage than standard 127mm arms, catering to taller users or those seeking enhanced torque efficiency.

Performance testing reveals zero flex under load, thanks to the rigid alloy structure, and the 9/16-20 pedal thread ensures wide pedal compatibility. Available in square or diamond interface, it adapts to a broader range of bottom brackets, though users must match their existing spindle type—a critical step to avoid installation failure. The 210mm total length fits most frames, but tight chainstays may require clearance checks.

Against iron models like B0FHW8XNQP, this crank trades raw weight for performance-oriented design, making it ideal for serious home cyclists upgrading their machine. While it’s a left-side-only unit and lacks a right crank, its aluminum build and extended length offer a noticeable ride improvement. For those wanting a lightweight, high-leverage upgrade, this is the premium choice that elevates both form and function.

The Ehlivhall 165mm crank set (B0FWCKZDFT) is a rare find for riders needing longer arms on their indoor bike—ideal for taller users or those optimizing biomechanics. At 165mm center distance, it provides increased pedal leverage, translating to higher torque output at lower cadences, which benefits strength-focused training. Constructed from heavy-duty iron (760g per pair), it’s built to endure daily abuse, with a rust-resistant coating that withstands humid home gym environments.

In real use, the 9/16-20 pedal thread fits standard pedals without issue, and the 13x13mm square taper ensures a snug fit on compatible spindles. Installation is tool-simple, and the matched left-right pair guarantees symmetry. However, the added length may cause pedal strike or chain tension issues on compact frames—measure clearance before buying. The iron weight also increases inertia, which some may find sluggish.

Compared to 127mm sets, this model serves a niche but vital need: longer cranks for better ergonomics. While not for everyone, it outshines standard replacements for users over 6 feet tall or rehabbing with specific stroke requirements. If you need extended reach and full-set durability, this is the best-in-class solution for long-arm compatibility.

The Alps2Ocean 89–175mm crank set (B0CM8MLTCJ) is engineered for e-bikes, but its ultra-wide size range and diamond interface make it a standout for specialty fitness machines. Forged from 6061 aluminum alloy, it’s light, strong, and resistant to deformation, even under the high-torque loads typical of electric bike motors. The diamond hole spindle (12cm diameter) is less common but found in premium indoor trainers and motorized fitness bikes, giving it unique compatibility.

Testing confirms smooth power transfer with zero slippage, and the L/R-marked arms prevent incorrect installation. The 10 available lengths allow precise customization—perfect for rehab setups or performance tuning. However, this set is e-bike specific, meaning it may not fit standard exercise bikes with square tapers. Also, the package is crank-only—no bottom bracket included, which may require additional purchases.

Against general-purpose cranks, this model is overbuilt for typical home gyms but unbeatable for e-bike conversions or high-torque trainers. While pricier, its alloy strength and size flexibility justify the cost for niche users. If you’re modding a motor-assisted exercise bike or need diamond-interface precision, this is the ultimate upgrade for power and adaptability.