Hardware Kits - Other

Hardware Kits - Other is the broadest and most build-critical category in motorsport parts — covering everything from precision engine bearings and crankshaft hardware to wiring harnesses, CVT belts, mount sets, and drivetrain fasteners that directly determine whether a build holds together at the limit. Motor Sport Mayhem stocks 602 in-stock products across 161 brands, ranging from budget-entry consumables to full professional race-grade hardware used in championship-level competition.

Our Top Picks for Hardware Kits - Other

Every product below was selected based on verified performance credentials, engineering specifications, and real-world results across street, track, and full competition applications.

How to Choose the Right Hardware Kits - Other

The Hardware Kits - Other category spans dozens of sub-types — engine bearings, crankshaft accessories, wiring harnesses, drivetrain hardware, mount sets, belts, and more — and the variables that separate adequate from race-proven differ completely by application. What they share is this: tolerance precision, material grade, and thermal rating are the specifications that actually matter, and OEM-equivalent is rarely the right benchmark when power output, operating temperature, or load cycles increase beyond stock parameters.

Key Specifications

For rotating assembly hardware — bearings, crankshaft components, and related fasteners — the critical specifications are oil clearance, surface hardness, and bearing overlay composition. Tri-metal bearings with a copper-lead intermediate layer and a soft overlay alloy tolerate momentary oil starvation and debris passage better than bimetal designs. When power output rises and oil temperatures climb, standard clearance bearings can hydroplane at peak RPM; extra clearance specs maintain the oil wedge needed to prevent metal-to-metal contact. Always cross-reference bearing clearance against oil viscosity — tighter clearances demand lower-viscosity oil to maintain adequate flow, while extra clearance bearings typically call for higher-viscosity lubricants.

Wiring kits and harness components are frequently underspecified in performance builds with the assumption that any wire of the correct gauge will do. Conductor quality — oxygen-free copper versus standard copper alloy — directly affects resistance over the wire's length, and resistance means voltage drop, which means sensors read inaccurately, fuel pumps underperform, and ignition systems fire with reduced energy. For high-draw components like fuel pumps and electric fans, dedicated relayed circuits with correctly rated fuse protection are not optional. Pre-terminated harness kits from engineering-focused brands solve this problem by ensuring correct gauge, insulation temperature rating, and connector integrity from the factory.

Mount hardware, CVT belts, and chassis fasteners share a common failure mode: fatigue from cyclical loading. A mount set or fastener that holds under static load will fail prematurely if its material grade cannot handle the repeated stress reversals of performance driving. For mounts, durometer rating and material type — polyurethane versus rubber versus solid — determine both NVH characteristics and deflection under cornering loads. For CVT belts, cog geometry, compound durometer, and reinforcement cord type determine how much peak torque the belt transmits before delamination or cord separation occurs. Higher-power CVT applications require belts specifically rated for elevated torque multiplication.

Crank pulleys and accessory drive components sit at the intersection of weight reduction and reliability. A lightened pulley reduces reciprocating mass and improves throttle response, but underdamped or improperly sized pulleys can introduce harmonic vibration that accelerates front main seal and timing component wear. Confirm that any lightened pulley maintains correct accessory belt width and tension geometry before installation, and verify that it is compatible with any harmonic balancer requirements specific to your bottom-end build.

Engine Bearing Clearance vs. Application Reference

Price Guide

Entry ($1.19–$130): Pilot bearings, individual fasteners, small wiring connectors, replacement CVT belts for light-use machines, and basic clutch accessories fall in this range. These are typically application-specific consumables — get the correct spec, confirm fitment, and they perform the job reliably. Do not compromise on bearing overlay quality or wire gauge even at the low end of the price range.

Mid-range ($130–$450): This is where most enthusiast builds concentrate — full main and rod bearing sets, wiring harness kits, subframe mounts, thermocouple sensor kits, and lightened rotating accessories. At this price point, you're getting engineered solutions from brands with race validation behind them, not just OEM substitutes. The improvement in surface treatment, tolerance consistency, and thermal rating over budget alternatives is measurable on a dyno and in a lap time.

Premium ($450–$11,495.95): Full competition bearing sets, complete chassis wiring systems, professional data acquisition hardware integration kits, and specialized fastener packages for purpose-built race engines populate the upper tier. Builders running sustained high-boost applications, endurance racing, or pro-level drag programs require the metallurgical specifications and quality control that justify premium pricing — field failures at this level cost far more than the parts themselves.

Who Is This For?

Hardware Kits - Other serves a wide spectrum of builders — from weekend autocrossers doing their first bearing refresh to professional race teams building engines from scratch — and the usage data reflects that diversity clearly.

Engine Performance — 8.5/10

This category scores highest for engine performance applications, and that makes sense given how much of the catalog is rotating assembly hardware. Bearings, crankshaft accessories, and precision fasteners are the foundation of any serious engine build — they determine how much power the assembly can sustain, not just produce. For anyone building an engine beyond OEM power levels, these are not optional upgrades; they are load-path components that define the build's ceiling.

Racing Competition — 8.2/10

Competition applications demand components that maintain specification across thermal cycles, fuel chemistry changes, and sustained high-RPM operation that street hardware simply isn't designed to withstand. Race-spec bearings, wiring systems rated for engine bay temperatures, and properly engineered mount hardware are all mission-critical in a competition environment. The 191 products in this usage tier reflect the breadth of what a complete race build actually requires beyond the headline components.

Track / Autocross — 8.2/10

Track and autocross use creates specific stress patterns that OEM hardware doesn't anticipate — sustained lateral loads on mount hardware, repeated heat cycles through the drivetrain, and oil temperature spikes that compromise standard bearing clearances. Upgrading hardware kits for track use is often the difference between an engine that survives a full season and one that requires a teardown after six events. Even modest track use justifies the step up to race-spec bearings and proper wiring solutions for any added instrumentation or fuel system upgrades.

Drag Racing — 8.2/10

Drag racing imposes peak instantaneous loads that sustained-use applications never see — launch shock through the drivetrain, momentary oil starvation at high RPM during the hit, and extreme cylinder pressure events in boosted applications. Hardware kits in this environment need to be sized for peak load, not average load, which means extra-clearance bearings, high-torque-rated CVT and accessory belt components, and wiring systems that maintain voltage to fuel delivery without sag during peak demand.

Street Performance — 7.6/10

Street performance applications score slightly lower because OEM hardware often survives mild power increases without catastrophic failure — the degradation is gradual rather than sudden. However, 7.6 out of 10 still indicates high relevance; enthusiasts running forced induction upgrades, aggressive camshaft profiles, or high-compression builds on street engines need bearing and hardware specifications that account for increased cylinder pressures and elevated oil temperatures that stock hardware was never engineered to handle long-term.

Trusted Hardware Kits - Other Brands We Carry

The brands dominating this category earned their positions through engineering credentials and race-proven track records, not just marketing. ACL has supplied tri-metal bearing sets to professional motorsport programs globally for decades, with a coated race series that extends fatigue life under sustained high-load operation. King Engine Bearings is an OEM-tier supplier to several major manufacturers whose aftermarket race line carries tighter tolerance control than most competitors offer at any price point. ARP defines the fastener standard in performance engine building — their aerospace-grade alloy bolts and studs are specified by engine builders at every level from amateur club racing to factory-backed motorsport. Aeromotive brings the same engineering discipline to fuel system wiring that they apply to fuel pump and regulator design, ensuring that electrical delivery matches flow delivery at peak demand. GSC Power Division and Brian Crower bring valvetrain hardware engineering to the mix, supplying components designed around the thermal and mechanical loads of high-lift, high-RPM operation that OEM valvetrain hardware cannot reliably survive. All Balls Racing rounds out the drivetrain hardware side with bearing and CVT solutions validated across off-road and performance powersport applications where failure consequences are immediate and severe.

Frequently Asked Questions

Are ACL or King bearings better for high-performance engine builds?

Both ACL and King Engine Bearings are legitimate race-quality tri-metal bearings used at the professional level, and choosing between them often comes down to application-specific clearance availability and overlay coating preferences rather than one brand being categorically superior. ACL's race series features a distinct overlay compound optimized for sustained high-temperature operation and is available in extra-clearance sizing for boosted applications. King's performance line carries extremely tight dimensional tolerances derived from their OEM manufacturing background, which translates to more consistent crush and oil film behavior across a set. For high-boost street or track engines, both brands outperform any OEM bearing by a significant margin — the decision typically comes down to which brand offers the correct clearance specification for your particular block and crankshaft journal dimensions.

Are ACL race bearings coated, and does the coating actually matter?

ACL's Race Series bearings use a polymer-based coating on the overlay surface that reduces friction during initial startup and provides a sacrificial layer during brief oil starvation events — both critical failure points in performance engines. The coating does matter in practice: uncoated bearings in a high-RPM engine experience the most wear during cold starts before full oil pressure is established, and the ACL coating measurably reduces this startup wear cycle. For engines that see frequent cold starts followed by immediate hard use — track days, for example — coated bearings extend service life noticeably compared to uncoated alternatives at similar clearance specifications. The coating does not compensate for incorrect oil clearance or inadequate lubrication system capacity, so it should be viewed as a complement to proper build specification rather than a substitute for it.

Are aftermarket head gaskets actually better than OEM?

For stock or near-stock applications, OEM head gaskets are engineered to exact factory tolerances and perform reliably within their design parameters — aftermarket is not automatically better in that context. Where aftermarket head gaskets become demonstrably superior is in modified engines with elevated cylinder pressure, increased bore diameters, or surface finish deviations from OEM specification. Multi-layer steel gaskets from performance-focused manufacturers offer higher clamp load tolerance, better sealing under thermal cycling, and fire ring geometry optimized for overbore applications where OEM gaskets would fail at the ring land. Composite gaskets, by contrast, compress permanently and cannot be re-torqued — for any engine seeing repeated heat cycles or elevated boost, MLS construction is the correct choice regardless of price premium. Always confirm that your deck surface finish matches the gasket manufacturer's specification, as MLS gaskets require a smoother surface finish than composite designs to seal correctly.

Are aftermarket belt tensioners worth installing on a performance build?

OEM belt tensioners are designed around factory belt load and accessory drive specifications — add a larger alternator, an upgraded power steering pump, or a performance supercharger drive and the OEM tensioner spring rate is no longer matched to the system load. Aftermarket tensioners for performance applications typically feature higher spring rate ratings, heavier-duty pivot bearings, and arm geometry recalibrated for modified accessory drive systems. The failure mode of an underrated tensioner is belt slip under load, which at best causes belt wear and at worst allows the drive belt to depart the engine bay at high RPM — a situation that causes immediate accessory and potentially engine damage. For any build that modifies the front accessory drive, a tensioner upgrade matched to the new belt load is a straightforward reliability investment with a clear technical rationale.

Are aftermarket ignition coils worth the upgrade over OEM?

OEM ignition coils are calibrated to fire factory fuel injector pulse widths at stock compression ratios — increase boost pressure, run ethanol blends, or extend injector pulse width for higher fuel flow, and OEM coils can misfire because the ionization energy required to initiate combustion in a denser charge exceeds what the factory coil can produce. Aftermarket performance coils increase primary winding energy storage, reduce internal resistance, and deliver higher peak spark energy and longer spark duration — all of which improve combustion efficiency in modified engines. The practical result is measurable: reduced misfire rates at high RPM, improved combustion completeness in lean conditions, and better cold-start performance. For naturally aspirated engines at stock tune, OEM coils are generally adequate; for anything running increased boost, aggressive cam timing, or alternative fuels, the upgrade to higher-output coils is a straightforward reliability and performance improvement that pairs correctly with any fuel system or engine management upgrade.

Building something specific? Our performance specialists can help you select the right Hardware Kits - Other for your application — street, track, or full race build.