Aftermarket 1/5th Scale RC Parts: What to Upgrade and How to Choose

Aftermarket 1/5th scale parts are replacement or upgrade components made by a company other than your model's original manufacturer. You'd consider them when a stock part fails repeatedly, flexes under load, or when you want a specific behavior change — more durability, less weight, or easier servicing. The main decision is fitment: parts are usually model-specific (HPI Baja 5B/5T/5SC, Losi 5ive-T/2.0, MCD, Redcat Rampage, Vekta.5/TT), so confirm the part number matches your chassis before anything else.

What "aftermarket" actually covers in 1/5th scale

At this scale, the stock parts that most often get replaced fall into a few categories. Vertigo Performance's catalog, used here as a concrete example, organizes them roughly this way:

The pattern: each part maps to a known weak point or a servicing annoyance, not to a generic "performance" claim.

Choosing by material: aluminum vs carbon fibre vs Delrin

Material choice is the second decision after fitment, and it's a trade-off rather than a ranking.

• 6061 aircraft-grade aluminum — used in parts like the 130665 clutch carrier. Good strength-to-weight for load-bearing parts (carriers, braces, clutch housings). Heavier than carbon, but tolerates heat and impact better in drivetrain areas.
• Carbon fibre — lighter, stiff, good for flat structural pieces. Less forgiving of point impacts and abrasion; not the first choice where a part rubs or takes direct hits.
• Delrin — used for skid plates. Sacrificial and slippery; it wears instead of the chassis. Cheap to replace, which is the point.

A practical rule: aluminum for parts that carry torque or heat, carbon for stiffness where weight matters, Delrin for anything designed to be scraped.

Where the money actually goes: specials and factory seconds

Two options on this site are worth understanding before paying full price:

• Factory seconds — same part, cosmetic or minor defect, sold cheaper. Examples from the listing: 130665FS Clutch carrier unit Vekta.5 at $250.00 (from $375.00), and 61680 Easy Access Clutch Carrier for HPI Baja at $100.00 (from $170.00). If the defect is cosmetic and the part is structural, this is usually the best value in the catalog.
• Monthly specials — rotating discounts, sometimes steep. The September listing shows a Delrin rear skid plate at $4.95 (from $19.95, 75% off) and titanium tie rods at $26.00 (from $65.00, 60% off).

Prices shown are from the site's featured and specials listings and change over time — treat them as examples of the discount range, not current quotes.

Before you buy: the fitment checklist

1. Match the model exactly. "Losi 5ive-T 1.0/2.0" is not the same as DBXL; "HPI Baja 5B" parts don't automatically fit 5T/5SC without checking.
2. Read the part description for engine/chassis qualifiers. For example, the 91658 vented clutch housing kit is listed for "all models with 23cc–29cc" engines — outside that range, verify.
3. Check the instructions page. The site lists an Instructions link; use it for installation steps rather than guessing at torque or orientation.
4. Confirm the part number against your exploded view before ordering, especially for drivetrain parts where a near-miss causes damage.
5. For factory seconds, ask what the defect is if it isn't stated — cosmetic is fine, dimensional is not.

When upgrading is worth it — and when it isn't

Upgrade when you have a repeat failure (clutch carriers and chassis braces are the common ones), when servicing access is the bottleneck (an "easy access" carrier pays for itself in saved teardown time), or when you're chasing weight in a class where it matters.

Skip it when the stock part is holding up fine, when you haven't confirmed fitment, or when the upgrade moves stress to a weaker stock part downstream — a stiffer brace can transfer load to the next component in line. In that case, plan the whole chain, not one part.