24 Hours of LeMons Roll Cage Guide: CageKits vs TrackSpec and What Actually Matters

What 24 Hours of LeMons Actually Requires

Before comparing brands, nail down what the rulebook demands. LeMons mandates a full front and rear hoop, braced together along the roofline, with dual door bars on each side. You need at least two main-hoop backstays angled as close to 45 degrees as practical, plus a main-hoop diagonal, spreader plates, gussets, and complete 360-degree welds at every joint — including all car-to-cage joints.

Tube size depends on the car’s weight as raced. Under 3,000 lbs, the minimum is 1.50" × .120" or 1.75" × .095". Over 3,000 lbs, you need at least 1.75" × .120". All major load-bearing members must be formed from a single continuous tube — no splices through the main structure.

Head clearance is non-negotiable: every driver’s helmeted head must sit at least two inches inside the cage on all sides. A shoulder-harness bar is required in nearly every build, and the attachment point must fall between zero and 15 degrees lower than the harness’s seat-entry point. LeMons strongly encourages a dash bar too.

CageKits and TrackSpec: The Basics

Both CageKits and TrackSpec manufacture pre-bent, vehicle-specific weld-in cage kits using modern CNC tooling. That matters more than it sounds. A scratch-built cage requires hand measuring, bending, notching, and fitting — skilled work that takes considerable time even for an experienced fabricator. Vorshlag Motorsports documented their experience installing a TrackSpec kit on a 2015 Mustang: every tube fit tight to the chassis with notches already aligned, and the whole job came in around 15 hours. A comparable scratch build would have taken far longer.

CageKits uses 3D scanning, laser notching, and CNC bending to achieve fit. Each piece is laser-etched and labeled, which simplifies installation sequencing for the fabricator. TrackSpec takes a similar approach — tubes are CNC marked and numbered in installation order, with fish-mouth marks at intersecting points to guide alignment. TrackSpec states their kits meet or exceed SCCA, NASA, and NHRA roll cage specifications.

Both brands offer DOM mild steel as the standard material. DOM (Drawn Over Mandrel) tubing has higher yield and tensile strength than basic ERW or HREW tube, and it is what most sanctioning bodies — including LeMons — consider the baseline acceptable material for cage construction.

The Part Most People Skip: The Welder

A cage kit gets you pre-bent tubes. A safe cage is what happens at the welder’s hands.

Poor weld penetration, incomplete fusion, or porosity at tube joints are invisible until something goes very wrong. Experienced fabricators in the motorsport community have documented pulling cages from cars that looked fine visually but were built so poorly the structure would have transferred crash energy directly into the driver instead of absorbing and dispersing it. A premium kit ruined by a bad weld job is worse than nothing.

TIG welding is preferable for cage work. The foot-pedal heat control lets a skilled operator fully heat a joint before laying a bead, producing more consistent penetration than MIG. MIG can work, but it demands a capable machine and someone experienced on round tubing — which is harder to weld cleanly than flat stock. Suspiciously fast turnaround quote? Underpowered welder in a cold garage? Both are worth pausing on.

Before handing over a kit, ask any prospective fabricator: Have they built full cages before? TIG or MIG? Can they show finished work? Some sanctioning bodies require weld sample submission before a fabricator can install competition cages. A welder who has gone through that process understands what the standard actually looks like — and one who hasn’t usually shows it in the work.

DOM vs Chromoly: Does It Matter at LeMons?

Chromoly (4130 alloy steel) is stronger per pound than DOM mild steel, which is why thinner wall tubing can achieve equivalent strength — and where the weight savings come from. The tradeoffs are real: chromoly must be TIG welded and ideally heat-treated after welding to relieve residual stress. It also costs more per foot than DOM.

For most LeMons teams, chromoly is not a meaningful upgrade. The rules are written around DOM mild steel minimums. LeMons cars are almost universally heavy street vehicles, so the weight savings are small relative to total car mass. More importantly, the added welding complexity increases risk if your fabricator isn’t experienced with 4130. DOM, welded properly by someone who knows what they’re doing, is exactly what LeMons intends.

Bolt-In vs Weld-In

TrackSpec also sells bolt-in roll bars, separate from their weld-in cage kits. For LeMons, these are not a substitute. The series requires a full weld-in cage with dual door bars on each side and properly braced front and rear hoops. Bolt-in connections at structural cage points do not comply with that standard. If you are building a dedicated LeMons car, you want a full weld-in kit — not a bolt-in bar.

Getting Through Tech

LeMons tech inspection is thorough. Inspectors check head clearance with the helmet on at every seating position, verify door bar geometry and hoop angles, and look at weld quality. A cage that looks right across the garage can still fail if tube gaps appear at gussets, welds show porosity, or the geometry doesn’t meet the two-inch clearance rule with a helmet actually in place. Build it right the first time — tear-out and redo under a race deadline is expensive, slow, and miserable.

Order the kit early. Both CageKits and TrackSpec ship vehicle-specific kits, so confirm your model year and trim fitment before ordering. Line up your fabricator while the kit is in transit — good fabricators book out, and you do not want the kit sitting in a corner for two months.

Sources

• 24hoursoflemons.com
• 24hoursoflemons.com
• vorshlag.com
• trackspecmotorsports.com
• cagekits.org
• performanceracing.com
• mgmtautoworks.com
• grassrootsmotorsports.com