34 true-scale printable fabrication templates — every tube miter, gusset, engine mount, suspension piece, roll cage joint, and full-size jig layout you need to build a cross kart frame from scratch.
Every template in one download — chassis rails, roll cage, suspension, bumpers, engine mounts, gussets, flat plates, and the full-size jig layout. Save over 50%.
Organized by build stage — start with chassis rails, add the roll cage, then suspension, bumpers, and finishing hardware.
Research-based specifications from real cross kart builds, SCCA regulations, and off-road racing engineering data.
| Parameter | Range (inches) | Range (mm) | Notes |
|---|---|---|---|
| Wheelbase | 81.9"–84" | 2,080–2,134 | Longer = stability at speed; shorter = agility |
| Track Width (Front) | 49.2"–59" | 1,250–1,500 | Wider = better off-road stability |
| Track Width (Rear) | 49.2"–59" | 1,250–1,500 | Match or slightly wider than front |
| Overall Length | 102"–110" | 2,590–2,800 | Chassis design dependent |
| Overall Width | 36"–59" | 914–1,500 | At widest point (bumpers/nerf bars) |
| Overall Height | ~56.4" | ~1,433 | Affects center of gravity — lower is better |
| Application | Tube OD | Wall Thickness | Material |
|---|---|---|---|
| Main frame rails / roll cage | 1.5" | .095"–.120" | DOM 1020 mild steel or 4130 chromoly |
| Crossmembers / door bars | 1.25" | .083"–.095" | DOM 1020 — lighter secondary members |
| Diagonal braces / nerf bars | 1.0" | .083"–.095" | DOM 1020 — triangulation members |
| A-arms / suspension | 1.0"–1.25" | .120" | 4130 Chromoly recommended — high stress |
| Parameter | Value | Notes |
|---|---|---|
| Upper A-arm angle (at ride height) | ~13° upward | Keep as horizontal as possible |
| Lower A-arm angle (at ride height) | ~16.5° upward | Carries majority of suspension load |
| Caster angle | 10°–15° | More = stronger self-centering, heavier steering |
| Static camber | 0° | Negative camber gain in compression |
| Kingpin inclination (KPI) | 14°–16° | Higher than road cars — maintains contact during roll |
| Ackermann angle | ~30° | Inner wheel turns more than outer in corners |
| Toe-in (static) | 1/8"–1/4" | Measured at rest, straight ahead |
| Minimum bend radius | 3× tube diameter | 4.5" CLR for 1.5" tubing — no crimping |
| Ratio | Lock-to-Lock | Characteristics | Best For |
|---|---|---|---|
| 3/4:1 | 3/4 turn (270°) | Very quick, twitchy | Mini buggies, trophy karts |
| 12:1 | ~2/3 turn | Fast response, more effort | Racing applications |
| 16:1 | 1–1.5 turns | Slower, stable | Heavy / high-speed karts |
| 20:1 | 1.5–2 turns | Smooth, less effort | Recreational karts |
| Front Sprocket | Rear Sprocket | Ratio | Use Case |
|---|---|---|---|
| 10–12T | 60–72T | 5.0–7.2:1 | Standard off-road — good acceleration |
| 12T | 54T | 4.5:1 | Higher top speed — long straights |
| 11T | 86T | 7.8:1 | Heavy acceleration, hill climbing |
Live axle setup: 1" axle standard, 3" bolt circle bearing mount, 3-hole flangette bearings. Mount bearings close to wheels and sprocket to prevent axle flex.
| Requirement | Specification |
|---|---|
| Minimum tubing (up to 1,000 lbs) | 1.00" × .065" or 1.25" × .049" |
| Minimum tubing (1,001–2,500 lbs) | 1.375" × .080" or 1.50" × .065" |
| Helmet clearance above main hoop | 2"–3" minimum |
| Main hoop construction | One continuous length — no crimping |
| Bend radius minimum | 3× tube diameter (centerline) |
| Material | Seamless or DOM mild steel (SAE 1010, 1020, 1025) or 4130 |
| Wall thickness tolerance | 0.010" variation allowed |
| Diagonal brace | Must join main hoop within 4" of backstay junction |
| Parameter | Value | Notes |
|---|---|---|
| Wheel travel | 6"–8" (150–200 mm) | Double A-arm independent, front & rear |
| Front shock length | 400–410 mm eye-to-eye | Öhlins AT 071/072, ProTech 400S, Diamond 400 |
| Rear shock length | 475–535 mm eye-to-eye | Öhlins AT 073/074, ProTech 600S |
| Spring rate (light build) | 10–14 N/mm (57–80 lbs/in) | Vehicle + driver under 350 kg |
| Spring rate (medium build) | 16–20 N/mm (91–114 lbs/in) | Vehicle + driver 350–450 kg |
| Spring rate (heavy build) | 22+ N/mm (125+ lbs/in) | Vehicle + driver over 450 kg |
| Spring I.D. (front) | 1.9" | ProTech 400S compatible |
| Spring I.D. (rear) | 2.25" | ProTech 600S compatible |
| Shock bearings | 1/2" spherical | Top and bottom mounting — FK or Aurora |
| Shock adjustability | Single or 3-way | Compression/rebound, 30-click spectrum common |
| Rear driveshaft | BMW E34 CV joints | Bolt-on CV — common for rear independent builds |
| Component | Specification | Notes |
|---|---|---|
| Rotor diameter | 190–200 mm (7.5"–8") | Drilled/slotted for cooling, stainless 420 (HRC 50+) |
| Rotor thickness | 3.5–4.9 mm | Hub-mounted with keyway and set screw |
| Front calipers | Wilwood PS-1 dual-piston | Floating or non-floating mount |
| Rear caliper | Honda PC35 single | Adapted motorcycle caliper — lightweight |
| Master cylinder bore | 7/8" (optimum) | 1" maximum for manual brakes |
| Pedal ratio | 4:1–7:1 (7:1 typical) | Higher ratio = less effort, longer stroke |
| Brake lines | Braided stainless steel | M10 banjo fittings, 34"–80" lengths |
| Brake fluid | DOT3 | Pre-filled kits available — no bleeding required |
| Item | Specification | Regulation |
|---|---|---|
| Helmet | Snell SA2020 or FIA 8860 | Mandatory — CMR2016 for youth ≤15 |
| Racing suit | FIA 8856-2000 fire-retardant | Nomex overalls with FIA approval marking |
| Gloves | SFI or FIA rated, Nomex | Fire-retardant racing gloves |
| Racing seat | FIA 8855-1999 | HANS compatible, integrated head support |
| Harness | 5-point minimum | Individual mount points, 8mm+ bolts, 3mm plate |
| Shoulder strap angle | 0° to -30° | From horizontal — critical for safety |
| Neck brace | Mandatory | HANS compatible recommended |
| Steering wheel | Quick-release hub | MANDATORY per FIA/SCCA regulations |
| Fire extinguisher | Min 1.5L handheld | Floor-mounted in front of driver seat |
| Fuel tank | Max 12L, outside cockpit | Heat shielded if within 20cm of exhaust |
| Side protection | 60% minimum coverage | Between wheels, both ends secured to chassis |
| Firewall | Mandatory barrier | Engine/cockpit separation — protects against leaks |
Skip the expensive equipment. Get print-ready 1:1 scale templates from your home printer.
A quality tube notcher costs $300–$600+. Our templates wrap around your tube — trace with a marker, cut on the line with a grinder or bandsaw. Perfect copes every time.
Stop measuring, marking, and re-measuring. Each template is pre-calculated and verified. Print, apply to material, cut. A frame that used to take a weekend of layout now takes hours.
Every template is digitally generated at true 1:1 scale. Calibration marks on every page let you verify your print before cutting. Always measure against your actual parts. Works on any home or office printer.
Templates are based on real cross kart engineering data — SCCA-compliant roll cage specs, proven suspension geometry (10°–15° caster, 14°–16° KPI), and industry-standard tube sizes.
Buy and download immediately. No waiting for shipping, no back-ordered parts. Start cutting today. Multi-page templates tile automatically for large parts like the full frame jig.
Predator 212 (6.5 HP budget), Honda GX390 (13 HP performance), and universal motorcycle engine (250–600cc). Each with correct bolt patterns and recommended sprocket ratios.
Tool checklist based on real cross kart builder research. Most builders already have 80% of this in their shop.
Upcoming events where PunchMapPro builders compete. Start building now so your kart is ready.
Cross-sell with your cross kart build — tube stencils for custom angles, gussets for reinforcement, and complete mini bike frame kits.
Get every template in one download and start cutting today. 34 templates covering every subsystem — chassis, roll cage, suspension, bumpers, mounts, gussets, plates, and jig layout.