How many tire orders does a three-bay shop need?
Calculate three-bay tire-shop break-even from a weighted vehicle order, contribution margin, bay capacity, staffing, inventory, safety and local rules.
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A three-bay tire shop in the StartFigures case needs about 7.51 completed and collected vehicle orders per trading day to cover mature operating costs. Because orders are whole and the actual tire-and-service mix varies, eight is the practical simplified threshold. The Year-three plan uses 12 orders per day, which only works if those orders fit the available technician, bay, tire-changing, balancing and alignment capacity.
The base case uses a $650 weighted retained order, 45% contribution margin, $57,083 of monthly fixed cost, six trading days per week and 4.33 weeks per month. Every one of those figures is an authored assumption. None is a national price, observed shop margin or local demand forecast.
The operating scope is an independent leased U.S. shop serving passenger vehicles and light trucks. It sells new tires and performs mounting, balancing, puncture repair, rotations, TPMS service and wheel alignment. Retreading, heavy commercial-truck tires, towing, roadside work, broad mechanical repair and jurisdiction-specific inspection work remain outside the case unless separately authorized, staffed, equipped, insured and modeled.
Define a completed vehicle order
A website visit, phone quote, booked appointment, tire deposit or vehicle arrival is not a completed order. The order closes only when:
- the vehicle, tire, wheel and authorized service scope are documented;
- the correct items are received or taken from controlled stock;
- the supported tire and service lines are completed and quality-checked;
- tire units, direct cost, technician time and bay time are recorded;
- discounts, returns, rebates, credits, fees, tax treatment and rework remain visible;
- the customer receives the vehicle and the invoice is collected, or a documented receivable stays open.
This definition prevents two common modeling errors. First, four tires on one vehicle are units, not four customer orders. Second, a comeback or warranty correction does not become a second sale simply because it occupies a bay again.
Build the $650 weighted order
The StartFigures case uses four mutually exclusive completed outcomes. Retained order value excludes sales tax and true pass-through amounts. It includes the revenue the shop keeps before the modeled sales-linked cost pool.
| Completed outcome | Mix | Retained order | Weighted value |
|---|---|---|---|
| Minor tire service | 25% | $150 | $37.50 |
| Two-tire installed order | 25% | $500 | $125.00 |
| Four-tire installed order | 40% | $950 | $380.00 |
| Four tires plus alignment, TPMS or supported additions | 10% | $1,075 | $107.50 |
| Weighted retained vehicle order | 100% | — | $650.00 |
This is a planning mix, not a price list. Each local invoice should separate the tire SKU and quantity, landed tire cost, installation and balancing, valves or TPMS parts, alignment or repair work, statutory or environmental fees, discounts, sales tax, credits and collection. A competitor's tire-only advertisement cannot be compared with an installed order until the scope and final written price match.
Calculate operating break-even
The model assigns 55% of retained revenue to tire inventory, valves, weights, service consumables, card fees and other sales-linked leakage. At $650 per order, that is $357.50, leaving $292.50 of contribution per completed order.
Year-three paid payroll is $370,000. Rent, utilities, equipment, insurance, software, marketing and other overhead are $315,000. Together, those mature fixed operating costs are $685,000 per year, represented as $57,083 per month in the calculator.
$57,083 ÷ $292.50 ÷ 6 ÷ 4.33 = 7.51 completed orders per day. Eight is the practical whole-order threshold in this simplified view.
At 12 completed orders, monthly retained revenue is 12 × $650 × 6 × 4.33 = $202,644. Contribution is $91,190, leaving a simplified $34,107 monthly operating surplus before depreciation, financing, income tax, replacement capital and owner distributions.
The annual Year-three case uses 50 trading weeks rather than 51.96. It produces $2.34 million of revenue, $1.053 million of contribution and a $368,000 operating result before the same exclusions.
Stress order value, margin and fixed cost
All cases use $57,083 of monthly fixed cost except the higher-fixed-cost row, which uses $65,000.
| Case | Order value | Contribution margin | Orders/day |
|---|---|---|---|
| Service-heavy lower order | $350 | 50% | 12.56 |
| Lower landed margin | $650 | 38% | 8.90 |
| Base | $650 | 45% | 7.51 |
| Higher fixed cost | $650 | 45% | 8.55 |
| Higher installed order | $850 | 45% | 5.74 |
The sensitivity explains why daily car count alone is incomplete. A service-heavy day may move many vehicles while leaving too little contribution. A high-value four-tire day may show strong revenue while consuming more inventory cash, technician time and constrained equipment. The order record needs both dollars and physical workload.
Reconcile 12 orders to three bays
The following table is an illustrative time-study design. It applies the same 25% / 25% / 40% / 10% mix to a 20-order block, then converts the weighted minutes to a 12-order day. The minutes are assumptions, not labor standards.
| Order class | Orders in 20 | Tech min./order | Total tech min. |
|---|---|---|---|
| Minor tire service | 5 | 45 | 225 |
| Two-tire installed | 5 | 75 | 375 |
| Four-tire installed | 8 | 120 | 960 |
| Four tires plus supported additions | 2 | 180 | 360 |
| Twenty-order block | 20 | 96 weighted | 1,920 |
| Equivalent 12-order day | 12 | — | 1,152 |
| Order class | Orders in 20 | Bay min./order | Total bay min. |
|---|---|---|---|
| Minor tire service | 5 | 35 | 175 |
| Two-tire installed | 5 | 60 | 300 |
| Four-tire installed | 8 | 90 | 720 |
| Four tires plus supported additions | 2 | 150 | 300 |
| Twenty-order block | 20 | 74.75 weighted | 1,495 |
| Equivalent 12-order day | 12 | — | 897 |
Three technicians provide 1,440 paid minutes in an eight-hour shift before breaks, training, cleanup, customer questions, receiving, tool maintenance and interruptions. Three bays also provide 1,440 scheduled bay minutes, but one alignment rack, tire changer or balancer may become the real constraint. Appointment waves can leave one asset overloaded while another bay stands open.
The pilot should record arrival, authorization, tire staging, lift or floor position, changing, balancing, alignment, TPMS work, quality check, customer handoff and cleanup. Record waiting time caused by missing tires, customer decisions, parts, approvals and rework. Twelve orders become a supported target only when the measured mix fits the staffed day without routine overtime or skipped controls.
Build an inventory ledger before buying depth
The $170,000 opening inventory allocation is authored. It does not establish which sizes, speed and load ratings, brands or price tiers should be stocked. The minimum useful ledger connects physical units to cash and orders.
| Field | Decision supported | Evidence |
|---|---|---|
| SKU, size and category | Defines exactly what can be sold | Supplier record and physical count |
| Landed unit cost | Measures gross contribution | Invoice, freight, rebate and credit |
| Receipt, sale and return dates | Measures turns and aging | Receiving and invoice records |
| Quoted versus filled demand | Tests assortment and stockouts | Quote log, lost-sale reason and order |
| Special-order deposit and terms | Controls cancellation and cash risk | Written customer and supplier terms |
| Shrink, damage and obsolete stock | Captures inventory leakage | Cycle count and adjustment approval |
Stock depth should follow paid demand and supplier performance. A distributor's catalog availability is not the same as a promised delivery time, return right or customer-ready tire. A fast turn with poor landed margin can be as damaging as a slow turn with too much cash committed.
Treat tire selection and rim service as controlled work
NHTSA advises using the tire size specified on the vehicle label or in the owner's manual, balancing new tires during installation, checking alignment where vehicle tracking or tire life indicates a need, and rotating tires to reduce irregular wear. Those points support the service workflow; they do not replace vehicle, tire or equipment instructions. NHTSA TireWise.
OSHA's rim-wheel standard requires covered employers to provide training, evaluate proficiency and supply safe procedures and equipment. The standard addresses restraining devices or barriers, clip-on chucks, in-line valves and gauges, manuals or charts, component inspection and staying outside the trajectory during inflation. The exact wheel and task determine what applies. OSHA 29 CFR 1910.177.
The shop should stop when tire fitment, wheel condition, component compatibility, pressure, load, procedure, equipment or worker proficiency is uncertain. Daily throughput never justifies bypassing inspection, restraint, inflation or final-check controls.
Verify state and local operating requirements
Census classifies Tire Dealers under 2022 NAICS 441340, including businesses that combine new-tire retail with automotive repair. Tire retreading and wholesale tire distribution sit in other industries, which supports keeping them outside this case. Census NAICS 441340.
Registration, repair authorization, tax, tire fees, waste storage and hauling vary by jurisdiction. California provides three examples:
- its Bureau of Automotive Repair says a business diagnosing, servicing or repairing motor vehicles for compensation must register as an automotive repair dealer and currently lists $200 application and annual renewal fees (California BAR);
- its tax agency lists a $1.75 fee per new tire and related retailer duties (California tire-fee rates);
- CalRecycle describes waste-tire generator records, registered haulers, identification and receipt retention (CalRecycle generator requirements).
These are state examples, not a national checklist or permission to operate elsewhere. The lease gate needs the actual city, county and state requirements for automotive use, repair orders, sales and tire fees, waste tires, fire and building review, signage, equipment, drainage, insurance and worker safety.
Use national data as context, not a local forecast
The 2023 Annual Integrated Economic Survey reports about $44.803 billion of sales, $8.603 billion of annual payroll and 171,139 employees for national Tire Dealers under the older 2017 NAICS 441320 classification. The current 2022 code is 441340. This establishes a large operating category but says nothing about traffic, competitors, tire sizes, prices, margins or available sites in one trade area. Census AIES Tire Dealers.
BLS reports a May 2025 national median annual wage of $50,620 for automotive service technicians and mechanics. The occupation includes work beyond tire service and the figure does not set a local offer. The $370,000 Year-three payroll must be rebuilt with local roles, pay, overtime, employer taxes, workers' compensation, benefits, training and leave. BLS automotive service technicians.
Obtain complete installed equipment quotes
When accessed, BendPak displayed a tire-changer and wheel-balancer package at $10,795 and alignment-lift examples from $11,615 to $23,805. Those prices show that major components are commercially available, but they do not validate the $140,000 equipment allocation. A complete quote needs the selected machines, lifts, alignment measurement system, compressor and air treatment, tools, TPMS equipment, freight, unloading, anchoring, electrical work, compressed-air distribution, permits, commissioning, calibration, training, warranty and service. BendPak changer and balancer and BendPak alignment lifts.
The same rule applies to the site. A quoted rent per square foot does not include automotive-use approval, common-area charges, taxes, insurance, utility upgrades, drainage, ventilation, signage, deposits, construction, downtime or restoration obligations.
Bridge the public order to the paid workbook
The verified Tire Shop financial model has a high-confidence retail structure. Daily store visitors and seasonality create traffic; conversion creates new buyers; repeat-buyer share, lifetime and frequency create active cohorts and repeat orders; orders become units; category mix and category prices create revenue.
That architecture fits a tire retailer, but the public $650 vehicle order still needs a careful bridge:
- reconcile phone, web, walk-in and fleet leads to one traffic definition;
- connect quotes and arrivals to first-time and repeat completed buyers;
- split each vehicle order into tire units and service lines;
- assign category prices and landed costs consistently;
- keep taxes and true pass-through fees outside retained revenue;
- reconcile orders to technician, bay, changer, balancer and alignment minutes.
Do not invent repeat buyers to smooth revenue, and do not force service labor into a tire category without a documented rule. The Tire Shop financial model page explains the inputs, outputs and capacity boundary.
Read the five-year case
| Year | Completed orders/day | Revenue | Operating result |
|---|---|---|---|
| 1 | 6 | $1,170,000 | -$43,500 |
| 2 | 9 | $1,755,000 | $159,750 |
| 3 | 12 | $2,340,000 | $368,000 |
| 4 | 14 | $2,730,000 | $468,500 |
| 5 | 16 | $3,120,000 | $544,000 |
| Year | Sales-linked costs | Payroll | Other overhead |
|---|---|---|---|
| 1 | $643,500 | $285,000 | $285,000 |
| 2 | $965,250 | $330,000 | $300,000 |
| 3 | $1,287,000 | $370,000 | $315,000 |
| 4 | $1,501,500 | $420,000 | $340,000 |
| 5 | $1,716,000 | $480,000 | $380,000 |
Years four and five are not automatic growth. Fourteen or 16 daily orders need a measured faster mix, longer staffed hours, better equipment utilization or funded capacity. The operating result excludes depreciation, financing, income tax, replacement capital, working-capital timing and distributions. The $150,000 reserve does not prove month-by-month cash sufficiency after site work and inventory are paid.
The next test is 60 paid orders within a narrow supported tire and service range. Record channel and visitor definition, quote, conversion, first or repeat buyer, tire SKU and units, service lines, retained invoice, landed cost, technician minutes, bay and equipment minutes, delay, rework, warranty, credit and collection. Sign the full lease and buy deeper inventory only when those records agree with the cash schedule.
The Tire Shop case contains the full opening allocation and forecast. Its evidence register separates sources from assumptions, while the business plan and financial model show how the public case connects to the verified paid products.