Tire Shop input evidence register
44 financial inputs with their assumptions, calculation bases and cited sources.
Read the supported claim, observation period, geography and units together. A source access date records when it was consulted. A model assumption identifies a selected amount or target; a calculated result follows from those inputs and does not establish observed demand or a quoted opening budget.
Case updated October 4, 2026. These notes accompany the complete case methodology and source register.
Dataset use notice: no Creative Commons license or DOI is asserted. Referenced material remains subject to its publisher’s terms.
These notes explain the opening budget, annual forecast and calculator assumptions. Linked sources provide the support described in each note; they do not necessarily confirm the selected amounts. Check scenario assumptions against local quotes and operating records.
- Model assumption
Applies to: Total opening budget · Lower opening budget · Upper opening budget · Leasehold, electrical, compressed air, bay and site work · Tire, balancing, alignment, lift, compressor and tool systems · Opening tires, wheels, TPMS parts, weights and consumables · POS, phones, security, furniture and signage · Registration, insurance, deposits and professional fees · Preopening payroll, training and launch marketing · Working-capital reserve
Authored three-bay opening allocation. Current vendor pages anchor only selected machines and lifts, while SBA and the California example identify cost categories. They do not verify a complete site, equipment package, inventory, insurance or reserve.
- Model assumption
Applies to: Revenue (Years 1–5)
Authored completed-order path. Year three is 12 shop-wide orders × $650 × 6 days × 50 weeks. Census establishes the sector and the product establishes a retail revenue structure, but neither proves local traffic, conversion, order mix, price or collection.
- Model assumption
Applies to: Tire inventory, service materials, card fees and other sales-linked costs (Years 1–5)
Authored 55% pool for tire inventory, service materials, card fees and other sales-linked leakage. Statutory tire fees and waste handling need separate treatment; replace the pool with invoices, receipts, rebates, returns, credits, shrink and disposal records.
- Model assumption
Applies to: Paid owner-manager, service-advisor, technician and shop-support payroll (Years 1–5)
Authored paid owner-manager, service-advisor, technician and support schedule with employer-cost allowance. National occupation pay, federal payroll guidance and training duties are context only; local offers and staffing capacity are required. OSHA 1910.177's large-vehicle scope excludes automobile rims and pickup/van rims with automobile or LT tires; it does not verify routine service duties in this narrow passenger/light-truck case.
- Model assumption
Applies to: Rent, utilities, equipment, insurance, software, marketing and overhead (Years 1–5)
Authored rent, utilities, equipment, insurance, software, marketing and administration schedule. It is not a local lease, utilities, maintenance, insurance or advertising quote.
- Model assumption
Applies to: Retained sale per completed vehicle order (base scenario) · Retained sale per completed vehicle order (lower sensitivity) · Retained sale per completed vehicle order (upper sensitivity) · Shop-wide completed vehicle orders per trading day (base scenario) · Shop-wide completed vehicle orders per trading day (lower sensitivity) · Shop-wide completed vehicle orders per trading day (upper sensitivity) · Trading days per week (base scenario) · Trading days per week (lower sensitivity) · Trading days per week (upper sensitivity) · Monthly fixed operating costs · Contribution margin · Opening sales as a share of mature volume · Monthly increase toward mature volume · Forecast horizon (months)
Authored completed-vehicle-order break-even bridge. The $650 order, 12 orders, 45% contribution, six-day schedule, fixed cost and ramp must reconcile to visitors, conversion, tire units, service lines, direct costs, technician minutes, bay minutes, rework and collection. OSHA 1910.177's large-vehicle scope excludes automobile rims and pickup/van rims with automobile or LT tires; it does not verify routine service duties in this narrow passenger/light-truck case.