Tire-Wheel
Trailer Tire Speed Rating Chart 2026: Complete ST Guide
ST trailer tire speed ratings explained: no symbol = 65 mph, L, M and N letters, the 10 psi rule above 65 mph, and real examples from Goodyear and Carlstar.
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Tire-Wheel
Penny Tire Tread Depth Chart 2026: Complete Coin Test Guide
Penny and quarter tread depth tests explained: 32nds to mm chart, legal minimums and wet-braking data from Tire Rack, AAA and Consumer Reports.
Parts Cross-Reference
Serpentine Belt Size: How to Measure It and Read the Code
Rib count and effective length decide the fit. How belt codes are read, how to measure with the tensioner in range, and why a near-miss belt fails.
Parts Cross-Reference
National Oil Seal Cross Reference Chart 2026: Complete Guide
National oil seal styles crossed to CR/SKF, NOK, Freudenberg and more, plus how to read National part numbers, from Timken's catalog.
Battery Charts
John Deere Battery Size Chart 2026: Complete Group Guide
Official John Deere battery sizes by model: BCI group, part number, CCA, RC and Ah from Deere's battery guide and parts guides.
Spark Plug Charts
Briggs and Stratton Spark Plug Chart 2026: Official Gaps
Briggs & Stratton's official spark plug part numbers and gaps for flathead and OHV engines, plus the Quantum .020 in exception decoded.
Parts Cross-Reference
Salvage Yard Interchange: Why Fits Is Not a Guarantee
A yard's interchange match says a part group bolts in. It does not promise your options, connectors or build date. What to check before you drive out.
Lug Pattern, Torque & Fasteners
5 Lug Bolt Pattern Chart 2026: Complete mm to Inch Guide
Every common 5-lug bolt pattern in mm and inches, the stud spacing you can actually measure, and why 5x114.3 is not 5x115.
Trim, Model & Generation Comparison
Harley-Davidson Models Chart 2026: Complete Lineup & Specs
All 25 2026 Harley-Davidson models in one chart: family, engine, horsepower, torque, weight and starting price, plus power-to-weight analysis.
Parts Cross-Reference
OEM vs OES vs Aftermarket Parts: What Each Word Means
OEM, OES and aftermarket describe who made and who branded a part, not how good it is. What each label promises, what it does not, and how to check.
Lug Pattern, Torque & Fasteners
Socket Size Chart Metric and Standard 2026: Complete Guide
Exact SAE-to-metric socket sizes, the few pairs that really swap (3/4 in vs 19 mm), and which socket fits each metric and inch bolt head.
Tire-Wheel
Trailer Tire Load Range Chart 2026: Complete PSI & Ply Guide
ST trailer tire load ranges B to G with ply rating, max cold PSI and real load ratings from Goodyear, Carlisle and Duraturn.