Cycling

Frame math, fit math.

Frame math, fit math.

Frame sizing by inseam, gear ratio analysis, and tire pressure math (much lower than you think). For road, gravel, and mountain riders who care about the numbers behind their setup.

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Calculators

Working tools that answer one specific question. No "sign up to see results." No upsell paywall.

Most used Frame Size Calculator Inseam, bike type (road/gravel/mountain), reach preference. Returns size range that fits — not the brand-marketing answer. Open calculator → Tire Pressure Calculator Silca formula by rider weight, tire width, surface (paved/gravel/dirt), tube vs tubeless. Lower than you think. Open calculator → Gear Ratio Calculator Chainring + cassette combos. Gear-inches and development output. For finding climbing gear gaps. Open calculator →

Real Gear Reviews

The cheap option is usually fine. When it isn't, this site says so. Reviews include real cost-of-ownership math, not "5 stars on Amazon" reasoning.

Cost analysis Tire pressure: the real-world chart, not the sidewall max Max PSI on the sidewall is for the tire's safety, not your comfort. The Silca-derived chart for road, gravel, and MTB by rider weight and surface. Gear review Bike upgrades ranked by speed-per-dollar (not bike-shop opinion) Carbon wheels are last, not first. The real priority: tires, fit, chain wax, then everything else. Lab-measured watts saved per dollar spent. Maintenance Indoor trainer buying guide: the honest tiers Wahoo Kickr vs Tacx Neo vs the $300 used one on Craigslist. The features that actually matter for indoor cycling and the marketing ones that don't.

Why this page exists

Cycling content online is split between pro-team marketing and beginner blogs. This site is run by a person who rides the Brandywine Valley year-round on a mid-range gravel bike.

The math here matches what real riders weigh, on real tires, on real roads. The expensive carbon wheels aren't faster for most riders; the calculators help you spend the money where it actually matters.

Plain note about money. Some links in the reviews and calculator results go to product pages on eBay with an affiliate tag. If you buy through one, the commission pays for the site. Your price doesn't change. The cheap option is usually fine; when the expensive option is worth it, this site will explain exactly why.

Honest articles

Tire pressure: the real-world chart, not the sidewall maxSidewall max is for tire safety, not your comfort. The Silca-derived chart for road, gravel, and MTB by rider weight. Bike upgrades ranked by speed-per-dollar (not bike-shop opinion)Carbon wheels are last, not first. The real priority: tires, fit, chain wax, then everything else. Lab data. Indoor trainer buying guide: the honest tiersWahoo Kickr vs Tacx Neo vs the $300 used one. The features that actually matter for indoor cycling.

Guides

Gear actually worth buying

Smart eBay searches we'd start with ourselves. We earn a small commission on qualifying sales through these links; the price you pay is the same whether you use them or go direct to eBay. Full disclosure.

🔍 Shop Cycling on eBay →
Lazer Sphere MIPS Helmet Adult Large 58-61cm White Road Bike Road helmet with MIPSMIPS-certified helmets reduce rotational force in angled impacts. Most major brands (Giro, Bell, Bontrager) now offer MIPS at all price points. Bicycle Repair Rack Bench Mount Home Bike Stand for Maintenance Bike 360°AdjustBicycle repair standA clamp-style repair stand holds the bike at working height for drivetrain and brake work. Feedback Sports and Park Tool are the reliable brands. WET Bike Chain Lube - Finish Line WET Bike Chain Lube - 8oz, Drip - LubricantChain lubricant (wet / dry)Dry lube for dry/dusty conditions, wet lube for wet roads. Apply sparingly and wipe the excess — over-lubing attracts grime. CYCPLUS Wireless GPS Bike Computer, ANT+ Bluetooth Cycling Speedometer OdometerCycling computer (GPS)Entry GPS computers from Garmin or Wahoo sync with power meters and heart-rate straps. Edge 130 or Elemnt Bolt are the practical starting points. Pair of (2) Pedro's Bicycle Tire / Tube Change Levers Tool Set - Lime GreenTire levers (quality plastic)Cheap levers crack and scratch rims. Pedro's and Park Tool levers are worth the extra dollar.
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