Caltric 54" Deck Blades Compatible with John Deere 190C D170 G110 E180 S180 LA150 LA175 / GY20686

What It Is

This is a set of three 54-inch deck blades from Caltric, designed to replace worn or damaged OEM blades on select John Deere lawn tractors. They are for cutting grass on residential or semi-commercial properties with a 54-inch cutting deck.

Fitment & Compatibility

Before buying, confirm your mower has a 54-inch deck and is one of these models: John Deere 190C, D170, G110, E180, S180, LA150, or LA175. The OEM reference number is GY20686. Measure your existing blades: these are 18.5 inches long, with a 1-inch center hole and a 0.281-inch (7/16-inch) diameter hole for the spindle. Check that your mower uses three blades (not two) and that the blade orientation (sail direction) matches your deck. If your mower has a different OEM number or a 48-inch deck, these won’t fit.

Key Things to Buy

• Quality vs. OEM: Caltric blades are aftermarket, typically made from heat-treated steel. They may not last as long as OEM John Deere blades in heavy use, but they are a solid budget option for residential mowing.
• Installation difficulty: Easy for anyone with basic tools. You’ll need a socket wrench and a torque wrench (tighten spindle bolts to 70-90 ft-lbs). Always lift the deck safely and disconnect the spark plug before starting.
• Common gotchas: The blades come unsharpened—you may need to sharpen them before first use for best cut quality. Also, verify all three blades are the same length and hole pattern; some aftermarket sets vary slightly.
• Balance check: After sharpening, always balance the blades to prevent vibration and spindle wear. A cheap blade balancer from any hardware store works fine.

Should You Buy It

If you have a compatible John Deere model and want to save money over OEM blades for routine grass cutting, this Caltric set is a good choice. But if you mow rough terrain, thick wet grass, or need maximum durability, stick with John Deere genuine parts. For standard residential lawns, it’s a reliable, cost-effective replacement.