XHT 3 USA Blades- 7 Lobe-Compatible with John Deere D170 G100 G110 LA150 LA175 190C with 54" Decks GY20684

What It Is

The XHT 3 USA Blades- 7 Lobe is a set of aftermarket mower blades designed for 54-inch cutting decks on select John Deere lawn tractors. They are intended for medium-to-heavy residential mowing, not commercial use.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: This blade fits only 54-inch decks. Measure your deck width (blade tip to tip) to confirm.
• Model check: Compatible with John Deere D170, G100, G110, LA150, LA175, and 190C. Not for other models or smaller decks.
• OEM crossover: Replaces John Deere part GY20684. The blade measures 21 inches long, 2.5 inches wide, with a 7-point star (7 lobe) center hole. Measure your old blade’s length, width, and center hole shape to ensure match.

If your deck is not 54 inches or your blade has a different center hole (e.g., 5-point star or oval), this will not fit.

Key Things to Know

• Quality concerns: With a 3.3-star rating from only 7 reviews, some users report premature dulling or balance issues. Inspect for warping or uneven edges upon arrival.
• Installation: Requires a torque wrench (set to 70-90 ft-lbs) and a blade removal tool. Lift the mower, block securely, and note blade orientation (cutting edge faces direction of rotation).
• Common gotcha: The 7-lobe star pattern is less common than 5-lobe. If your spindle uses a 5-lobe or keyed hole, these blades won’t work—double-check your spindle’s center hole shape.
• Sharpening: These are not “never-sharpen” blades. Plan to sharpen every 10-15 hours of mowing for best cut quality.

Should You Buy It

Only buy these if you have a confirmed 54-inch John Deere deck with a 7-lobe spindle and you’re on a tight budget. For the same price, OEM GY20684 blades from John Deere offer better durability and consistent balance. If you mow frequently or want longer life, skip these and go OEM.