John Deere Original Equipment Mower Blade Kit GY20850 - OEM Fit

In this review of the John Deere Original Equipment Mower Blade Kit GY20850, the bottom line is simple: this kit is for owners of compatible John Deere lawn tractors and mowers who want genuine OEM blades that arrive sharp and fit as intended. The reviewer found the blades to be sturdy, correctly finished, and easy to install, making them a straightforward replacement for routine blade maintenance. For anyone with a listed model, the single biggest reason to buy is the assurance of an OEM part that restores cutting performance with minimal fuss.

Key Features

• OEM part number: GY20850 ensures an exact match to John Deere factory specifications for affected models, so replacement is straightforward.
• Wide fitment: Fits a long list of tractors and mowers including 102, 105, 115, 125, 135 and LA100 through LA135 42in decks, so one kit covers many common models.
• Factory sharpness: Blades arrive with a usable edge so users spend less time re-sharpening and can return to cutting quickly.
• Durable construction: Built to OEM tolerances, the blades feel sturdy and resist deformation during normal lawn use.
• Easy installation: Customers report the blades install cleanly on compatible spindles and fit without modification.

Who It's For

This blade kit is aimed at homeowners and small property owners who already own compatible John Deere mowers or tractors and want a direct OEM replacement to maintain cutting performance. It is particularly useful for those who prefer original equipment parts that match factory fit, finish, and blade geometry.

It is not intended for users looking for aftermarket specialty blades with mulching slots or aggressive tear patterns; those who need nonstandard cutting profiles or custom modifications should look elsewhere. Also confirm your model number against the fitment list before purchase to ensure compatibility.

Pros & Cons

Pros

• Genuine OEM fit gives confidence in compatibility and blade geometry for a clean cut.
• Blades arrive sharp, reducing initial prep time and restoring mowing quality quickly.
• Durable construction and correct finish make installation straightforward on listed models.
• Good value for replacing worn or damaged blades with factory parts.

Cons

• Limited to the factory blade design, so not suitable for those seeking specialty aftermarket cutting performance.
• Compatibility is restricted to specific John Deere models, so verification is required before ordering.

Specifications

Brand	John Deere
Part number	GY20850
Fitment - series	102, 105, 115, 125, 135
Fitment - LA series	LA100(42in), LA105(42in), LA110(42in), LA115(42in), LA120(42in), LA125(42in), LA135(42in)
Fitment - D/X series	D100, D105, D110, D120, D125, D130, X125, X145
Included parts	John Deere original mower blade kit

Our Verdict

The John Deere GY20850 mower blade kit is a solid choice for owners of the listed John Deere models who want a genuine OEM replacement that fits correctly and delivers a sharp cutting edge out of the box. For routine blade replacement it represents strong value and reduces downtime, though buyers seeking specialized cutting profiles should consider aftermarket alternatives.

Frequently Asked Questions

Will these blades fit a 42in LA deck?
Yes; the kit lists compatibility with LA100 through LA135 42in models, but buyers should verify their exact deck model before ordering.

Do the blades come sharpened?
Customers report the blades arrive with a usable, sharp edge so immediate installation is possible.

Are these genuine John Deere parts?
Yes, the product is sold as an OEM John Deere part with part number GY20850, intended as a factory-equivalent replacement.