7638 17.5in Cast Iron Grates Replacement for Weber Spirit & Genesis

In this review of the 7638 17.5in cast iron replacement grates, the bottom line is simple: these grates are aimed at owners who need an affordable, heavy-duty replacement that matches the fit and function of many Weber Spirit and Genesis models. The reviewer found the set especially useful for Spirit 300 Series grills and older Genesis and Silver/Gold/Platinum variants because the grates reproduce the original contact surface and heat retention. Installation is straightforward and the cast iron material gives a solid sear, making this a practical replacement option.

Key Features

• Model Compatibility: Fits a long list of Weber Spirit and Genesis models, which makes it a convenient replacement for many older grills.
• Cast Iron Construction: Matte cast iron provides good heat retention and creates pronounced sear marks for better grill flavor.
• Exact Size: Each piece measures 17.5 x 11.9in so the two-piece set covers 17.5 x 23.8in total, matching the original cooking area dimensions.
• Easy to Maintain: Can be soaked and cleaned with soap and a soft brush, then dried and seasoned for corrosion protection.
• Direct Part Replacements: Compatible with common OEM part numbers and many Weber model numbers, simplifying the search for the correct replacement.

Who It's For

This product is best for homeowners who own compatible Weber Spirit 300 Series, Spirit 700, Weber 900, or a range of Genesis models and need a like-for-like replacement for worn or damaged grates. Grillers who value strong heat retention and bold sear marks will appreciate the cast iron surface for regular direct grilling.

These grates are less suited for users who prefer lightweight or porcelain-coated grates that require less frequent seasoning or who own newer GS4 or Genesis II LX variants unless model compatibility is confirmed first. Inspect your grill model number to ensure a match before purchasing.

Pros & Cons

Pros

• Good fit for many Spirit and Genesis models, reducing compatibility guesswork.
• Cast iron material improves searing and heat retention compared with thinner metal grates.
• Easy to install and replace, with customers reporting quick swaps in minutes.
• Affordable value compared with buying OEM branded parts.

Cons

• Durability feedback is mixed, so long term resistance to rust depends on regular seasoning and care.
• Requires proper drying and seasoning to prevent corrosion, which is additional maintenance compared with coated grates.

Specifications

Material	Matte cast iron
Piece Size	17.5 x 11.9 in (each)
Set Coverage	17.5 x 23.8 in (two pieces)
Compatible Models	Spirit 300 Series, Spirit 700, Weber 900, Genesis 1000-3500, Silver/Gold/Platinum B/C
Also Fits	GS4 Spirit II E-310/S-310 variants and some Smokefire models
Care	Soak, clean with soft brush, dry completely and season before use

Our Verdict

These 17.5in cast iron replacement grates are a practical, cost-effective choice for owners of compatible Spirit and Genesis grills who want improved searing and heat retention. They offer a reliable fit and good cooking performance when maintained properly, making them a solid value for anyone replacing worn OEM grates.

Frequently Asked Questions

Will these grates fit my Spirit 300 Series grill?
They are designed to fit Spirit 300 Series models including E310, E320, E330 and S310/S320/S330, but confirm your model before ordering.

How should I clean and prevent rust?
Soak in warm soapy water, scrub with a soft brush, dry completely and season the grates before storage and before each use.

Are these the same as OEM Weber parts?
They are compatible replacements that match many OEM part numbers and model fits, offering similar function and dimensions.