Gear Heads · SKU B0GC5J6RVS
308210009 Trimmer Gear Head and String Trimmer Head Replacement
$49 Amazon rating ★ 4.5
308210009 Trimmer Gear Head and String Trimmer Head Replacement for RYOBI RY40250 RY40205BTL RY40270VNM RY253SS RY4CSS RY253SSVNM RY41135 Trimmer, with Adapt…
Compatibility
The seller's listing names these models as compatible. Always confirm the model number stamped on your machine before ordering.
Not sure which part you need? See our guide: How to measure your bar or How to read the stamp on your guide bar.
Before you buy — how to verify fitment
- Measure shaft diameter. Common sizes are 24mm, 25.4mm, and 28mm — check your trimmer manual or measure the drive shaft.
- Count the splines. The gear head input must match your shaft spline count (typically 7 or 9).
- Check output thread. Verify the thread direction and size for your cutting attachment.
- Confirm your trimmer model against the compatibility list above.
Frequently asked questions
How do I know which gear head fits my trimmer?
Match the shaft diameter (typically 24mm, 25.4mm, or 28mm), the number of splines (7 or 9), and the thread direction on the output shaft. Check your trimmer manual for these specs.
Can I replace a gear head myself?
Yes. Remove the old head by loosening the clamp bolt, slide it off the shaft, and slide the new one on. Align the drive shaft splines, tighten the clamp, and check for wobble before running.
Where to buy
This part is sold and shipped through Amazon. Check the live listing for current price, stock, delivery and return options.
Affiliate disclosure: we may earn a commission when you purchase through this link, at no extra cost to you.
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