1.75 Inch ID x 225

The products that I ordered from Preferred Doors arrived on the date provided. I installed the products and they work perfectly. I will buy from Preferred Doors again.

Great to do business with. Excellent communications. I was expecting a cheap China knock off. Got Genuine OEM part! Fairly good instructions. One step omitted in the written instructions and the videos (NOT YOURS). There is one hole that MUST line up or you will NOT be able to install the "Chain Spreader". At this point in time, if you have installed the part, you'll have to go almost back to square 1. Make sure the hole in the plate lines up with the hole for the screw to anchor the Chain Spreader. Watch for avoiding a flip or twist in the chain. All installed and working well.

As a first time re-assembler of a garage door opener, the replacing of the gear and sprocket mechanism ended up being straightforward enough for me to enjoy the satisfaction of having done a good job. Thanks to Preferred Doors Service for providing the goods I needed to look good

My son bought a home that had a worn out garage door opener but your parts were the perfect replacement to get things working again. You tube has some great videos on how to install the gear and sproket assembly. Between that and your quality parts he should be set for years to come.

Great range easy to program.