
I only put 3 stars for noise level because I have a chain driven garage door opener and no wheel in the world can keep it very quiet! The wheels work great I used white lithium grease on the rods and put some in the track at each wheel as part of the installation. I did not change the bottom 2 wheels because I did not want to damage/distort the track, the bottom 2 are directly connected to the spring and removing the screws needs to be done with great care, or in my case not at all.

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