Stirling is also closed now. I grew up in Long Hill and lurk on the Long Hill FB page. The story is that the owner sold the business, and a Trek Store will be opening in it's place soon. Not sure if that applies to just the Stirling store or also to the Millburn store.
Oddly, though, when I walked by recently, the building still looked to be filled with bikes. After seeing this thread, I was hoping they weren't repairs waiting for pickup by owners who would no longer be able to retrieve them.
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Did High Gear Cyclery close/move? The store looks empty when I rode by. Phone calls go over to voicemail. I don't see any information on their website either.