I saw one guy, but little bit he was hiking with bicycle
The trail starts with 30+% up hill grade with dozens of people work both up and down it. Once you get past that rocky and dirt trail climb then its mostly flat for a while so that part on a bike wouldn't be to bad. Overall Id say no for your safety and the people walking up as well. I don't recall seeing a no bikes sign.
Very rocky, would be challenging at the least.
It's a pretty steep climb with lots of rocks.
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