are you in good hands with Allstate?
theft from your house is covered by your home owners insurance, theft from or when on your car is covered by your car insurance, if someone hits you (car) and the bike is hurt that's covered by their insurance or yours if they are uninsured and you have uninsured motorist coverage. Just don't do the bonehead move of the year (see thread by that name) because running your bike into the car port roof (roof rack) is NOT covered by any insurance and my agent never mentioned a rider.
I am seeking another insurance company because that's 2 (two) bikes he has not covered. When my Trek was lifted from my home he did not cover it because the insurance was in my then current-now ex's name and I found out the hard way they do not honor domestic partners. As far as our property was concerned we were legal strangers.
who do you use?
Yes and no, State Farm was not there
In 1994 we were the owners of the largest home robbery record in town - we may still hold the record for all I know. Among a bunch of tother stuff, they stole a custom tandem, a very high end road bike and a folding bike (all while 2 extremely expensive mtb bikes were in their way). State Farm paid for all (after the deductible) though they went into shock when they found out the replacement cost of the tandem and the road bike. They didn't believe us on the initial call and didn't come out to help. They ended up doing a recorded question period because the agent had to explain to her superiors why she wasn't on our doorstep that night when the claim/damage was so large. No, we were not in good hands but they did cough up the cash eventually.
I was also rear-ended on the freeway Jan 04. Ford Expedition going about 20 plowed into my stationary Yakima Hitchfork. They are heck for stout racks and saved me from worse damage but the rack had to be replaced as well as the back door of my Trooper. USAA paid for everything, no questions asked.
Talk to your agent and read your policy. Keeping the records on your bikes or having an LBS that knows your bike and can write up an appraisal is absolutely critical. We did not need an additional rider on any sports equipment but every policy and company is different.