Alright so here's a challenge. I plan on climbing up to the Griffith Observatory (here in LA) on a fixie. For those of you who live in LA you know how big of a challenge this is.

Setup:
Fixed/Fixed Flip Flop hub: 13T on side 23T other side.
Two chain rings: 33/42 (plan to switch them)

My plan:
I'll be riding from Highland Park to the bottom of the hill on a 33T Chain Ring and a 13T Cog in the back. This gives me 68.5 Gear Inches, which is fine.

Once at the bottom of the hill I'll flip the wheel around and add a couple of links to my SRAM PC-58 chain. (I'll be carrying a tool, shouldn't take more than a minute). At this point I'll 33T in front and 23T in the back. This will give me 38.7 Gear Inches, which I think might actualy be a little low for the climb.

Once at the top I'll turn the wheel back around and switch the Chain Rings around and adjust the chain. I'll then have 42T in front and 13T in the back, this would give me 87.2 Gear Inches. I think that's high enough to go back down the hill without letting the pedals get ahead of me.

I plan on getting the cogs and chain rings from sheldon's site or if i can get them cheaper on ebay ill try for that.

Has anyone else attempted to do something similar to this? Is there anything I might have done wrong in my planning, I don't want this to go wrong. Is anyone who's familiar with this climb know what the distance up is? I need all the help I can get. Also I'll be doing this climb with friends who are on geared bikes. Is there anything about my setup I should change? HELP!?