Small Brown Mouse 

If you are coming onto this route ("Small Brown Mouse") for the first time, it is at least a 5.9c. Luckily the bolts are placed well so that the spots where a climber is likely to have trouble will give you safe drops through the air. A fun, and exciting climb for intermeadiate leaders. Two Stars! I agree with Thorkel that this is the hardest route on this rock from an overall perspective. Tony Lusk's excellent "Firezone" has a more technical starting move, but dropping 4 feet off the mantle shelf does not produce the "freak-out" factor of falling from the muscle crux of SBM!

Desicon

For anyone under 5'8" I would say this is more like 10a.

I'm 6' and still haven't ticked SBM off. It's a very sustained climb, on the pumpy side and I'd argue for the 5.10a/b range.