I have a few of those... there is one the defintiely looks like a downslope.. but I always have to gear down to ride it... when you first hit it, it is like riding on flat tires... weird sensation...

on the other side of that.. I live half way up a big hill (like 8% grade).. but the first half of that is less steep, but tstill an uphill.. but an uphill I can hit 22-24 mph going up... so clearly not a real uphil.. weird

jeff