That depends on which route you're planning on doing and what routes are this year.
I think you'd be fine with the 1/2 metric. From Upland(last year, you went out Foothill/66 to Claremont and then up to baseline and East before looping back.
The Metric did a loop through Bonelli Park and one good climb in La Verne before going east on Basline into Fontana(don't worry, This portion is definetly not "Fontucky") My understanding is someone sabatoged the route markers for the metric last year. I was doing Sag on my Bike for the 30 last year.
I have no idea what the routes for this year are. in 2005 the metric did a part of Mt. baldy road and then up to Lytle Creek Rd. The only problem was that we had Santa Ana winds that day, so most people turned around when they got to the 15. I'll let TE know more when I find out...
Look foward to seeing you on the 14th