Just to add... Saturdays for BCI is an informal day - ie - it's basically open to newer and new riders with the club. The intensity of the rides are not as hard and there is always a coffee spot inbetween.
For more information on BCI go to bikeirvine.org. Rides are open to everyone, not just members. All the route slips are listed so you can see distance and elevation. There are basically 2 groups - medium and long and sometimes (on Sundays) a long plus and (on Saturdays) a short ride. Intensity varies within the group. For instance people doing the long rides will ride between 10 - 25 mph.
Sounds like you would easily fall within BCI's blue group.
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Private docent led mountain bike rides through Limestone Canyon. Go to
letsgooutside.org and register today! Also available: hikes, equestrian rides and family events as well as trail maintenance and science study.