Join Date: Apr 2009
Location: Cranford, NJ
Bikes: GT Avalanche 1.0, Cannondale CAAD 9-5
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I would start with the slowest grouping here. I ride in NJ where the hills roll a bit. I'm in shape and I find that even when I feel like I'm hauling ass I average between 15.4 and 15.8 mph. The group speeds depend on terrain, traffic, etc...
That said, it is difficult to gauge your ability by reading these boards since people ride in different conditions, climates, roads, groups, etc...Just go out and do it and chalk up whatever happens up to experience