Jenn, that's the way DH and I lead our rides. We do 25-40 mile rides, with some climbing. They are billed as intermediate level, with an average of 13.5-15. What usually happens is that there will be a faster cluster of riders behind DH, who is leading and a group that is about 2 mph slower, that I stay behind. DH waits at the top of bigger climbs so we regroup, or at designated points.
On one ride we lead, the "slower" contingent didn't show. I got caught at a light in the beginning and was struggling to catch up (it was an early season warm up ride and I definitely was not in the shape I am in now). They waited a bit and then DH slowed the pace... quite a few of these people struggled on the one big climb and after that, we stayed at a more moderate pace... until a rest stop when DH sort of took off. I just couldn't keep up. There was a headwind, too. But, since I was the sweep, it didn't matter. Normally, there would have been a group struggling in the back, and I seem to be able to coach people through this. In the end, I got back only a couple of minutes after the group, but I missed having the range of diversity on this ride.
Our rides are more "social," and we tell people this specifically, even if the pace is brisk. And most people say they love it and that it is a change from the usual club type rides.
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