My Swift started acting weird yesterday and I'm not certain why. It's got about 400 miles on it now and whenever I'm pedaling where the drive train is put under stress, generally uphill but sometimes on flats, I get a clunking sensation in the pedals that is strong enough to be audible. This is felt primarily in the right pedal when it's near bottom on the downstroke and happens consistently at the same point. You can feel it and it resonates in the frame, too, such that I can hear a clunk (I'm not sure how to exactly describe it).
I'm running with a dualdrive and am not sure if it's a problem with the casette or possibly the chain is stretching or if it's a sign of a problem with the bottom bracket? My last ride before this started happening was on a packed gravel/dirt trail for 20 miles. Somewhat rough but not terrible but everything got really dusted up. My rides also include at least one steep climb (4% up to 13%) of about a mile or so, so on commute days it gets two of these hauls.
I suspect it's not the Swift but just thought I'd see if you guys had any ideas.