Tyre pressures OK?

Tyre profile lost on the shoulder to more of a V will give this sensation.

Head races checked you say, but perhaps an idea to get them greased up just incase you've a tight spot.

The 21" front does make it slower to turn, but a bit of counter steering soon sorts that out.

If your chain was really tight that may feel strange (tight spot again), but you'd probably have noticed before the roundabout.

My two penny worth..

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