Check the rear rims for damage as well, and for out of round tires or bulges inspect them closely or have a friend look them over, jack each tire off the ground and spin with intent on catching a bump or lump or bulge.
I agree you should take it back to the repair shop, be friendly they missed it but ask them to recheck it as your not happy with the repair job -
I have pointed out a bad tire to a few people with a shimmy, although those types of a shimmy have happened even at low speed
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Ride a Mtn bike for errands exercise entertainment and outright fun
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