so riding on sunday, i was passing a tow truck and misread where my pedals would be at the closest point to him (i am going to blame it on wearing glasses when usually i wear my contacts) and my pedal came down and slammed into the curb, launching the bike and I up onto the sidewalk. didn't get hurt didn't hit him, and i have had a couple pedal strikes before when i had 175mm; so thought everything was ok. But then i started to feel a grinding/resistance for 5-7o'clock on my stroke. what did i damage? what should i check for?