Just picked up a new pair of mountain biking shoes with my regular Shimano SH51 cleats. When clipped in, I can move the left shoe left and right and the pedal/cleat seems to allow much more movement than it should.
My road bike and mountain bike have the same Shimano pedals. My old shoes and new shoes have the exact same cleats. In my old shoes they clip in to both road and mountain bike with a little bit of movement left and right but not much. In my new shoes, the right shoe has limited side to side movement but the left shoe, on both bikes, has so much left and right movement that my heel, with little effort, makes contact with the crank arm.
Cleat positioning seems fine. When clipped in and neutral I have about an inch to inch and a half between my shoe and the crank.
Trying to reduce the motion so when I pedal hard uphill I my shoes don't rub on the bike. I've also tightened the pedals where it's fairly difficult to clip in. I'm not sure if for some reason the left cleat is a tad smaller than my right cleat and both cleats on my old shoes.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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