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With a 50 mm stack height (pic 2), does it mean you cannot race in the new Adidas Adizero Prime X, since only -40mm is legal in road running? : r/RunningShoeGeeks
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Adidas Boston 9 Review at 100 Miles | Best lower stack height non carbon plate running shoes? eddbud - YouTube
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Adidas Boston 9 Review | Best distance race shoe? | Best value running shoe? | eddbud Initial Review - YouTube
![Amazon.com | adidas Men's Adizero Boston 9 Running Shoe - Color: Blue/Yellow/White - Size: 8.5 - Width: Regular | Road Running Amazon.com | adidas Men's Adizero Boston 9 Running Shoe - Color: Blue/Yellow/White - Size: 8.5 - Width: Regular | Road Running](https://m.media-amazon.com/images/I/71UeLChMWJS._AC_UY580_.jpg)
Amazon.com | adidas Men's Adizero Boston 9 Running Shoe - Color: Blue/Yellow/White - Size: 8.5 - Width: Regular | Road Running
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