They come in three sizes. I bought the smallest - 20mm. Basically, you just take off the pedal and put this steel 20mm spacer onto the crank arm and then screw the pedal to that. It is very strong. I don't feel any flex or anything. I think they were invented for folks who have different physical issues - like their heels hit bike. Or folks who have to toe out more - something that would perhaps be good for me with the ITB issue. I haven't had any knee or hip pain while riding. I'll be going out again tomorrow.
It is so awesome to be able to turn without fear. It was really getting in my head. I'm going to replace my 34's with 32's. Then I bet I won't even brush the tire!!!




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