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It's actually 103mm underfoot. But 3mms doesn't really make that much of a difference. Get the 100mm brake, you probably hardly have to bend them. DO NOT even think about getting the 130mm one. Brakes that are too wide can lead to problems. I switch my ARG brakes out onto my Thugs (haven't got brakes for those yet) and the extra room on either side causes them to catch each other sometimes. It is especially dangerous when skiing switch. You have to be super careful.