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The M-Series hub has wrench flats near the stud, so that it can be tightened from the outside. Unfortunately, to keep the distance to the centerline correct, the space is too narrow to fit a standard wrench.
You could grind a wrench down, but you wont need to... One of these wrenches are included in every order of M-Series Wheels.
Specifications
Sorry, currently there are no specs but check back with us later.