i'm pretty sure surly only makes fixed and/or free hubs, but if they don't that's what i'm referring to. my question is that do the various sizes (120, 130, 135) all have the same flange width and hub body or are they different for each size? for instance, with a change of axle and spacers, could you effectively change the hub from one size to another? i've dealt with both the 120 and 135, but never had them together to compare. thanks!