No, there are not fewer or different crossings, just different hubs. Both front and rear will be 3x. Dynamo hubs are very large flange. I'll take the advice and buy two different lengths, or maybe 3. Only the front is going to be built at this point anyway. That will be a completely new wheel. The rear has a dent in the rim, but is still rideable. I wasn't actually going to replace it except that I found someone selling pairs on eBay for only a little more than I was finding single rims at the online retailers.