For your reference, here is the information about the geared versions of Strida. 
http://www.mingcycle.com.tw/en/products/?method=detail&aid=89
http://www.strida.hk/product_sd.html
http://www.strida.us/model-sd.asp
http://www.areaware.com/proddetail.asp?prod=cys5sds&CatID=15&subCatID=79
http://www.strida-europe.com/english/products.php?subpage=mas
[url]It seems that there'll be geared version of Strida later]
[url]Very frustrated at lack of Strida Sport Duo]
[url]Has anyone retrofitted a schlumpf on their strida?]
[url]My Strida SD (Sport Duo)]
[url]Strida SD impressions]
[url]MAS two speed reviewed]
[url]Schlumpf is a winner!]