Hello bikedreams,
welcome at Stridaforum
Sadly, the online information about the suitable rider's heights cannot be taken seriously, I'll try to explain why:
1. This information is for 16" and 18" wheels equal - that cannot be.
There must be a difference of
around one inch (2,54 cm), because the radius (equal to the distance between the axle and the rim's edge) of the 16" wheel is one inch less than that of an 18" wheel.
2. I wrote at point 1 "around", because there is also a difference in the tyre width (and therefore the tyre height).
18" tyres are usually 1,25" (Schwalbe Kojak, Panaracer Minits Lite) or 1,35" (Schwalbe Marathon, Innova) wide,
in contrast are 16" tyres 1,5" wide - that's not much, but it should be recognized.
3. The third difference can be found inside of the seat moldings,
surprisingly does the
QR seat manual mention the same range like the standard seat molding - I'm sure that's impossible, too.
We've below a standard and a quick release seat molding half, the arrows mark the topmost (green) and lowest (red) position of the seat pin...
(Please imagine the seat pin on QRS as the blue line.)


The 163 cm claim is obviously from Vanmoof:
http://vanmoof.com/shop/catalog/product_info.php?cPath=112_113_131&products_id=178http://vanmoof.com/shop/catalog/product_info.php?cPath=112_113_132&products_id=159bikedreams wrote:...and in case of purchase he needs to provide extra service at extra charges,...
Ah, excuse me, what?
Your dealer would sell you two Stridas and he wants extra charge for the adjusting of the saddle height?
That's an outstanding customer service, hmm?
Standard seat molding adjustment, short version:
1. Unmount saddle
2. Release 3 hex bolts (in case of rear carrier 4) and remove seat molding
3. Change seat pin position
4. Undo points 1. and 2.
(I bet I can do that within ten minutes, and I'm just a customer...)
I've asked my friend Mike, accidentally folding bike dealer
http://www.dasfaltrad.at/, about his opinion, he told me:
"I'd never charge a customer for such minor adjustment if I sold her(him) the bike, regardless of the date of purchase.
Of course, if (s)he bought the bike elsewhere, (s)he will be charged."
bikedreams wrote:...in order to adjust the seat-hight on my girlfriend's bike.
Bill Wilby wrote:Strida ships their bikes with this pin in the lower position and that will work for your girl friend.
That's contrary, I'd say - trust Bill

I think to know who's your dealer, as I do not want to offend somebody here, would you please answer your private mail?
Furthermore, maybe it's helpful to measure the inseam length of your better half?

Finally, 18" wheels, 1,35" tyres, QRS molding in lowest position and a ruler:


1024x768 pics are in
this album.
