The so called Strida “5.1” is a Taiwanese domestic version which is only sold inside Taiwan.
[url]Strida 5.1]
There’re some minor differences on specifications of Strida 5 which vary from different regions/countries as well as from different batches manufactured by Ming Cycle that the distributors name the versions themselves as 5.0, 5.1, 5.2, 5.3… whatever.
http://stridasingapore.com/forum/index.php?PHPSESSID=08a0c5023865c84af6aa09c50e015dd1&topic=2934.0
This is the reason why we use Strida 5.x to refer to those different “versions” of Strida 5.
The extras on the 5.x are sold as accessories seperately which are available at or can be ordered from your local distributors/dealers of Strida.
In Hong Kong, both the 5.x and LT come with plastic freewheel while the SX and SD come with metal freewheel at the moment. However, I heard that all versions of Strida will come with metal freewheel in the near futher.
Yes, it is possible to install 18" wheels on the LT.