Thank for your advice Roger.

As you probably read from my first post, or maybe not, I do not have too many bikes here for testing, so this advice was in fact a useless one.

I have tested the ones nearby, shop-owner was kind and let me try his own bikes. Next ones will available some time at spring. If it is ok with you, I will be doing my research via computer since they arrive.

Before that I will do my physical stuff on ice with skates.