Tyre stretching is putting a narrow tyre than standard on a rim.
They will fit.
Rolling radius might be put out a little bit depending on profile of the tyre.
Normally done with an adjustment in tyre profile so that wheels will fit under guards without fouling, or to maintain a certain...
Yeah I trialled e10 in my '95 K11
Dodgey fuel economy, car didn't seem to drive as well.
I run 95octane in mine and get great economy (better than on 98)
When you do get new handles buy some bumpers trim paint from repco/super cheap and paint them.
Gives them a nice black finish and protects them from sun damage
If by width you are referring to the depth that the speaker sits in the door?
I think you want to keep it to about 55mm, best bet is to pull out one of the old ones and use it as a guide and when you do install the new speaker do it with the window down just to double check.
There is a bit of...
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Part 1 https://micra.org.uk/cmf/message/50990
Part 2 https://micra.org.uk/cmf/message/70336
Found a Micra tumblr
http://micraboy.tumblr.com/
The rpf1s look great
The super s front isn't a lip it's a whole front bar.
Unless you are looking for a nismo lip.
A possible alternative is to use a lip off a getz as they fit with some persuasion