okay... no offence, but i think you guys need to look up other
bike websites and magazines for your info other than just depending
on this forum or any ONE forum for info....i only recommend stuff
when i have tested them out personally or have good reviews about
them...
shall explain to you what i have read and heard from other riders
(not in Singapore) about these tyres:-
i only said these TWO tyres Rennsport and Supercorsa as good for
600cc-1000cc and also for 400cc bikes...
(but all depends on your riding style and the way you use them and
your bike...ie, if you are a 1000cc biker who puts these tyres on..
please find some understanding of tyre characteristics, how your
bike 'tears' up tyres, etc.... and dun expect the race soft
compounds to last after your track session as long as your previous
road compound tyres...)
these work well for the 400cc bikes as these have been tested out
on Honda RVF400s.... do take a look at BiKe Magazine and check up
on their back-dated issues if you are interested to know
more...
other magazines such as Fast Bikes and Performance Bikes do such
reviews from time to time as well.....
for the 400cc bikes, the response and heating characteristics are
similar to those tested on 600cc and 750cc bikes, and they provide
the same level of grip and confidence as well.... so if you are
interested to try them out... try them out No_regret and you will
know for yourself.... 
but do bear in mind that for any tyre, even race compound tyres,
that you need to warm them up properly before expecting them to
hold the tightest line or corner... as i have heard and SEEN many
idiots out there who expect their tyres to warm up as fast as their
engines do.... so the moment the engine is at the optimal
temperature, they take the first corner out of the carpark or the
first road and then wipe-out and attribute it to the tyre being
lousy or not grippy enough... 