If you live in S E Asia, where people completely disregard the road rules, sometimes it would be very handy to have a very loud horn.
Near where I live in Australia, is a track with gentle down hill sections.
You're all over the map here.
Literally.
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A race bike in any era is a highly personal choice that at its "best" balances the requirements of fit, weight, handling, durability and cost tempered by the willingness to toss it and oneself down the pavement at considerable speed. ~Bandera