Why do speedos all look shit?

I hit 86kph on the Whitehorse Challenge. That's the fastest I've gone in the UK.

The one above goes to 60mph/96kph which should cover me, at least anywhere near London :)

Fuck me ! that is around 53.5 miles per hours !!! the fastest I have ever been on a bike was just over 40 mph - and that was going down hill and was pretty hairy.