Jacques,
A solo rider on a steep downhill will max out somewhere around 60MPH.  A 
tandem with a big team can exceed 70 but not by much.  If you've even gone 
that fast on a bike it really defines "pucker factor"  I've done 54 MPH on a 
single and 62 on a tandem.  We were still accelerating and preparing to pass 
a car when my buddy the stoker feathered the rear drum brake after deciding 
I was nuts and he wanted to live.  Wind resistance and rider weight are the 
critical factors.  I weigh over 200lbs and easily accelerate to a higher 
terminal velocity than the usual 160-175lb distance rider. Helps if your 
stoker weighs 240 also...
At those speeds you want to be an absolute fanatic about truing and 
tensioning your wheels.
Glen
> Kirk,
>
> Quite a few Caterhams (and otherSeven clones) have been fitted by their
> owners with bike speedos. See here:
> http://www.strangely.org/owned/bikecomp/
>
> If limited to two digits (like the one on my bike), the speedo should 
> reach
> 99 mph. I have only been up to 60 mph downhill - fast enough for me on a
> bike! Professional riders can reach 90 mph or more.
>
> JLC
 
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