[python] Re: RWS
- From: "Greg Kolodziejzyk" <greg@xxxxxxxxxxxx>
- To: <python@xxxxxxxxxxxxx>
- Date: Wed, 27 Apr 2005 12:38:00 -0600
Jürgen wrote:
> After 160 km I also met two lycra stylish racing bikers.
> They looked down on me, sitting there with my jeans and all
> the baggage that I carried with me. Then I kindly asked them
> for the way and outran them with 38 km/h on my 20 bucks scrap python.
I absolutely LOVE stories like this! Well done Jurgen!
That reminds me of when my wife and I were touring across interior BC a
couple summers ago. I was touring on my Cannondale mountain bike with
two rear panniers, slicks for tires and aerobars. I passed two roadies
who were stunned that a mountain bike with packs passed them.
This has little to do with my ability and almost everything to do with
aerodynamics and Crr. The fact that my gear laden mountain bike weighed
probably twice what the road bikes weighed, as you know, probably
mattered very little on a flat road although the perception is that the
heavier bike would be way slower - not true on a level road.
The rear panniers probably act as a tail box providing smooth air
transition around the torso. Add to that, that fact that my frontal area
up front was smaller due to the aerobars and you have a bike that is
probably slightly more aerodynamic than a standard road bike.
Fat and slick mtn bike tires should have lower Crr than road tires
because of the rounder contact patch. Pressure differences between road
and mtn bike tires will counter this advantage, but if the pressure was
low on the road bike and high on my mtn bike, then it is possible that I
was riding with better Crr.
Greg K
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