Hi Harold, when I started to train for my IM, I trained for the first 4 month using a old battered
bike, about 12 years old, standing for the last 10 years in the cellar collecting dust. It was a old
race bike, weighted about 12 kg, steel frame, 10 gears, no aero-bar, no clip-in-pedals so I trained
wearing running shoes.
After I was sure that I would really do the IM, I decided to by a state-of-the-art-bike, costing
about US$ 2.500 and weighting about 8 kg.
I, too, was curious about the improvement in speed. So before I switched to the new bike I recorded
my average speed and average puls rate on a absolutely flat road in no-wind conditions. I could do
that on about 3 different training days, going for 2-3 hours each day.
After I got the new bike (aero-bars with grip-shift, dura-ace, clip-in cycling shoes, some carbon
parts on the bike, well the usual stuff), I tried to find out how much faster the bike is at the
same heart rate, going the same, flat roads.
My measurement is not exactly scientific, of course, but I feel it is save to say that the new bike
was between 1,5 km/h and 3 km/h faster doing the same 2-3 hour rides on flat streets as before. So
for example with the same heart rate of about 135 I could go 29 km/h instead of 27 km/h.
So if we assume that the new bike is 2 km/h faster, and it took me 6.5 hours for the 180km doing the
IM, the new bike saved me about 25 minutes.
That's a hundred dollars per minute ! Too much if you ask me.
However, I really like to ride the new bike and it keeps me motivated to continue to train.
Consequently my body fat will drop, my resting heart rate will sink, my blood pressure will be
lower. And all that for US$2.500 - quite cheap if you ask me.
But anyway, I hope that one day I am fit enough to do an IM using a very old, very rusty "grand
ma's" bike - just for the heck of it !
Manfred
"Harold Buck" <[email hidden]> schrieb im Newsbeitrag
"]news:[email hidden]...
Quoted message said:I've read some interesting stuff lately about bike weight.
One is that, for every FIVE POUNDS you shave off your bike (or yourself), you'll save about 30
seconds off of a 5K uphill time trial (averaging 7% grade, I think). That's really not a ton of
time for someone in the middle or back of the pack in an Ironman-distance race: if there was a
full 31 miles of 7% grade climbing, cutting that 5 pounds off your bike only saves you about 6
minutes, and it probably costs you a few thousand bucks to cut it. (This article was in Bicycling,
I believe).
The second article (in American Tri) talked about how the bike and component manufacturers love to
focus on weight since it's objective: people can say things like, "Well, I'm paying an extra $90
for this saddle because it weighs 40 g less than this other one." In actuality, aerodynamics are
probably much more significant in most cases, but since they're harder to quantify they're harder
to sell. In addition, they often use tricks to make it seem like you're saving more overall weight
than you really are, and there's the loss in durability you get when you cut weight.
All in all, the two articles made me feel a whole lot more content with my decent--but not super
light--road bike.
(Of course, if you can cut weight off of YOU without compromising strength, you should for it!)
--Harold Buck
"I used to rock and roll all night, and party every day. Then it was every other day. . . ."
- Homer J. Simpson