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#32
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Disc Brakes Are Amazing!!!
Quoting john :
Various posters: (In a nutshell; bents are slower than uprights on the flats) I'm amazed! I've always thought that recumbents were faster everywhere except up hill. Why are all absolute top speed records held by bents? One missing consideration here is that the stronger the rider, the greater the proportion of their power output goes on overcoming wind resistance over a given course. Hence a bike that decreases wind resistance but climbs more slowly may be faster for a very strong rider but slower for a normal one; this is why speed records - over real routes as well as salt flats - tend to be held by recumbents. -- David Damerell Kill the tomato! Today is Second Thursday, May. |
#33
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Disc Brakes Are Amazing!!!
On 12 May 2006 06:38:12 -0700, "john"
wrote: Various posters: (In a nutshell; bents are slower than uprights on the flats) I'm amazed! I've always thought that recumbents were faster everywhere except up hill. Why are all absolute top speed records held by bents? I've thought it was due to reduced wind resistance due to not having both leg & shoulder cross section in the wind. Plus being more fairing friendly (what's that called? FF?). [snip] Where did I get the idea they are fast? This doesn't make any sense to me, John Dear John, [quote myself from another thread] It's common to assume that recumbents have an aerodynamic advantage over the traditional diamond frame, but the advantage is actually limited to fairly extreme recumbents. You can see some of the surprising details on this speed calculator page: http://www.kreuzotter.de/english/espeed.htm Hovering the mouse over the radio button for the type of recumbent will pop up a picture that gives an idea of what a particular model looks like. After selecting a model, clicking on calculate at the bottom will give a predicted speed for the default values and the drag area used for the calculation. mph frontal type 17.1 4.3433 recumbent long wheel base 17.3 4.7889 df hands on tops 18.5 3.3781 recumbent short wheel base 19.4 3.2559 df hands on drops 20.5 2.7111 df triathlon bars 21.2 2.1748 recumbent short wheel base racer 22.3 2.0397 df superman position 23.1 1.5504 recumbent lowracer Obviously, these are idealized guides to what a particular bike and rider will do, with different tires and transmission efficiences affecting things. But for the same rider and power, it takes a recumbent that stresses speed instead of comfort to improve on the aerodynamics of an ordinary diamond frame: http://www.bicycleman.com/history/im...-record_lg.jpg Cheers, Carl Fogel |
#34
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Disc Brakes Are Amazing!!!
Edward Dolan wrote:
"Qui si parla Campagnolo" wrote in message oups.com... NYC XYZ wrote: Qui si parla Campagnolo wrote: I always read 'bent threads because I can always count on the last statement.....uprights by definition, are not 'uncomfortable' and the older you get(I'm 55), it is not automatically important that you get a 'bent....My upright is comfy, I see no need to get a bent because of my upright's comfort or my age... My Trek 1000c is the most comfortable upright I've ever had! In two months I had 700 miles on it already. But nothing is as comfortable as my SMGTe! It's like the difference between night and day. 700 miles for me is about 3 weeks on my upright. Once more, 'bents answer no question, solve no problem with regard to a well fitting upright ridden by a cyclist with no physical problems that dictate only a 'bent ride. It is largely a matter of age. If you are indeed an athlete, you may never need a recumbent bicycle. But look around you. How many of us are athletes. Almost everyone by the time they are in their 50's will benefit from a recumbent. Damn, I finally am provoked enough to answer a 'Dolan' post. I am 57 and would not consider a bent for anything. MTB and rough roads and exploring are where it's at for me, not playing sissy and old. Not even when I hit 70+ do I plan on acting over 50, not like the 'great' Ed suggests. He missed the whole point of having fun on a bike. I still take my grand kids out and since one is just turning 5 I will have ten years more to take him out, then there will be great grand kids to take riding, and I don't plan on letting them down either. Recumbents are mostly about comfort, but they are also more fun to ride than uprights once you get rid of your sport mentality. DUH? Ed seems to have an 'old' mentality. Bill Baka Regards, Ed Dolan the Great - Minnesota aka Saint Edward the Great - Order of the Perpetual Sorrows - Minnesota The Trek is now relegated to errand-running in the neighborhood, etc. For long rides where I don't have to leave my bike out of site, I am definitely riding 'bent! |
#35
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Disc Brakes Are Amazing!!!
Thanks, John
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#36
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Disc Brakes Are Amazing!!!
Ok! Ok! I see the light. I was a 'bent bigot. I guess I've never put
much thought into it. A 'bent does not = a 'bent. Kinda reminds of me of a time when I was working w/ 4 other guys & we were discussing Japanese cuisine. The 4th one popped up & said he didn't like Chinese. I looked at him somewhat surprised & pointed out that they are quite different. To which he commented, "They all have rice, don't they?" The 3 of us looked @ each other & went back to our conversation. Thanks, John |
#37
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Disc Brakes Are Amazing!!!
Actually Carl... These numbers are rather favorable to the Bents.
1. A RACE-upright ridden with hands in the drops marginably beats a Commuter-bent. How long can you ride with your hands in the drops? I am a pretty good cyclists (decent course experience) and I cannot ride a whole hour in the drops on my course-bike without getting uncomfortable. Even pro's dont ride hours upon ends in the drops. 2. A race equiped 20-20 beats a race bike 3. A race equiped lowrider begins to widen the gap. 4. A bent has a much more comfortable positoin (once you are used to it than a spartan Upright course bike. This all with 160 watt. To Pete: Compare a Trek 600 city bike against the bents you mention. Bent vs. uprights is always apples and oranges, but at least compare racing models or commuter models, dont mix and match. There are quite a few reasons to prefer an upright, but speed is one way or the other a big plus on them |
#38
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Disc Brakes Are Amazing!!!
On Thu, 11 May 2006 23:15:08 -0500, "Edward Dolan" wrote:
By the way, I am not so sure about there being no connection between bike saddles and prostate cancer and/or testicular cancer. Women also need to very wary around the conventional bike saddle. Our nether parts are really designed for seats, not saddles. Funny how I never hear about those old-time knights (lit: Horseman) fathering no *******s at all on all those commoners they slept with. Also funny how the Chinese and the Dutch haven't died out yet. Jasper |
#39
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Disc Brakes Are Amazing!!!
Edward Dolan wrote:
By the way, I am not so sure about there being no connection between bike saddles and prostate cancer and/or testicular cancer. It's about as accurate as the claim that riding a recumbent causes your brain to fall out. The evidence to support either supposition is about as strong. |
#40
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Disc Brakes Are Amazing!!!
On 12 May 2006 15:14:28 -0700, "Tuschinski"
wrote: Actually Carl... These numbers are rather favorable to the Bents. 1. A RACE-upright ridden with hands in the drops marginably beats a Commuter-bent. How long can you ride with your hands in the drops? I am a pretty good cyclists (decent course experience) and I cannot ride a whole hour in the drops on my course-bike without getting uncomfortable. Even pro's dont ride hours upon ends in the drops. [snip] Dear T., I tend to think of my upright as a touring bike, not a racer. Someone will probably remind us that one advantage of an upright touring bike is that you can ride on the drops, on the hoods, on the bars, or sitting up no-hands, while a recumbent offers pretty much only one position. But I ride on the drops pretty much all the time, barring the rare tailwind as I head up the ridge west of town on my daily ride. It's only only 45-50 minutes at my normal pace, but I occasionally do it twice a day, once with visiting friends who like the scenery, and then again lest my spreadsheet suffer from lack of data. I never found standing up and bending over on trials motorcycles uncomfortable, either, even on long trail rides, probably because that's what I grew up riding. Cheers, Carl Fogel |
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