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#12
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28 vs 32 tire
On Sat, 27 Aug 2005 03:45:47 GMT, "Sniper Anon"
wrote: On 23-Aug-2005, wrote: Hmmm . . . The highest point in Illinois is Charles Mound at 1135 feet. The highest point in Missouri is Taum Sauk Mountain at 1772 feet. Summit County, Colorado, enjoys an altitude of about 9,000 feet around popular Dillon Reservoir: http://www.topozone.com/map.asp?lat=39.6&lon=-106.01667 So let's start with the defaults for a "roadster" with "robust" tires at 1150 feet on this handy calculator and vary the tires and elevation: 750 feet MSL would be much closer to the average elevation of the Illinois Prairie Path. Dear Snip, I expect that you're right and that 750 feet is more accurate for Illinois. But now let's plug your figure into the calculator and insert the result in the original table: http://www.kreuzotter.de/english/espeed.htm bike elev. tires mph ---- ---- ----- --- roadster 750 robust 14.7 snip's adjusted elevation roadster 1150 robust 14.8 Illinois roadster 9000 robust 16.2 Colorado roadster 750 medium 15.6 snip's adjusted elevation roadster 1150 medium 15.7 Illinois roadster 9000 medium 17.2 Colorado This illustrates how a 400-foot change in elevation (1150 versus 750 feet) barely shows up in a modest bicyling example--the speed change registers as only a tenth of a mile per hour, and that's probably due to lucky rounding. It takes a rise of 7,850 feet to reduce wind drag enough to add about 1.5 mph to a bicycle going about 15 mph. The wind-drag reduction of a rise only roughly 1/20th of that height is too small to measure reliably on a scale using tenths of a mile per hour. And of course the 9,000 foot figure for Summit County is the elevation of the reservoir--most trails go up from the http://www.topozone.com/map.asp?lat=39.6&lon=-106.01667 Note the nameless 9430-foot hill next to the reservoir. The nearby mountains (5 miles away) run 10 to 12 thousand feet So I think that the default Kreuzotter 1150-foot elevation works well enough to show the wind-drag in both Illinois and Missouri versus what may be expected in Summit County, Colorado. From Colorado, the elevations of Illinois and Missouri resemble a who's-the-tallest-dwarf contest, just as Colorado elevations amuse a doctor whom I know who grew up in the shadows of the Himalayas. Cheers, Carl Fogel |
#13
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28 vs 32 tire
On Fri, 26 Aug 2005 22:43:08 -0600, wrote:
From Colorado, the elevations of Illinois and Missouri resemble a who's-the-tallest-dwarf contest, just as Colorado elevations amuse a doctor whom I know who grew up in the shadows of the Himalayas. In the time it's taken for this thread to reach this point, a thread started by my reference to our recent cycling outing in Summit County, Colorado; we've traveled to New Hampshire and back. As an aside, we did take our bikes with us and got in some riding in the Conway, Tamworth, Sandwich areas. However, to further illustrate Carl's point, our host on this latest journey had a certificate on his wall attesting to his having successfully scaled all the 4,000 footers in the White Mountains. Sigh! jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3 |
#14
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28 vs 32 tire
On Fri, 26 Aug 2005 22:43:08 -0600, wrote:
And of course the 9,000 foot figure for Summit County is the elevation of the reservoir--most trails go up from the http://www.topozone.com/map.asp?lat=39.6&lon=-106.01667 Note the nameless 9430-foot hill next to the reservoir. Not nameless at all. I assume you're referring to Sapphire Point, reached by bike up Swan Mountain Road. Perhaps not, since that's listed as 9606' on my topo map. Later...okay, I did check the above url. The point you're referring to is indeed unnamed, even on my topo map; but note the road paralleling the lake just to the north of the 9430' hill. That's Swan Mountain Road, and at that particular spot dead straight and really downhill. I've approached 50 mph coming down there, but last time suddenly remembered I was on a 15 year old bike and decided some application of brakes would be prudent. jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3 |
#15
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28 vs 32 tire
On Wed, 31 Aug 2005 21:19:14 GMT, John Everett
wrote: On Fri, 26 Aug 2005 22:43:08 -0600, wrote: From Colorado, the elevations of Illinois and Missouri resemble a who's-the-tallest-dwarf contest, just as Colorado elevations amuse a doctor whom I know who grew up in the shadows of the Himalayas. In the time it's taken for this thread to reach this point, a thread started by my reference to our recent cycling outing in Summit County, Colorado; we've traveled to New Hampshire and back. As an aside, we did take our bikes with us and got in some riding in the Conway, Tamworth, Sandwich areas. However, to further illustrate Carl's point, our host on this latest journey had a certificate on his wall attesting to his having successfully scaled all the 4,000 footers in the White Mountains. Sigh! jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3 Dear John, To be fair, it sounds like an awful lot of hiking: http://www.peakbagger.com/list.aspx?lid=21404 And 6,000+ feet of clean prominence isn't bad at all: http://www.peakbagger.com/peak.aspx?pid=6960 The description makes Mount Washington sound cold, miserable, and dangerous. Brrr! Just thinking about it makes me want to go riding half an hour early this evening, just to be safe and warm--with the current cold snap, the temperature might drop below 70 before sunset. Carl Fogl |
#16
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28 vs 32 tire
On Wed, 31 Aug 2005 16:23:31 -0600, wrote:
On Wed, 31 Aug 2005 21:19:14 GMT, John Everett wrote: However, to further illustrate Carl's point, our host on this latest journey had a certificate on his wall attesting to his having successfully scaled all the 4,000 footers in the White Mountains. Sigh! jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3 Dear John, To be fair, it sounds like an awful lot of hiking: http://www.peakbagger.com/list.aspx?lid=21404 And 6,000+ feet of clean prominence isn't bad at all: http://www.peakbagger.com/peak.aspx?pid=6960 The description makes Mount Washington sound cold, miserable, and dangerous. Brrr! Just thinking about it makes me want to go riding half an hour early this evening, just to be safe and warm--with the current cold snap, the temperature might drop below 70 before sunset. Dear Carl: As an aside, there's an annual bike race up the Mt. Washington auto road. It was held just before we arrived in NH, and was all the news in the local sports pages. Winner...tah-dah...Tyler Hamilton. Guess the local organizers don't pay no mind to those furrin UCI suspensions. ;-) jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3 |
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