#11
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Wheel weight
John B. Slocomb wrote:
On Mon, 4 Mar 2019 22:26:16 -0500, Frank Krygowski wrote: On 3/4/2019 6:13 PM, AMuzi wrote: On 3/4/2019 4:58 PM, John B. Slocomb wrote: Yesterday I had the front wheels off two bicycles and on impulse I weighed them. One bike front wheel with 23mm tire and skewer, complete as installed on the bike weighed 2.9Kg and the second bike wheel, again complete as installed, weighed 2.8Kg. The bikes are both steel frame road bike, not racing bikes and the wheels are typical aluminum rims. Really? 2.8 kg is over 6 pounds. Can that be right? Damn this is embarrassing. After reading your post and thinking "Hey! he's right" I went out and weighed a spare wheel. This time I took two scales and compared them. The wheel with tire, skewer, etc. weighed 1.40kg with one scale and 1.41 with the other. When I weighed it the first time I wrote down 3.1kg. Since normally I can read numerals pretty well I now have to try and figure out how I went wrong :-( -- Cheers, John B. Can your scale display in either pounds or kg? It looks like you measured in lbs and reported that number as kg. |
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#12
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Wheel weight
On 3/4/2019 9:26 PM, Frank Krygowski wrote:
On 3/4/2019 6:13 PM, AMuzi wrote: On 3/4/2019 4:58 PM, John B. Slocomb wrote: Yesterday I had the front wheels off two bicycles and on impulse I weighed them. One bike front wheel with 23mm tire and skewer, complete as installed on the bike weighed 2.9Kg and the second bike wheel, again complete as installed, weighed 2.8Kg. The bikes are both steel frame road bike, not racing bikes and the wheels are typical aluminum rims. Really? 2.8 kg is over 6 pounds. Can that be right? Would this be a typical wheel weight? Heavy? Light? Sounds typical. Two road front wheels w/rubber & skewer shown on scale he http://www.yellowjersey.org/frontwheel.html SuperChampion Record w/300g tubular 2lb 7.5oz Velocity Aerohead w/Michelin Lithion 2lb 12 oz John was talking kilograms, not pounds. His 2.8 kg sounds awfully heavy. I just weighed my front wheel twice, using two different scales. The small spring scale said 1500 grams. The digital scale said 1540 grams. That's about 3.3 pounds. That's a Sun CR-18 rim, Pasela 28mm tire, 36 spokes, SunTour hub and skewer. It's a touring wheel. Oh gosh you're right 2800g is a pair of heavy wheels. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#13
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Wheel weight
On Monday, March 4, 2019 at 10:57:24 PM UTC-8, James wrote:
On 5/3/19 2:26 pm, Frank Krygowski wrote: On 3/4/2019 6:13 PM, AMuzi wrote: On 3/4/2019 4:58 PM, John B. Slocomb wrote: Yesterday I had the front wheels off two bicycles and on impulse I weighed them. One bike front wheel with 23mm tire and skewer, complete as installed on the bike weighed 2.9Kg and the second bike wheel, again complete as installed, weighed 2.8Kg. The bikes are both steel frame road bike, not racing bikes and the wheels are typical aluminum rims. Really? 2.8 kg is over 6 pounds. Can that be right? Would this be a typical wheel weight? Heavy? Light? Sounds typical. Two road front wheels w/rubber & skewer shown on scale he http://www.yellowjersey.org/frontwheel.html SuperChampion Record w/300g tubular 2lb 7.5oz Velocity Aerohead w/Michelin Lithion 2lb 12 oz John was talking kilograms, not pounds. His 2.8 kg sounds awfully heavy. I just weighed my front wheel twice, using two different scales. The small spring scale said 1500 grams. The digital scale said 1540 grams. That's about 3.3 pounds. That's a Sun CR-18 rim, Pasela 28mm tire, 36 spokes, SunTour hub and skewer. It's a touring wheel. Agree. I think a front wheel for racing would weigh about 1 kg. At least I think mine is close to that. John, Here is a listing of front and rear wheel weights, typically without a tyre mounted. Add maybe 200g for a that, for a relatively light weight tyre. https://weightweenies.starbike.com/listings/components.php?type=roadwheels -- JS The carbon clinchers: Front; 1.13 Kg Rear with 11-29 cassette; 1.58 Kg. |
#14
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Wheel weight
On Tuesday, March 5, 2019 at 7:45:36 AM UTC-8, wrote:
On Monday, March 4, 2019 at 10:57:24 PM UTC-8, James wrote: On 5/3/19 2:26 pm, Frank Krygowski wrote: On 3/4/2019 6:13 PM, AMuzi wrote: On 3/4/2019 4:58 PM, John B. Slocomb wrote: Yesterday I had the front wheels off two bicycles and on impulse I weighed them. One bike front wheel with 23mm tire and skewer, complete as installed on the bike weighed 2.9Kg and the second bike wheel, again complete as installed, weighed 2.8Kg. The bikes are both steel frame road bike, not racing bikes and the wheels are typical aluminum rims. Really? 2.8 kg is over 6 pounds. Can that be right? Would this be a typical wheel weight? Heavy? Light? Sounds typical. Two road front wheels w/rubber & skewer shown on scale he http://www.yellowjersey.org/frontwheel.html SuperChampion Record w/300g tubular 2lb 7.5oz Velocity Aerohead w/Michelin Lithion 2lb 12 oz John was talking kilograms, not pounds. His 2.8 kg sounds awfully heavy. I just weighed my front wheel twice, using two different scales. The small spring scale said 1500 grams. The digital scale said 1540 grams. That's about 3.3 pounds. That's a Sun CR-18 rim, Pasela 28mm tire, 36 spokes, SunTour hub and skewer. It's a touring wheel. Agree. I think a front wheel for racing would weigh about 1 kg. At least I think mine is close to that. John, Here is a listing of front and rear wheel weights, typically without a tyre mounted. Add maybe 200g for a that, for a relatively light weight tyre. https://weightweenies.starbike.com/listings/components.php?type=roadwheels -- JS The carbon clinchers: Front; 1.13 Kg Rear with 11-29 cassette; 1.58 Kg. That is with tires and tubes. And the speedo magnet. |
#15
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Wheel weight
On 3/5/2019 3:44 AM, John B. Slocomb wrote:
On Mon, 4 Mar 2019 22:26:16 -0500, Frank Krygowski wrote: On 3/4/2019 6:13 PM, AMuzi wrote: On 3/4/2019 4:58 PM, John B. Slocomb wrote: Yesterday I had the front wheels off two bicycles and on impulse I weighed them. One bike front wheel with 23mm tire and skewer, complete as installed on the bike weighed 2.9Kg and the second bike wheel, again complete as installed, weighed 2.8Kg. The bikes are both steel frame road bike, not racing bikes and the wheels are typical aluminum rims. Really? 2.8 kg is over 6 pounds. Can that be right? Damn this is embarrassing. After reading your post and thinking "Hey! he's right" I went out and weighed a spare wheel. This time I took two scales and compared them. The wheel with tire, skewer, etc. weighed 1.40kg with one scale and 1.41 with the other. When I weighed it the first time I wrote down 3.1kg. Since normally I can read numerals pretty well I now have to try and figure out how I went wrong :-( Hey, we've all had to slap our foreheads at one time or another. ;-) -- - Frank Krygowski |
#16
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Wheel weight
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#17
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Wheel weight
On Tue, 5 Mar 2019 13:37:12 +0000 (UTC), Ralph Barone
wrote: John B. Slocomb wrote: On Mon, 4 Mar 2019 22:26:16 -0500, Frank Krygowski wrote: On 3/4/2019 6:13 PM, AMuzi wrote: On 3/4/2019 4:58 PM, John B. Slocomb wrote: Yesterday I had the front wheels off two bicycles and on impulse I weighed them. One bike front wheel with 23mm tire and skewer, complete as installed on the bike weighed 2.9Kg and the second bike wheel, again complete as installed, weighed 2.8Kg. The bikes are both steel frame road bike, not racing bikes and the wheels are typical aluminum rims. Really? 2.8 kg is over 6 pounds. Can that be right? Damn this is embarrassing. After reading your post and thinking "Hey! he's right" I went out and weighed a spare wheel. This time I took two scales and compared them. The wheel with tire, skewer, etc. weighed 1.40kg with one scale and 1.41 with the other. When I weighed it the first time I wrote down 3.1kg. Since normally I can read numerals pretty well I now have to try and figure out how I went wrong :-( -- Cheers, John B. Can your scale display in either pounds or kg? It looks like you measured in lbs and reported that number as kg. That was my original thought - I wrote the numbers backward so 1.3 became 3.1, but that turned out to be wrong as when I weighed the second time the actual weight turned out to be 1.4. It is still a mystery to me so for the moment I am assigning the blame to old age :-) -- Cheers, John B. |
#18
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Wheel weight
On Wed, 6 Mar 2019 09:41:29 +1100, James
wrote: On 6/3/19 2:48 am, wrote: On Tuesday, March 5, 2019 at 7:45:36 AM UTC-8, wrote: The carbon clinchers: Front; 1.13 Kg Rear with 11-29 cassette; 1.58 Kg. That is with tires and tubes. And the speedo magnet. If you changed to a Garmin or other GPS based speedometer, you could save valuable grams from the front wheel because there's no need for a magnet. I've always been a little skeptical about GPS calculated measurements. I remember back when we lived on the boat the GPS would sometimes measure the altitude at 10 feet which was about twice the height above sea level that the receiving antenna was mounted at. -- Cheers, John B. |
#19
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GPS (was: Wheel weight)
John B. Slocomb wrote:
I remember back when we lived on the boat the GPS would sometimes measure the altitude at 10 feet which was about twice the height above That's why even most GPS based cycle computers use barometric pressure for altitude -- GPS is pretty bad for that. -- Note: please read the netiquette before posting. I will almost never reply to top-postings which include a full copy of the previous article(s) at the end because it's annoying, shows that the poster is too lazy to trim his article, and it's wasting the time of all readers. |
#20
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Wheel weight
On 3/5/2019 3:20 PM, John B. Slocomb wrote:
On Wed, 6 Mar 2019 09:41:29 +1100, James wrote: On 6/3/19 2:48 am, wrote: On Tuesday, March 5, 2019 at 7:45:36 AM UTC-8, wrote: The carbon clinchers: Front; 1.13 Kg Rear with 11-29 cassette; 1.58 Kg. That is with tires and tubes. And the speedo magnet. If you changed to a Garmin or other GPS based speedometer, you could save valuable grams from the front wheel because there's no need for a magnet. I've always been a little skeptical about GPS calculated measurements. I remember back when we lived on the boat the GPS would sometimes measure the altitude at 10 feet which was about twice the height above sea level that the receiving antenna was mounted at. As you should be; GPS has a notoriously large margin of error for measuring altitude. I think it's the trigonometry of the computation; the GPS (as I understand it) measures distance to a collection of satellites whose positions are well known, then computes location from triangulating the results. I'm guessing that since most of the satellites are usually not directly overhead, but rather the line of sight to the satellite is usually be much closer to tangential to the earth, then very small errors in the distance-to-satellite computation turn into much larger errors in the altitude computation. I think this is why higher-end bike GPS's have a pressure-based altimeter as well, to correct the fluctuations in the GPS-computed altitude. I know my Garmin Edge's regularly solicit known altitude input at the start of a course. Mark J. |
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