Weight of a bike
Comments
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Always Tyred wrote:Stand clear. I'm a scientist.
One point I used to make to students was that the mere provision of a digital readout does not make the measurement more accurate, if the measurement is fundamentally analogue.
So the best way would be to first calibrate the scale using an object of known mass (the mass being approximately the same mass as the anticipated mass as the bike) and then weigh the bike. Although the scales may have a non-linerar response, the error this introduces will be minimal if the calibration is conducted as close as possible to the operating range of the scales which you wish to calibrate.
Mmmm. This World of Warcraft I'm playing on the other screen is thirsty work. I'm off to get some H2O (with trace concentrations of inorganic salts).
OK, there's an acurracy issue with commercial scales in general (starting point and maybe linearity) but I kinda agree with people who posted that you can get a fairly accurate weight if you subtract your weight from your + the bikes weight from common bathroom scales. Depends how accurate you wanna be, right?
On the OP have a Giant Defy 4, which should weigh in around 22lbs, however, I have lights, a bell
, mudguards not to mention pannier rack and panniers - prob closer to 26lbs+ :? 0 -
Sewinman wrote:DonDaddyD wrote:OK so I had my Kharma weighed (with pedals and new gel flow seat). The guy told me she's 20lbs exact. Is that light? Feels light. What weight are your bikes?
Out of interest, how much does your giant weigh?
The Giant has its own gravitaional pull, in normal terms, probably a little more than the Kuota.Food Chain number = 4
A true scalp is not only overtaking someone but leaving them stopped at a set of lights. As you, who have clearly beaten the lights, pummels nothing but the open air ahead. ~ 'DondaddyD'. Player of the Unspoken Game0 -
Hi,
I'd be wary of quoted weights- it'll usually be the smallest frame they make, no pedals no mudguards, no rack etc.
The measured weight of my bikes is 9Kg for the 531 fixie (with cheap 36-spoke wheels, 28c tyres, pedals & toeclips, raceblades etc). 12Kg for the old winter hack (full mudguards, bell, cheap frame otherwise much the same) and about the same (12.5?) for the tourer with rack, Brooks Pro and 18-speed gears. The new winter hack is a good bit lighter but still in double figures, I guess...
Cheers,
W.0 -
[geek] another approach would be to determine the volume of water required to balance the weight of your bike (successive measurements on any uncalibrated scale would suffice), measure its volume and calculate the mass of the bicycle from the density of water at the temperature and pressure at which you conducted the measurements. Clearly it would be best to use distilled water, at 298K, at sea level. [/geek]Rockbuddy wrote:Always Tyred wrote:Stand clear. I'm a scientist.
One point I used to make to students was that the mere provision of a digital readout does not make the measurement more accurate, if the measurement is fundamentally analogue.
So the best way would be to first calibrate the scale using an object of known mass (the mass being approximately the same mass as the anticipated mass as the bike) and then weigh the bike. Although the scales may have a non-linerar response, the error this introduces will be minimal if the calibration is conducted as close as possible to the operating range of the scales which you wish to calibrate.
Mmmm. This World of Warcraft I'm playing on the other screen is thirsty work. I'm off to get some H2O (with trace concentrations of inorganic salts).
OK, there's an acurracy issue with commercial scales in general (starting point and maybe linearity) but I kinda agree with people who posted that you can get a fairly accurate weight if you subtract your weight from your + the bikes weight from common bathroom scales. Depends how accurate you wanna be, right?
On the OP have a Giant Defy 4, which should weigh in around 22lbs, however, I have lights, a bell , mudguards not to mention pannier rack and panniers - prob closer to 26lbs+ :?0 -
Always Tyred wrote:[geek] another approach would be to determine the volume of water required to balance the weight of your bike (successive measurements on any uncalibrated scale would suffice), measure its volume and calculate the mass of the bicycle from the density of water at the temperature and pressure at which you conducted the measurements. Clearly it would be best to use distilled water, at 298K, at sea level. [/geek]
Mmm, yes geek indeed, how accurate do you want it to be? Within milligrams? But then that depends on how accurately you measure the water volume.
I guess you'd only need about 10L of dH20 and a set of, quite large, decent balancing hanging scales Something tells me you're not taking this thread too seriously
Are you a physicist? They're always banging on about Kelvin, why don't you just say 25 degrees Celcius :roll:0 -
MatHammond wrote:The Viner is 17lbs bang on. Haven't dared weigh the Ridgeback, it would probably break the scales. I reckon at least 35lbs! Other road bike is probably around 22lbs now its got my training wheels back on it.
Weighed the iron horse at the weekend, 35lbs bang on - what a guess! The Viner came in at 16.8lbs (with pedals, bottle cages, computer).0 -
Always Tyred wrote:
[geek] another approach would be to determine the volume of water required to balance the weight of your bike (successive measurements on any uncalibrated scale would suffice), measure its volume and calculate the mass of the bicycle from the density of water at the temperature and pressure at which you conducted the measurements. Clearly it would be best to use distilled water, at 298K, at sea level. [/geek]Rockbuddy wrote:Always Tyred wrote:Stand clear. I'm a scientist.
One point I used to make to students was that the mere provision of a digital readout does not make the measurement more accurate, if the measurement is fundamentally analogue.
So the best way would be to first calibrate the scale using an object of known mass (the mass being approximately the same mass as the anticipated mass as the bike) and then weigh the bike. Although the scales may have a non-linerar response, the error this introduces will be minimal if the calibration is conducted as close as possible to the operating range of the scales which you wish to calibrate.
Mmmm. This World of Warcraft I'm playing on the other screen is thirsty work. I'm off to get some H2O (with trace concentrations of inorganic salts).
OK, there's an acurracy issue with commercial scales in general (starting point and maybe linearity) but I kinda agree with people who posted that you can get a fairly accurate weight if you subtract your weight from your + the bikes weight from common bathroom scales. Depends how accurate you wanna be, right?
On the OP have a Giant Defy 4, which should weigh in around 22lbs, however, I have lights, a bell , mudguards not to mention pannier rack and panniers - prob closer to 26lbs+ :?
You are assuming that in the absence of an accurately calibrated set of scales, you do have an accurately calibrated method of measuring water volume and indeed temperature.Not climber, not sprinter, not rouleur0 -
Yes but surely everyone has those?0
