Originally Posted by Last ride 76 (Post 21498655)

I'm glad that turned out not to be a picture of your garage...:roflmao2:

Originally Posted by ivangohome (Post 21497962)

What's the best makeshift scale for weighing a bike? Kg or lbs, doesn't matter.

I ask as I have recently acquired a good-condition Supercycle Hooligan Downhill MTB, and I suspect it's in good-condition because no one can ride it due to the weight.

Originally Posted by msu2001la (Post 21498450)

Isn't the hard part getting your bike into the bathroom?!

Originally Posted by Camilo (Post 21498277)

Really?

Originally Posted by mstateglfr (Post 21498038)

I mean simpler and easier as it pertains to fitting an accurate and repeated weight.

Originally Posted by Kapusta (Post 21498457)

Plenty of hanging scales in the weight range you are looking for online for under $20. Mine is 60 lbs max.

Bathroom scale (you+bike minus just you) will get you within about 1 lb.

Originally Posted by Last ride 76 (Post 21499103)

I forget what the warrantied accuracy of My bathroom scale was, but i measures in tenths of a pound. If I weigh myself (158.2) stepping on and off 3 times, and then pick up my bike on the last time and do that twice (177.2) both times I would say that the bike weighs pretty close to 19 lbs. not 20 or 18. Not even 19.5 or 18.5, probably between 18.8 and 19.2 lbs and very possibly even closer . While there may be an overall error of a few lbs. in my weight, (and in my weight plus the bike's weight),, the magnitude of the error in the weight of the bike should be roughly 1/8 the size of the overall error, (19/167.7)x(Gross Error)
Something like that anyway....

Originally Posted by Kapusta (Post 21499355)

You are confusing precision with accuracy. No, I wasn't. Repeating the weight test, and getting the same value, shows it measures x weight accurately to weigh x. I'm not saying anything about how much I actually weigh, just that the scale reads my weight unchanged, and the total combined weight also the same. Therefore, subtracting one from the other should be relatively accurate, in actual pounds,(As I know I'm around 160, and the bike is sub-20.) More likely to be accurate than weighing either separately.

Plenty of bathroom scales read out to the first decimal place, but do not measure with accuracy of that level.

Also, if there is an error of 1lb in your weight and an error of 1lb in the you+bike weight, then the error of the.bike weight could be anywhere from 0 to two lbs. . You are making an assumption that any inaccuracies in measurement fluctuate randomly, rather than a particular type of error (either absolute, or on a percentage basis). I took multiple readings, that did not vary thus, if there is an error in absolute terms,it is a consistent error.

I have no way of knowing whether a reading of 158.2 is accurate or 177.2 is accurate in absolute terms. However, they are likely to be closely correlated. knowing that in absolute terms, the scale is within a few pounds.

Try this sometime; weigh yourself with an empty water bottle, then do so again with varying amounts of water in the water bottle and see how accurately the scale shows fhe difference. Here you may have a point, though again, I am less concerned with individual gradations of 0.1 lbs. I will weigh myself and myself with 2 gallons of water, Results tonight if batteries are still working;)
I’m sure some scales are good enough to do this. But most typical affordable home digital scales are not. At least the few that I have used.

Originally Posted by Khaled123 (Post 21499470)

Could stand on a scale and hold your bike and then without bike and see the difference?

Originally Posted by Kapusta (Post 21498458)

I just leave it in there.

Originally Posted by Last ride 76 (Post 21499811)

Originally Posted by Kapusta View Post
You are confusing precision with accuracy. No, I wasn't. Repeating the weight test, and getting the same value, shows it measures x weight accurately to weigh x. I'm not saying anything about how much I actually weigh, just that the scale reads my weight unchanged, and the total combined weight also the same. Therefore, subtracting one from the other should be relatively accurate, in actual pounds,(As I know I'm around 160, and the bike is sub-20.) More likely to be accurate than weighing either separately.

Plenty of bathroom scales read out to the first decimal place, but do not measure with accuracy of that level.

Also, if there is an error of 1lb in your weight and an error of 1lb in the you+bike weight, then the error of the.bike weight could be anywhere from 0 to two lbs. . You are making an assumption that any inaccuracies in measurement fluctuate randomly, rather than a particular type of error (either absolute, or on a percentage basis). I took multiple readings, that did not vary thus, if there is an error in absolute terms,it is a consistent error.

I have no way of knowing whether a reading of 158.2 is accurate or 177.2 is accurate in absolute terms. However, they are likely to be closely correlated. knowing that in absolute terms, the scale is within a few pounds.

Try this sometime; weigh yourself with an empty water bottle, then do so again with varying amounts of water in the water bottle and see how accurately the scale shows fhe difference. Here you may have a point, though again, I am less concerned with individual gradations of 0.1 lbs. I will weigh myself and myself with 2 gallons of water, Results tonight if batteries are still workinghttps://www.bikeforums.net/images/smilies/wink.gif
I’m sure some scales are good enough to do this. But most typical affordable home digital scales are not. At least the few that I have used.

Originally Posted by indyfabz (Post 21499826)

Makes it easier to wash in the shower.

Originally Posted by phughes (Post 21498007)

Weight yourself, pick up pick up bike, weigh yourself and bike, do the math.

Originally Posted by phughes (Post 21498036)

Is it really difficult to stand on a scale and lift the bike? I never found it to be a problem.

Now, for getting the weight into pound and ounces, a separate scale is necessary.

Originally Posted by Bill in VA (Post 21501366)

Or use a calculator or the Google weight converter... Saved you the cost of a scale.

Originally Posted by phughes (Post 21501375)

Gee, I can figure ounces in my head, but if the scale only reads pounds, and rounds off to the nearest pound, the math is irrelevant.

Originally Posted by blacknbluebikes (Post 21498019)

...
or just crazy: say 40 lbs and if someone challenges, make them weigh it.

Originally Posted by GlennR (Post 21501535)

Is there really much difference between 30 and 31 pounds? ;)