I think you know that the uneven surface you initially placed the scales on to weigh the bike was responsible for the inaccurate measurement. Weighing scales are only accurate when placed on a level & flat surface, such as the floor in your house at the end on your video.
The flat and level concrete looks like it possibly has small areas that will not be supporting the 4 feet of the scales equally at 5m 31s into your video. I once found a grain of rice stuck to one of feet of my weighing scales was responsible for me appearing to have magically lost 8kg.
@@benjackson5772 totally agree, this type of scale is indoor only. uneven support of the scale throws it of completely. need to use some type of bike scale. btw when I received my new wheels, I did weighing with kitchen scale. complete wheel and tire without air and same again after pumped up, air was surprisingly around 200g at 2bar (29 psi) pressure. half pressure and you save 100g per wheel :)
@@sendit6683 To get the mass of air, we need the volume inside the tire. For that we use the volume difference between two cylinders, one representing the wheel and the other representing the tire mounted on the wheel. The volume of a cylinder is given by V = p Ã-- radius2 Ã-- height Remember that radius is diameter ¸ 2. For the wheel, the volume is given by p Ã-- (4 dm ¸ 2)2 Ã-- 1.5 dm = 19 liters (cubic decimeters). For the tire mounted on the wheel, the total volume is given by p Ã-- (5 dm ¸ 2)2 Ã-- 1.5 dm = 29 liters (cubic decimeters). The volume difference is just 10 liters, which means that the air in the tire will mass about 26 grams, less than 0.1% of the total weight (30 kg = 30,000 g) we estimated for the tire + the wheel. Because of buoyancy effects, the air will only weigh 13 grams, less than 0.05%! Physics is weird sometimes.
A helium molecule is lighter than a nitrogen molecule which air mostly consists of but a gram of helium weighs the same as a gram of nitrogen. Under non compressed conditions a gram of helium would probably take more volume (space) than the equivalent in nitrogen (maybe, nitrogen molecules are larger) but you are compressing the gas. (You don't really compress gas as such in balloons, not to the same level as a tyre but still 1.7 ish atmospheres of pressure).
why didn't you just weight the wheels before and after? Helium is lighter than air but the difference would be negligible and the helium would escape from the tube a lot quicker than air.
Alright now seeing as how we've done helium tires now how about get some like cheap forks and shock or something and do the air pressures with helium on the suspension as well
Science Rocks - outside is not a controlled environment when it comes to exacting critical measurements neither is time as your body mass changes throughout the day. By eliminating these variables the 0.1kg difference (at the end) would seem about right. In conclusion -not worth the faff.
@@wolfpack_adventures -100 grams difference; they do say that the more entertaining things are measured in grams not pounds...... plus you get squeaky voices.
When did you take your phone put your pocket? Wasn't it before the air test..... 🤔so therefore was in your pocket during the helium test 🤷♂️ that would perhaps account for the weight difference
I think you know that the uneven surface you initially placed the scales on to weigh the bike was responsible for the inaccurate measurement.
Weighing scales are only accurate when placed on a level & flat surface, such as the floor in your house at the end on your video.
The concrete path was flat and level
The flat and level concrete looks like it possibly has small areas that will not be supporting the 4 feet of the scales equally at 5m 31s into your video.
I once found a grain of rice stuck to one of feet of my weighing scales was responsible for me appearing to have magically lost 8kg.
@@benjackson5772 totally agree, this type of scale is indoor only. uneven support of the scale throws it of completely. need to use some type of bike scale. btw when I received my new wheels, I did weighing with kitchen scale. complete wheel and tire without air and same again after pumped up, air was surprisingly around 200g at 2bar (29 psi) pressure. half pressure and you save 100g per wheel :)
@@sendit6683 To get the mass of air, we need the volume inside the tire. For that we use the volume difference between two cylinders, one representing the wheel and the other representing the tire mounted on the wheel. The volume of a cylinder is given by
V = p Ã-- radius2 Ã-- height
Remember that radius is diameter ¸ 2. For the wheel, the volume is given by
p Ã-- (4 dm ¸ 2)2 Ã-- 1.5 dm = 19 liters (cubic decimeters).
For the tire mounted on the wheel, the total volume is given by
p Ã-- (5 dm ¸ 2)2 Ã-- 1.5 dm = 29 liters (cubic decimeters).
The volume difference is just 10 liters, which means that the air in the tire will mass about 26 grams, less than 0.1% of the total weight (30 kg = 30,000 g) we estimated for the tire + the wheel.
Because of buoyancy effects, the air will only weigh 13 grams, less than 0.05%!
Physics is weird sometimes.
In the aircraft Industry we use nitrogen in our tyres and suspension as it has no moisture
Nitrogen pressure is also affected less by ambient temperature changes making it ideal for tyres and shocks.
Think it was default in the Nissan Skyline GTR too
A helium molecule is lighter than a nitrogen molecule which air mostly consists of but a gram of helium weighs the same as a gram of nitrogen. Under non compressed conditions a gram of helium would probably take more volume (space) than the equivalent in nitrogen (maybe, nitrogen molecules are larger) but you are compressing the gas. (You don't really compress gas as such in balloons, not to the same level as a tyre but still 1.7 ish atmospheres of pressure).
I'm sorry but how did either of you think helium could've added over 10kg lol
That's what the scales first said
ha i love how Amanda wanted no part in this :) .... next week Alex tests the effect of random mushrooms on his riding :)
Lol… watch this space 😉
😂😂😂😂
why didn't you just weight the wheels before and after? Helium is lighter than air but the difference would be negligible and the helium would escape from the tube a lot quicker than air.
I don't know. Laziness - taking wheels off is faff.
Very interesting, I'm gonna try it and also put in the frames
It is April 1st…
Maybe just some strange winds outside
Alright now seeing as how we've done helium tires now how about get some like cheap forks and shock or something and do the air pressures with helium on the suspension as well
Good idea!
Science Rocks - outside is not a controlled environment when it comes to exacting critical measurements neither is time as your body mass changes throughout the day. By eliminating these variables the 0.1kg difference (at the end) would seem about right. In conclusion -not worth the faff.
but worth the entertainment hahah
@@wolfpack_adventures -100 grams difference; they do say that the more entertaining things are measured in grams not pounds...... plus you get squeaky voices.
When did you take your phone put your pocket? Wasn't it before the air test..... 🤔so therefore was in your pocket during the helium test 🤷♂️ that would perhaps account for the weight difference
what size bike u run ?
This is a large
Stay in school kiddos.
Lol
Try nitrogen like they do with car tyres... Doesn't go thru rubber... Bigger molecules¿
Atmosphere is 80% Nitrogen
@@Peter-nu8st so what have you done¿
Re upload? X
Yeah! I had to change something in the video :)
Well try it again