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Avlrider
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Bike Storage
12/11/13 at 1:59am
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What ideas do you have for storing bikes for limited floor/garage space?  My question is when hanging bikes by the wheels on hooks,..does this hurt the wheel in any way??
  
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Re: Bike Storage
Reply #1 - 12/11/13 at 2:01am
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Avlrider wrote on 12/11/13 at 1:59am:
What ideas do you have for storing bikes for limited floor/garage space?  My question is when hanging bikes by the wheels on hooks,..does this hurt the wheel in any way??


no
  
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Re: Bike Storage
Reply #2 - 12/11/13 at 2:04am
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Just watch out for valve stem. I caught one once and only once.
  
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KitJ BBQman
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Re: Bike Storage
Reply #3 - 12/11/13 at 3:28am
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Avlrider wrote on 12/11/13 at 1:59am:
What ideas do you have for storing bikes for limited floor/garage space?  My question is when hanging bikes by the wheels on hooks,..does this hurt the wheel in any way??


Just as a point of reference, 25 pound bike hung from 2 wheels is 12.5 pounds per wheel.  When I drop off of a 2 ft drop: 220 Lbs (that would be in the morning naked)  x 2 ft drop pressure on 2 wheels ~= 250 lbs per wheel (i.e. this is just a guestimate).  Which one will do more damage?  Cheesy   

damn I'm bored.
  
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JR
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Re: Bike Storage
Reply #4 - 12/11/13 at 5:18am
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KitJ BBQman wrote on 12/11/13 at 3:28am:


Just as a point of reference, 25 pound bike hung from 2 wheels is 12.5 pounds per wheel.  When I drop off of a 2 ft drop: 220 Lbs (that would be in the morning naked)  x 2 ft drop pressure on 2 wheels ~= 250 lbs per wheel (i.e. this is just a guestimate).  Which one will do more damage?  Cheesy  

damn I'm bored.


245 pounds falling from a height of 2 feet with acceleration of gravity and an impact distance of say 1/4" would yield an average impact force of ~24,800 pounds force, or ~12,400 per wheel.

This isn't taking in to account the deflection of the tire to ease the impact to the rim itself. Your psi may vary. Wink

...and yes, I'm also bored...
« Last Edit: 12/11/13 at 5:49am by JR »  
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Re: Bike Storage
Reply #5 - 12/11/13 at 12:37pm
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JR wrote on 12/11/13 at 5:18am:


245 pounds falling from a height of 2 feet with acceleration of gravity and an impact distance of say 1/4" would yield an average impact force of ~24,800 pounds force, or ~12,400 per wheel.

This isn't taking in to account the deflection of the tire to ease the impact to the rim itself. Your psi may vary. Wink

...and yes, I'm also bored...

I came up with 23,308 lbs, or 11,654 per wheel. Close enough to yours that we probably used the same equations. But 1/4" impact distance is far too small if you ask me. The majority of that mass is the rider, who bends his legs on landing, absorbing several inches. And any suspension the bike has will also compress. 

Additionally, if there's a lander or 'tranny' to the drop, you get additional effective impact deflection of d=vtTan(Θ) where v is rider speed, t is duration of impact in seconds, and Θ is the lander angle, in radians. Plugging in some numbers I felt were reasonable, I came up with 373 lbf per wheel for a 2' drop to 15° lander. Still significantly lower than any static load hanging from a wall.

I wonder when the trails will open again.
  
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Re: Bike Storage
Reply #6 - 12/11/13 at 1:10pm
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~18" impact distance? Seems legit.

I did my equation trying to figure out impact to the bike, rather than impact to the rider.

The only deflection the wheels would have would be the tires compressing.
A rider "collapsing" on a landing would experience significant less force than the wheels.
« Last Edit: 12/11/13 at 1:18pm by JR »  
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Re: Bike Storage
Reply #7 - 12/11/13 at 1:12pm
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This pully/hoist is a great system if you've got really tall ceilings in the garage, like mine.  Around $10 at harbor freight... (You need to Login or Register to view media files and links)

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DursRemote
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Re: Bike Storage
Reply #8 - 12/11/13 at 4:14pm
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JR wrote on 12/11/13 at 1:10pm:
~18" impact distance? Seems legit.

I did my equation trying to figure out impact to the bike, rather than impact to the rider.

The only deflection the wheels would have would be the tires compressing.
A rider "collapsing" on a landing would experience significant less force than the wheels.

By using a weight of 245 lbs, you were looking at impact to the bike/rider system. You used the total mass and initial height to calculate potential energy, all of which is converted to kinetic upon landing (point where height = 0). You then used the work-energy principle: total energy dissipated = F*d. The d is the amount the system CG gets displaced upon contacting the ground. When you don't allow for much deflection, you're correct in that very high impact forces can occur. This is why cush-drives are used in motorcycle sprockets, car bodies are designed to deform during crashes, and bike riders absorb landings with their legs. 

In case you still aren't convinced, imagine standing one of your bike wheels up and balancing a toyota corolla on top of it. Then add a nissan sentra, a ford focus, and a honda accord. This puts as much load on the wheel as you calculated for a 2' drop. 
  
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Re: Bike Storage
Reply #9 - 12/11/13 at 4:51pm
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DursRemote wrote on 12/11/13 at 4:14pm:

In case you still aren't convinced, imagine standing one of your bike wheels up and balancing a toyota corolla on top of it. Then add a nissan sentra, a ford focus, and a honda accord. This puts as much load on the wheel as you calculated for a 2' drop. 


I wasn't arguing your calculation at all. As stated, I didn't allow for a lot of deflection nor an angled lander.
I believe your calculation of 373 lbf to be pretty accurate.
  
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Re: Bike Storage
Reply #10 - 12/11/13 at 6:18pm
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This thread should be mandatory in a schools math class!!!!
  
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Re: Bike Storage
Reply #11 - 12/11/13 at 9:13pm
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This thread should be mandatory in a schools math class!!!!

As should mountain biking in a school's P.E. class
  
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KitJ BBQman
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Re: Bike Storage
Reply #12 - 12/12/13 at 12:13am
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The sad thing is that when I left App State to get an electronics degree from CPCC, I was about 18 hours short of having a physics degree, and I was too lazy to look up the formulas you guys used.

damn I'm bored...

OP: it is ok to hang your bike by the wheels.
  
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Re: Bike Storage
Reply #13 - 12/12/13 at 12:47am
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But your assumption that the force on each wheel is equal assumes the weight is distributed evenly (F/R weight ratio) and that both wheels make contact at the same time. Smiley
  
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Re: Bike Storage
Reply #14 - 12/12/13 at 4:03am
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Math aside make sure you screw whatever is going to hold the bike into a stud.  Nothing sucks more than coming home and finding your bike down from the wall / ceiling sitting on your (wife's) car.
  
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Re: Bike Storage
Reply #15 - 12/14/13 at 4:06pm
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I screwed 4 large plastic covered hooks in the floor joist under my house at Snowshoe to storing my DH bike for the summer. I hang it by the seat and handlebars. I don't have enough space  for a system like Johnski has. If I take both bikes, I have a place for 2 bikes. If I have others come up, we can put all 4 bikes under the house for protection.
  
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Re: Bike Storage
Reply #16 - 12/14/13 at 4:34pm
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We have a bunch of used rubber hooks for $1 each and some new ones for a little more
  
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Re: Bike Storage
Reply #17 - 12/16/13 at 9:50pm
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What I don't see here in all of this Fuzzy-Physics is an allowance for Unicorns and Jello Pudding. C'mon now, let's get serious up in here!

  
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