View Poll Results: what's your pedal strike angle?
37-39
0
0%
40-42
0
0%
Voters: 19. You may not vote on this poll
What's your pedal strike angle?
03-15-06 | 05:04 PM
#26
Lurker for Life
Joined: Nov 2004
Posts: 908
Likes: 0
From: PDX
My setup: 59cm Soma Rush (58mm BB drop), 170mm Sugino 75 cranks, SPD-Rs
I know my pedal strike angle is over 43, because that's the angle of the banks on my track. A quick back of the envelope calculation puts me around 50deg, with the q-factor of my cranks, 700x23 radius, and pedal length.
I know my pedal strike angle is over 43, because that's the angle of the banks on my track. A quick back of the envelope calculation puts me around 50deg, with the q-factor of my cranks, 700x23 radius, and pedal length.
03-15-06 | 05:06 PM
#27
nothing: lasts forever
Joined: Aug 2004
Posts: 1,502
Likes: 2
From: minneapolis
Originally Posted by eddiebrannan
nerds 
but whatever. i'd rather ride than analyze riding. maybe i'm demented.
03-15-06 | 05:07 PM
#28
chopsockey
Joined: Feb 2005
Posts: 253
Likes: 0
From: Seattle
Bikes: Monkey SS everythingbike, Ti frankenroadbike
43 is the angle of your track, but presumably it's not flat and then all of the sudden angled, like this: _/
Nor are you riding on said shape near the bottom of the abrupt transition from 43 to 0. The angled part of the track is flat when you're on it.
Nor are you riding on said shape near the bottom of the abrupt transition from 43 to 0. The angled part of the track is flat when you're on it.
03-15-06 | 05:09 PM
#29
Cornucopia of Awesomeness
Joined: Oct 2004
Posts: 4,847
Likes: 0
From: not where i used to be
Originally Posted by yonderboy
My setup: 59cm Soma Rush (58mm BB drop), 170mm Sugino 75 cranks, SPD-Rs
I know my pedal strike angle is over 43, because that's the angle of the banks on my track. A quick back of the envelope calculation puts me around 50deg, with the q-factor of my cranks, 700x23 radius, and pedal length.
I know my pedal strike angle is over 43, because that's the angle of the banks on my track. A quick back of the envelope calculation puts me around 50deg, with the q-factor of my cranks, 700x23 radius, and pedal length.
03-15-06 | 05:12 PM
#30
Lurker for Life
Joined: Nov 2004
Posts: 908
Likes: 0
From: PDX
Originally Posted by jo5iah
Personally, you got me thinking about solving the real problem:
F(x,y) = ?
x = lean angle
y = wheel angle
Given: BB height, crank length, pedal height, q-factor, wheelbase, wheel size
I think it would make a pretty picture.
F(x,y) = ?
x = lean angle
y = wheel angle
Given: BB height, crank length, pedal height, q-factor, wheelbase, wheel size
I think it would make a pretty picture.
Radius of wheel : R
BB drop : d
Crank length : l
Q-factor : Q
Pedal length: p
Height of pedal at lowest point : d = R - d - l
End of pedal : e = (Q / 2) + p [ this is a little fudged, because it's not quite accurate ]
So with a right triangle, we're going to solve for the angle D.
That should be pretty close, unless I've forgotten my math.
03-15-06 | 05:28 PM
#31
chopsockey
Joined: Feb 2005
Posts: 253
Likes: 0
From: Seattle
Bikes: Monkey SS everythingbike, Ti frankenroadbike
i agree. i've never understood people with a mind that thinks that this sort of information translates to real life.
but whatever. i'd rather ride than analyze riding. maybe i'm demented.
but whatever. i'd rather ride than analyze riding. maybe i'm demented.
that said - i'm definitely a nerd. math is way cool.
03-15-06 | 05:41 PM
#32
Cornucopia of Awesomeness
Joined: Oct 2004
Posts: 4,847
Likes: 0
From: not where i used to be
Originally Posted by yonderboy
I used, given :
Radius of wheel : R
BB drop : d
Crank length : l
Q-factor : Q
Pedal length: p
Height of pedal at lowest point : d = R - d - l
End of pedal : e = (Q / 2) + p [ this is a little fudged, because it's not quite accurate ]
So with a right triangle, we're going to solve for the angle D.
That should be pretty close, unless I've forgotten my math.
Radius of wheel : R
BB drop : d
Crank length : l
Q-factor : Q
Pedal length: p
Height of pedal at lowest point : d = R - d - l
End of pedal : e = (Q / 2) + p [ this is a little fudged, because it's not quite accurate ]
So with a right triangle, we're going to solve for the angle D.
That should be pretty close, unless I've forgotten my math.
03-15-06 | 08:22 PM
#36
jack of one or two trades
Joined: Jun 2005
Posts: 5,640
Likes: 0
From: Suburbia, CT
Bikes: Old-ass gearie hardtail MTB, fix-converted Centurion LeMans commuter, SS hardtail monster MTB
Originally Posted by yonderboy
Sorry, I didn't realize this was a dick-waving thread. Thanks for correcting my rough approximation.
I'm too lazy to find a measuring tape, let alone measure my bikes and do math. I'm going to guesstimate a 60 degree lean for each.
