Softail Models Standard, Custom, Night Train, Deuce, Springer, Heritage, Fatboy, Deluxe, Rocker and Cross Bones.
Sponsored by:
Sponsored by:

How much force is created with swingarm movement?

Thread Tools
 
Search this Thread
 
Old Mar 2, 2010 | 09:31 PM
  #1  
JustDave71's Avatar
JustDave71
Thread Starter
|
Outstanding HDF Member
Joined: Jul 2008
Posts: 2,115
Likes: 5
From: SoCal
Default How much force is created with swingarm movement?

Anyone have any ideas approximately how much force is generated on average?

Sorry...don't know the tech term, but basically, how much resistance would be needed at the top swingarm bar to moderate swingarm movement?
 
Reply
Old Mar 3, 2010 | 09:20 PM
  #2  
JustDave71's Avatar
JustDave71
Thread Starter
|
Outstanding HDF Member
Joined: Jul 2008
Posts: 2,115
Likes: 5
From: SoCal
Default

Awww come on, folks!
 
Reply
Old Mar 3, 2010 | 09:33 PM
  #3  
aviator's Avatar
aviator
Elite HDF Member
Joined: Aug 2007
Posts: 4,415
Likes: 5
From: San Antonio, Republic of TEXAS
Default

Originally Posted by JustDave71
Anyone have any ideas approximately how much force is generated on average?

Sorry...don't know the tech term, but basically, how much resistance would be needed at the top swingarm bar to moderate swingarm movement?
if I understand your question..... the answer lies in the concept of force; which is used to describe an influence which causes a free body to undergo an acceleration. Force can also be described by intuitive concepts such as a push or pull that can cause an object with mass to change its velocity (which includes to begin moving from a state of rest). An applied force has both magnitude and direction, making it a vector quantity. Newton's second law can be formulated to state that an object with a constant mass will accelerate in proportion to the net force acting upon and in inverse proportion to its mass, an approximation which breaks down near the speed of light. Newton's original formulation is exact, and does not break down: this version states that the net force acting upon an object is equal to the rate at which its momentum changes.

Related concepts to accelerating forces include thrust, which is any force which increases the velocity of the object. drag, which is any force which decreases the velocity of any object, and torque, which is the tendency of a force to cause changes in rotational speed about an axis. Forces which do not act uniformly on all parts of a body will also cause mechanical stresses. mechanical stress can remain embedded in a solid object, gradually deforming it.

oh, I'm not an engineer, but I did stay at a Holiday Inn last night.
 
Reply
Old Mar 3, 2010 | 09:38 PM
  #4  
DyNaBoB's Avatar
DyNaBoB
Elite HDF Member
Joined: Feb 2006
Posts: 3,818
Likes: 2
From: Twin Cities
Default

Originally Posted by aviator
if I understand your question..... the answer lies in the concept of force; which is used to describe an influence which causes a free body to undergo an acceleration. Force can also be described by intuitive concepts such as a push or pull that can cause an object with mass to change its velocity (which includes to begin moving from a state of rest). An applied force has both magnitude and direction, making it a vector quantity. Newton's second law can be formulated to state that an object with a constant mass will accelerate in proportion to the net force acting upon and in inverse proportion to its mass, an approximation which breaks down near the speed of light. Newton's original formulation is exact, and does not break down: this version states that the net force acting upon an object is equal to the rate at which its momentum changes.

Related concepts to accelerating forces include thrust, which is any force which increases the velocity of the object. drag, which is any force which decreases the velocity of any object, and torque, which is the tendency of a force to cause changes in rotational speed about an axis. Forces which do not act uniformly on all parts of a body will also cause mechanical stresses. mechanical stress can remain embedded in a solid object, gradually deforming it.

oh, I'm not an engineer, but I did stay at a Holiday Inn last night.


 
Reply
Old Mar 3, 2010 | 09:51 PM
  #5  
Ruralmed's Avatar
Ruralmed
Road Captain
Joined: Apr 2008
Posts: 533
Likes: 2
From: Eugene, OR
Default

HD R&D measured 100g's of force on the rear swingarm to fender mount of the Rocker during factory tests.
 
Reply
Old Mar 3, 2010 | 10:22 PM
  #6  
JustDave71's Avatar
JustDave71
Thread Starter
|
Outstanding HDF Member
Joined: Jul 2008
Posts: 2,115
Likes: 5
From: SoCal
Default

OK.

let me clarify

the swingarm bumpers on a standard softail. The things that keep the wheel from rubbing inside the fender and the swingarm from slamming into metal

at that area on the bike...how many pounds of force are found on average?
 
Reply
Old Mar 4, 2010 | 12:57 AM
  #7  
DyNaBoB's Avatar
DyNaBoB
Elite HDF Member
Joined: Feb 2006
Posts: 3,818
Likes: 2
From: Twin Cities
Default

for one the rubber bump stop doesnt prevent the tire from hitting the fender it stops the swingarm from hitting the oil tank...........as far as #s of force to mush it, who knows
 
Reply
Old Mar 4, 2010 | 03:08 AM
  #8  
JustDave71's Avatar
JustDave71
Thread Starter
|
Outstanding HDF Member
Joined: Jul 2008
Posts: 2,115
Likes: 5
From: SoCal
Default

Originally Posted by DyNaBoB
for one the rubber bump stop doesnt prevent the tire from hitting the fender it stops the swingarm from hitting the oil tank...........as far as #s of force to mush it, who knows
Are you trying to be a dick about this?

Funny...I asked a sincere question, for a legitimate reason. Can't for the life of me see what there is to be sarcastic about.
 
Reply
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old Mar 4, 2010 | 09:12 AM
  #9  
DyNaBoB's Avatar
DyNaBoB
Elite HDF Member
Joined: Feb 2006
Posts: 3,818
Likes: 2
From: Twin Cities
Default

howz that being a dick i said wut the rubber bump stop was for and as far as #s of force to mush it i dont know or who would know....why dont you give more info like why you are wondering about pounds of force on the bump stop, are you thinking about riding on the bump stop if so, yes you can there are guys on here doing it
 
Reply
Old Mar 4, 2010 | 07:54 PM
  #10  
Rakthi's Avatar
Rakthi
Road Warrior
Joined: May 2009
Posts: 1,493
Likes: 94
From: Belgium
Default

Send an email to Progressive Suspension and ask them how much lbs/force is needed to bottom out rear suspension on a softail. That force should practically be the same as the one you get on the bumper.
 
Reply



All times are GMT -5. The time now is 01:43 PM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE