Standing on the Pegs "Lowers Your Centre of Gravity"?

Ride your BMW off the perceived safety of tarmac? Let the verbal/written adventure begin...
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gocytocis
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Standing on the Pegs "Lowers Your Centre of Gravity"?

Post by gocytocis » Thu Sep 19, 2013 4:36 pm

It's clear that getting up on the pegs gives the rider greater control of the bike off road. Many riders, even knowlegible ones, will claim that it's because you are "lowering your centre of gravity" by placing your weight on the pegs rather than on the seat. I am not a physicist, but this explanation has never washed with me.

Firstly, when folks talk about the centre of "gravity", I believe they actually mean the centre of "mass".

Second, the centre of mass of an assembly of objects, such as a person on a bike, is totally independent of where those objects are connected, or if they are even connected at all for that matter.

Third, standing on the pegs should actually RAISE the centre of mass because there is more mass of the rider distributed higher than when seated.

The dynamics of single-track vehicles is complex & beyond the comprehension of my simple mind, but I have always suspected that, contrary to popular belief, it's actually this HIGHER centre of mass that makes a bike more 'flickable' than a low centre of mass. The reason is because of the increased leverage that the higher centre of mass gives the rider over the bike. I also believe that regardless of whether the overall COM has been raised or lowered, the more important factor is that the COMs of the bike and the rider are 'de-coupled' by standing, thus allowing a more complex & variable relationship with the terrain.

Anyone out there smarter than me able to confirm this, or tell me I'm wrong?
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Mal S7
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Re: Standing on the Pegs "Lowers Your Centre of Gravity"?

Post by Mal S7 » Thu Sep 19, 2013 5:24 pm

Sounds like a much better explanation to me.
But I flunked physics.

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Steve in Golden
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Re: Standing on the Pegs "Lowers Your Centre of Gravity"?

Post by Steve in Golden » Thu Sep 19, 2013 5:57 pm

This comes up on advrider often.

Supposedly having your full weight on the pegs instead of most of it on the seat is more better for maneuvering the bike in rough territory.

I didn't know until just now that it is illegal to ride on the street standing on the pegs in many places. Figures.

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gocytocis
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Re: Standing on the Pegs "Lowers Your Centre of Gravity"?

Post by gocytocis » Fri Sep 20, 2013 11:22 am

Steve in Golden wrote:I didn't know until just now that it is illegal to ride on the street standing on the pegs in many places. Figures.
I assume you're in BC Steve (?). If so, I understand that yours is one of the provinces where standing on the pegs, on ANY public road, paved or not, is illegal! Another clear case of law-makers being ignorant of the sport of motorcycling, and what constitutes safe & proper technique on a bike. :x
I'd gladly take a ticket for standing on the pegs just to have the chance to challenge it in court! :D
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'07 G650x

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gocytocis
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Re: Standing on the Pegs "Lowers Your Centre of Gravity"?

Post by gocytocis » Fri Sep 20, 2013 11:32 am

Steve in Golden wrote:This comes up on advrider often.
You're right! I just did a little search on advrider and opinions abound. Plenty of folks over there willing to emphatically state that standing on the pegs lowers your COG too. Again, I'm no Physicist, but there is simply no way for a rider to lower the COG of a motorcycle, unless of course he's laying underneath it! :lol:
'72 R75/5
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melville
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Re: Standing on the Pegs "Lowers Your Centre of Gravity"?

Post by melville » Fri Sep 20, 2013 11:57 am

gocytocis wrote:
Steve in Golden wrote:This comes up on advrider often.
You're right! I just did a little search on advrider and opinions abound. Plenty of folks over there willing to emphatically state that standing on the pegs lowers your COG too. Again, I'm no Physicist, but there is simply no way for a rider to lower the COG of a motorcycle, unless of course he's laying underneath it! :lol:
I did that Wednesday, and I can't recommend it.
Call me Mel. Some years ago- never mind how long precisely- having little or no money in my purse, and nothing particular to interest me at home, I thought I would ride about a little and see the other parts of the world.

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Steve in Golden
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Re: Standing on the Pegs "Lowers Your Centre of Gravity"?

Post by Steve in Golden » Fri Sep 20, 2013 12:55 pm

melville wrote:
gocytocis wrote:Again, I'm no Physicist, but there is simply no way for a rider to lower the COG of a motorcycle, unless of course he's laying underneath it! :lol:
I did that Wednesday, and I can't recommend it.
What do you mean melville, I hope you didn't have a get-off!? :shock:
gocytocis wrote:I assume you're in BC Steve (?).
No, I am in Golden, CO, US of A. I used to have an uncle that lived in BC though. Beautiful place.

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melville
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Re: Standing on the Pegs "Lowers Your Centre of Gravity"?

Post by melville » Fri Sep 20, 2013 1:28 pm

Steve in Golden wrote:
melville wrote:
gocytocis wrote:Again, I'm no Physicist, but there is simply no way for a rider to lower the COG of a motorcycle, unless of course he's laying underneath it! :lol:
I did that Wednesday, and I can't recommend it.
What do you mean melville, I hope you didn't have a get-off!? :shock:
New post in my Alderpoint loop thread in Motorcycling. :oops: After some VW work this afternoon, I'll be doing a re-bling on parts of the /6. :evil:

As regards standing on the pegs, I do it for the same reason I stand up whilst descending on the mountain bike--it lets the bike move around and find its path on rough dirt without knocking me in the ass.
Call me Mel. Some years ago- never mind how long precisely- having little or no money in my purse, and nothing particular to interest me at home, I thought I would ride about a little and see the other parts of the world.

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