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Mar 8th 2021, 06:04 PM   #1
 Sentinel's Avatar
 
  Jun 2016
  Poor Tortured

  2019 Nada
Front/Rear Weight Bias Engineering

I took my center-stand off to weigh it: 6.6lbs.
And I bought a Shorai.
So I was thinking about weight and weight distribution.
I was looking at my bike and noticed that the mass of it and the visual gravitational center, is pretty far forward.
Then I realized the bike was actually designed in perfect balance - with the rider aboard.
That was what made it look imbalanced and so front-heavy: the gap where the rider would be.
Made me wonder whether they design the bikes balance with the rider as part of the package.
Seems like they would.
My old Ninja 1000 had a perfect fore-aft balance without me on it, so when I was riding it was actually heavier on the rear than the front.
Anyone know?
Mar 9th 2021, 05:48 AM   #2
 tod701's Avatar
 
  Jan 2016
  Stanwood

Quote:
Originally Posted by Sentinel
I took my center-stand off to weigh it: 6.6lbs.
And I bought a Shorai.
So I was thinking about weight and weight distribution.
I was looking at my bike and noticed that the mass of it and the visual gravitational center, is pretty far forward.
Then I realized the bike was actually designed in perfect balance - with the rider aboard.
That was what made it look imbalanced and so front-heavy: the gap where the rider would be.
Made me wonder whether they design the bikes balance with the rider as part of the package.
Seems like they would.
My old Ninja 1000 had a perfect fore-aft balance without me on it, so when I was riding it was actually heavier on the rear than the front.
Anyone know?
The rider's weight and potential body positioning should always be factored in.
Mar 9th 2021, 06:17 AM   #3
 Transported's Avatar
 
  Jan 2016
  Portland

  2016 R1
Depends on the style of bike.

Is it based on performance or looks and feel?
Mar 9th 2021, 07:13 AM   #4
 Tripledij's Avatar
 
  Jan 2016
  Custer WA

  Aprilia Tuono 1100 and Moto Guzzi V7 III Milano
Quote:
Originally Posted by tod701
The rider's weight and potential body positioning should always be factored in.
Yup



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Mar 9th 2021, 03:08 PM   #5
 
  May 2016
  PDX

  2016 ZX-10R; 2021 Z H2 SE
I don't know if this is the correct answer.

I took my rider training courses in Iowa >25 years ago (!!). They spent part of the first day telling us that we as motorbikers sat over the rear for more traction and lightened steering effort. The position worked when braking, as the weight transfer forward then would load the front tire, giving it additional grip.

To weight the front end would compromise rear traction, and tend more towards inducing a "stoppie" effect on the brakes, or a front slide, both of which may impede control.

As most of us were on motocross bikes, they also told us to "sit down," before slamming on the brakes, which seemed like decent advice.
Mar 10th 2021, 07:21 AM   #6
DGA
 DGA's Avatar
Moderator
 
  Jan 2016
  PDX

  An Ape and a Husky
If you take a look at a race or super sport bike, maximizing weight over the front wheel tends to be high up on the design list. It helps maximize front tire grip. Like anything in regards to bike setup though, it's a balance between straight line stability, agility, grip, braking and acceleration performance, etc... Too much focus in one area tends to take away from another. Rider movement and positioning helps (or detracts) from any one of these, but only to a point.

A lot of design decisions are based on bike's focus. More extreme version of it would be MotoGP. Looked at from a technical stand point, difference in bikes from one year to the next and between different manufacturers will become pretty apparent as they focus on particular areas of bike's performance on sections of track, without giving up much in other areas of performance. They all go around the same track, but every bike has it's strong sections and weak ones as well. Also a large portion of setup tends to cater to their talent's riding style.
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