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Old 03-06-2013, 11:38 AM   #1
J.J. McQuade
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Does weight loss/gain affect cornering?

I have recently dropped about 20lbs and usually my weight yo yo's depending on if I feel like seeing my or not. I usually stay around the 220 mark; but sometimes I baloon up to 240 or so. I have had to make a slight adjustment in how I corner based on my recent weight loss; but I also have to adjust when I put on weight as well. I know most of you track guys are skinny little bastards, so your weight stays pretty much the same I assume? Just wondering if anyone else has had to make adjustments to their cornering based on weight loss/gain. Oh, and I only ride street; but any track guy's input would be appeciated as well. Thanks guys.
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Old 03-06-2013, 11:40 AM   #2
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Does weight loss/gain affect cornering?

More weight means you have to hang off less lol
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Old 03-06-2013, 11:41 AM   #3
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You could have your suspension adjusted but I'm not sure 20lbs would justify it. You could ask Patrick
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Old 03-06-2013, 11:46 AM   #4
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Quote:
Originally Posted by Bevo View Post
You could have your suspension adjusted but I'm not sure 20lbs would justify it. You could ask Patrick
I did that after the Holidays! Bad idea; because that's when I tacked on most of weight.
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Old 03-06-2013, 03:34 PM   #5
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Quote:
Originally Posted by Posterchild2 View Post
Does weight loss/gain affect cornering?
Greatly.

When you lower your weight - you will turn in much quicker, you will accelerate much faster and you will also brake more efficiently.


This has a greater effect if the weight is removed from rotating mass, ex: Wheels, sprockets etc.

Quote:

A reduction in rotating mass is beneficial because it has a two-fold effect. Of course, it reduces the total mass (or inertia) of the bike which improves acceleration. But, it also reduces rotational inertia. Inertia is what resists changes in an objects velocity.
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Old 03-06-2013, 03:35 PM   #6
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does my gut count as rotating mass?
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Old 03-06-2013, 03:53 PM   #7
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Does weight loss/gain affect cornering?

Quote:
Originally Posted by obed View Post
does my gut count as rotating mass?
If its half full of beer. Now if it was completely full it would not rotate. But it will be a mass
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Old 03-06-2013, 04:09 PM   #8
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100lb = 0.1 second for quarter mile, so you are 0.02 second faster than before.
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Old 03-06-2013, 04:20 PM   #9
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Old 03-06-2013, 04:40 PM   #10
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Quote:
Originally Posted by obed View Post
does my gut count as rotating mass?
No, but if you put on your old-man suspenders, your lower half count as suspended mass.
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Old 03-06-2013, 04:43 PM   #11
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Quote:
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100lb = 0.1 second for quarter mile, so you are 0.02 second faster than before.
That equation only applies if you fall off a cliff.
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Old 03-06-2013, 04:45 PM   #12
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Wow. Congrats on your weight loss mission. Yes, even 10lbs weight change can make a difference in suspension behavior in corners..at high speeds
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Old 03-06-2013, 04:48 PM   #13
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Quote:
Originally Posted by BaoPee View Post
100lb = 0.1 second for quarter mile, so you are 0.02 second faster than before.
Wrong. every 12 pounds is a tenth of a sec. at the 1/4 so it adds up to sec. on a road course
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Old 03-06-2013, 04:53 PM   #14
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Quote:
Originally Posted by Bevo View Post
You could have your suspension adjusted but I'm not sure 20lbs would justify it. You could ask Patrick
Im going to say yes on the suspension because I had my ZX14 set backroad stiff at Motorcycles Unlimited....lost 20lbs and the suspension was beating my on bumps.
20 lbs made a huge difference and was very evident in the suspension setting.
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Old 03-06-2013, 05:00 PM   #15
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kidding aside, what Josh said above is right. Plus the lower the weight, the less weight transfer occurs when accelerating and braking. This is made especially worse by the fact that the rider is perched even higher above the Center of Mass of the bike, relative to the tire contact patch, so the effect of weight transfer is even more pronounced. Weigh transfer is both good and bad. The added weight over the front axle when braking helps with traction, but excessive weight transfer also upset stability when transitioning.

Even time you brake hard, you are in effect doing a push up against your own body weight on the handlebars. That gets very tiring on a track day, especially at more technical track like GSS. I was sore 2 days after I first went out there.

While it is true heavier riders don't need to hang out as much when cornering, but that really only comes into play at track paces. On the street or even back roads, you should not be riding at a pace that require hanging out much at all. Otherwise, you're going way faster than you should. The BORC guys probably think differently.
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Old 03-06-2013, 05:38 PM   #16
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Old 03-07-2013, 01:42 AM   #17
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Yes it affects suspension settings

Does it affect body postition? Depends on your style of riding and where you lost the weight.

Males carry more body mass on average above the waist than females.

Your style of riding will define how it changes

Some people stick there off the seat and keep their head more centered
Some move their upper body more off and lower

Change in mass effects grow the farther from the COG the mass is moved
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Old 03-07-2013, 02:05 AM   #18
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yes
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Old 03-07-2013, 11:29 AM   #19
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Thanks for the input guys! I don't see myself getting any smaller, so I will have Patrick adjust my suspension and see if that makes a slight difference. , he might not even think it's necessary. Volfy, you my friend are the biggest geek I have ever met! Just kidding bud!
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Old 03-07-2013, 12:20 PM   #20
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220? Lightweight! Let me know when you get man-sized...

I went from a high of 280, now down to a svelte 260 . Yes, twenty lbs made a huge difference. My next goal is 240. The 20 lbs was more in comfort and feeling more confident on the bike. I can't speak to the effect on suspension as I am not as sensitive as others (and not as fast!).

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