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weight loss/power weight ratio

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  #11  
Old 02-26-2011, 04:08 PM
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Originally Posted by ged533
metmachex quality is excellent about 20 lbs weight loss
http://www.metmachex.net/p0_0_0.htm
Did you get that in under a year?
 
  #12  
Old 02-26-2011, 10:23 PM
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Originally Posted by lo-rider
Hey, I've done my share of drag racing, @ the strip and on the street. 30# (about a tank of gas) off a 700# bike is less than 5%. And yes, you'd need a precision timing instrument to detect a difference in the 1/4-mile.
Kind of like the timing lights?

Rule of thumb in cars was 100lbs=.10 Now thats on a 3,000-3,500lb car! I agree, you may not FEEL it, but take it to the strip and you will see it in the time slips. He may not feel it now, but he is on the right track with his theroy....A few more weight saving areas and it will be a nice improvement. Look into lighter wheels, that would be the most important area to loose weight.

I know weight disadvantages all too well. I have a buddy who's bike makes less power, but I get beat every time.....He weighs less.
 

Last edited by redrubicon2004; 02-26-2011 at 10:26 PM.
  #13  
Old 02-26-2011, 11:06 PM
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A 650 lb bike with a 200 lb rider is of course 850 lbs. So 30 pounds is around 3.5%. Removing 30 pounds can't hurt, but is hardly worth the effort or cost for a torquey cruiser. Heck, I can't hardly tell the performance difference while driving my 7,500 lb Diesel pick-up when pulling a 1,200 lb car trailer with a 3,500 lb car on it vs driving with no load. There is a difference, there has to be, but I sure can't tell it when cruising down the highway, passing cars, etc.

If you've got a nice digital speedo with all the bells and whistles, do your own test. Run the 1/4 mile about 3 times and get your average. Now, add 30 pounds to the bike and do 3 more runs. How much did you lose by the added weight, all else being the same? How much money are you willing to spend to achieve those same results by lightening the bike with lightweight parts? Would you spend $1000 for 1/2 MPH?

Losing unsprung weight is great for motocross, Baja and the like, but you also need to adjust your compression and rebound damping to take advantage of the lighter unsuspended parts. On a cruiser, the unsprung weight isn't as big of an issue.
 

Last edited by HemiOrange; 02-27-2011 at 12:30 AM.
  #14  
Old 02-26-2011, 11:37 PM
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i wonder if shaving weight off my bike would make much difference when im 350lbs
 
  #15  
Old 02-27-2011, 10:11 AM
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Less weight is generally a good thing; I haven't read too many articles on "How to imrpove your bikes handling by filling the frame with lead and drinking more beer"...my own FXDXT is 607lbs on a commercial shipping scale (NOT a roadside truck scale) with 1/2 tank of gas...the handling difference is very noticable; performance is provided by a 103" motor. I've got an aluminum swingarm, aluminum rims and composite rotors...how much that all took off or in what proportions I can't say 'cause it was a complete build; all at once.
 
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  #16  
Old 02-27-2011, 12:25 PM
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Originally Posted by p51bombay
Did you get that in under a year?
3 weeks to the door
 
  #17  
Old 02-27-2011, 12:35 PM
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hmm............heard some horror stories about paying up front and waiting ages for them to deliver.
 
  #18  
Old 02-28-2011, 01:37 PM
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WhyTF would you spend that kind of money to shave off a few pounds on a heavyweight cruiser? Save your money and get a sport bike or, if you're into fast times, build a drag bike. Now THAT would be cool.
 
  #19  
Old 03-01-2011, 02:11 PM
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I like it wish I could afford to do it to mine. Screw the HATERS.
 
  #20  
Old 03-01-2011, 02:26 PM
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Originally Posted by redrubicon2004
Rule of thumb in cars was 100lbs=.10 Now thats on a 3,000-3,500lb car!
I heard the same thing about cars when I use to drag race. Quickest I ran was a 12.070. Shave off another tenth and now that's an 11.970. I would have rather had the 11.

That ratio works out to be about a 3% weight drop. That means to get the same benefit from a 650lb bike you'd need to drop about 20lbs.

You won't feel it on the street unless you drop about 100 lbs of weight.

For a cruiser (cruiser being the operative word here) I'm just not seeing the fascination with weight reduction unless you go to the track with it.
 


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