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Crr: real world rolling resistance?

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Crr: real world rolling resistance?

Old 05-11-22, 12:12 PM
  #76  
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Originally Posted by GhostRider62 View Post
BTW.....weight should not matter. Crr is generally thought to be load and speed independant, although I somewhat disagree with that. I am fat because I have had a lot of injuries. I promise to lose the weight. Weight is taken into consideration and really cannot be much of a factor in the Crr estimation that I provided.
Yes but your excess weight increases your frontal area and given that fat weighs less than muscle in your case that effect may be substantial. In reality your really not serious about comparing some back of a napkin calculation with two different bikes, years apart and your physical condition in no way comparable?

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Old 05-11-22, 12:30 PM
  #77  
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Originally Posted by Atlas Shrugged View Post
Yes but your excess weight increases your frontal area and given that fat weighs less than muscle in your case that effect may be substantial. In reality your really not serious about comparing some back of a napkin calculation with two different bikes, years apart and your physical condition in no way comparable?
What?

I did 10 runs under reasonably controlled conditions. Loaded them into GoldenCheetah and Gribble. Hardly back of the napkin analysis.

Physical condition is irrelevant. Increased body mass should not affect Crr. Of course, it affects aerodynamics but that would be a different thread.

I am very confident in the final Crr numbers that I recorded, I merely did not share them here.

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Old 05-11-22, 12:35 PM
  #78  
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Originally Posted by tomato coupe View Post
When you're cruising along at 250 W, all the force propelling you is transmitted to the road through that tiny contact patch under your rear tire. That's responsible for most of the increased tire wear.
Based on what?

Are you losing adhesion? I am not. I do not buy your statement at all. I also do not cruise along at 250 watts, perhaps half of that on average. Peak crank force might be 30 pounds.

OTOH, almost all braking forces are on the front tires AND they are substantial. Rear tire wear is almost all due to rear bias. My recumbent is 52/48 and I wear front tires out slightly faster but they both get changed at the same time just to keep it simple.
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Old 05-11-22, 12:59 PM
  #79  
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Originally Posted by GhostRider62 View Post
What?

I did 10 runs under reasonably controlled conditions. Loaded them into GoldenCheetah and Gribble. Hardly back of the napkin analysis.

Physical condition is irrelevant. Increased body mass should not affect Crr. Of course, it affects aerodynamics but that would be a different thread.

I am very confident in the final Crr numbers that I recorded, I merely did not share them here.
Different bikes with altered position and other resistance factors
Years apart which would affect road and environmental factors
Your physical dimensions have changed
Different power meters
I doubt the pressure gauge was calibrated to ensure consistency
How did you record your data a GPS computer or perhaps an old-school mechanical stopwatch like my HS track coach
You could have logged your flawed data on the Fugaku supercomputer, garbage in garbage out.

I assume this thread was to promote engagement or social interaction but you really can't be serious?
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Old 05-11-22, 01:12 PM
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Originally Posted by Atlas Shrugged View Post
Different bikes with altered position and other resistance factors
Years apart which would affect road and environmental factors
Your physical dimensions have changed
Different power meters
I doubt the pressure gauge was calibrated to ensure consistency
How did you record your data a GPS computer or perhaps an old-school mechanical stopwatch like my HS track coach
You could have logged your flawed data on the Fugaku supercomputer, garbage in garbage out.

I assume this thread was to promote engagement or social interaction but you really can't be serious?
Freaking Robert Chung is taking him seriously enough to give advice--that seems like a methodological endorsement to me.

I don't know anything about the subject at all, but I'm enjoying OP's obvious pleasure in solving a puzzle. What's your point in posting all that nastiness? If you don't trust OP's results, don't use them.
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