My common sense tells me that rotating weight is a factor that affects acceleration and deceleration more than steady state. Are you finding different?
Blue Dream: Maxarya Ray 2 Semi Recumbent w/high eff mid drive
- Thread starter neptronix
- Start date
I'm not finding different. Low weight makes the bike easier to spin from a stop, that's about it.
Less acceleration on a recumbent when descending and less deceleration when climbing would be very beneficial.
Found an interesting blog on this, done on a 700c wheel:
Rotating Weight
That's a very substantial difference from 270g of rotating weight.
Maybe i actually want a carbon front wheel.
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It also affects the gyroscopic forces and is an unsuspended mass, so interacts with the suspension; though it mostly matters for traction rather than comfort.
Gyroscopic precession is largely a non-issue on bicycles, when compared too, say, motorcycles - more wheel mass and higher RPM. You can alleviate a portion of unsuspended wheel mass by careful tire selection and inflation.
PaPaSteve
10 kW
Back when winning races with aerodynamic streamlined bicycles was important to me . . .
Coast down testing was an immensely informative source.
Using a Cateye HB 100 cycle speedometer that can download a .csv file to a spreadsheet.
This speedo has a spoke magnet with reed switch so can be quite accurate measuring device.
It takes some time to calibrate the tire roll out as I would take the average of 5 revolutions at correct tire pressure on a straight line.
Me on the bike as ridden using a carpenters square to find axle center lined up on valve core center and then mark the ground.
Always needed a helper for this task.
I'd start at the same place on a bowl shaped hill where it rolls down one side then transitions up the other side.
How far it rolled up the other side completed total distance.
The most valuable data was comparing the time and distance for each wheel revolution in the spreadsheet.
This revealed any advantage in acceleration or losses from deceleration.
Super useful for tires and wheel measuring as well.
Also have a couple of PowerTap power meter wheels but found them to be most useful for strength monitoring.
Probably too much info . . .
Coast down testing was an immensely informative source.
Using a Cateye HB 100 cycle speedometer that can download a .csv file to a spreadsheet.
This speedo has a spoke magnet with reed switch so can be quite accurate measuring device.
It takes some time to calibrate the tire roll out as I would take the average of 5 revolutions at correct tire pressure on a straight line.
Me on the bike as ridden using a carpenters square to find axle center lined up on valve core center and then mark the ground.
Always needed a helper for this task.
I'd start at the same place on a bowl shaped hill where it rolls down one side then transitions up the other side.
How far it rolled up the other side completed total distance.
The most valuable data was comparing the time and distance for each wheel revolution in the spreadsheet.
This revealed any advantage in acceleration or losses from deceleration.
Super useful for tires and wheel measuring as well.
Also have a couple of PowerTap power meter wheels but found them to be most useful for strength monitoring.
Probably too much info . . .
SlowCo
1 MW
Just a thought when I saw the photo with the long cranks. Maybe you've done this already or it isn't possible but:
PapaSteve, that's awesome.
I think now that i have NVH down to a low roar, aerodynamics come next and i may need to reference that post..
Ah, the real win is to actually point it forward, that moves the pedal up ~5mm and might allow me to remove the ring.
Pointing it forward doesn't push me backwards on the bike, which is a huge plus. Moving it all the way upward would.
I think now that i have NVH down to a low roar, aerodynamics come next and i may need to reference that post..
Ah, the real win is to actually point it forward, that moves the pedal up ~5mm and might allow me to remove the ring.
Pointing it forward doesn't push me backwards on the bike, which is a huge plus. Moving it all the way upward would.
The Toecutter
100 kW
- Joined
- Feb 8, 2015
- Messages
- 1,473
Where do you see a frame kit for sale?
I only see a bare frame, and not a full-on frame kit that has the spindles, tie rods, ect. I want another one to make a quad with!
ZeroEm
1 MW
It's just a frame! No spindles.
