[python] 20" python, modified

  • From: Ghislain PILLET <gh.pillet@xxxxxxxxxx>
  • To: python@xxxxxxxxxxxxx
  • Date: Sun, 24 Apr 2005 18:18:39 +0200

20" wheels, after modifications

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Version 1 was : 20" wheels, 60° pivot, -19cm trail, 20cm heigh ot seat, bb-seat diff 25 cm, ground clearance 14cm.



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Version 2 is now : 20" wheels, 60° pivot, -14cm trail, 30cm height of seat, bb-seat diff. 20cm, ground clearance 24cm

Conditions first test : low speed, 6 to 10 km/h, mainly flat ground.

due to increase of seat height, I guess : noticeable wider range of stability in turns, easier to correct a turn initiated too sharp.

due to modification of trail angle, I guess : dampening of self centering effect giving more flexibility on turning, whith hips or with legs, or both.
What I wd call "typicals pendulary oscillations" of the forward part generated by stronger alternative push on pedals to exit a turn initiated too sharp are much more dampened, rider can keep control on them, and bring the balance back ; on the previous version they led most of the time to a fatal loss of balance.

seat height : balance can still be restore with finger tips.

conclusion after first test is : a more forgiving 20" python easier to ride.
More testing to come, at higher speeds and dowhill, with no choice, at first, for hands : stuck on brakes, and nowhere else !

After having done more testing, all conditions, flat, up, down : I'm feeling safe at speeds up to 15 kmh with a encouraging flash of maximum speed 21 kmh ! My question "How do python uphill climbers come back home ?", changed to " do they come back home slow or fast ? "
Ray, according to your theoretical works, and providing my input is right, stable conditions on this python should appear at 25 kmh !
Cordially,
Ghislain.



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