Gerald
| 28" Python | 20" Python | |
|---|---|---|
| Roll-out | 2010-04 | 2011-01 |
| Pivot-Angle | 62,5 | 62 |
| Trail | 33 | 22 |
| Seat-Height | 25 | 27 |
| BB-Seat | 30 | 31 |
| Ground-Clearance | 11 | 14 |
| Wheelbase | 137 | 90 |
| Weight | 16,9 | 13,9 |
| BB-FWA | 40 | 53 |
| Turning-Circle | >6m | 1,5 |
| Front Tubing | 50x20 | 50x20 |
| Wheelsize | 28 (622) | 20 (406) |
| CG (%) | 54 | 46 |
Generally the two pythons ride quite different.
The old 28" version is hard to ride if tight corners need to be mastered. But on reasonable strait lanes, it runs just great and really fast. The reason for of the huge turning circle is that the front mudgard touches the Seat very early. This bike sports a rear suspension, but it is a bit different from Jürgens construction.
The 20" version is quite different, as is to expect. The short wheelbase and the fact that the front part goes under the seat while cornering, the front part can bend 90*. In practice, doing some continuous circles of about 2,5m diameter at a rather unreasonable speed - if you don't get thick. Top Speed is 44km/h yesterday, 8th and highest gear and most probable as fast as it can go. The bike does not have a suspension, but rather thick tires (20" x 1,9).
The measured speeds are, obviously, only short term sprints, not even 200m.
The pivots of the two bikes are quite different. The 28" Python uses industry standard ball bearings. They worked great, had no play - but there problem is rust. After this winter, they are nearly finished.
The 20" Python use standard 1 1/4 head tube bearings.
The front part of the 20" Python actually comes from the sailing python trike I started last autumn. I had postponed the project though the winter but still have the two trike rear parts - one 130cm wide the other 85cm. Maybe it is some kind of python option system bike :-). The two trikes and the bike share the front part as well as the rear wheels. Even for the bike. If you take a close look at the rear wheel, you see the single sided attachment.
The front tubing of 50x20 might sound over sized, but since the material is only standard grade construction Aluminum Alloy (AlMgSi0.5 or something) this is required.
Gerald
