Here we have a modified (Improved Design) this is more suited to the larger person, Longer Arms and Longer legs than a child. Not with excessive weight I would rate this as being suitable up to 100 kilo
After all it is still basically a child's bike, Now getting down to basics or modifications to the original Raleigh Twenty design:
Brakes originally had canter lever type which I personally never had any problem with, but a lot of people seem to find them inferior to V brakes.
Head Post steering changed to incorporate front suspension, and a longer raised handlebar
Top Tube lengthened for extra knee clearance from handlebar
this also gives more clearance from pedal to front wheel
Gears 3 speed improved to 6 speed with a derailleur changer
This gives a basic Idea of the possibilities and Improvements that can be made.
Very interesting design. The only problem is that it does seem to perpetuate the low ground clearance of 406 wheeled Twenties. Its a catch 22, if you want off road capacity you need 406 for tyre choice, yet you will ground out on everything. I recently modded a Raleigh RSW MK2 to fit 451 rims, not quite as sturdy as the Twenty but would have great ground clearance even on 406's. Bikes such as the RSW or Moulton Mark 3 designed for 369 wheels would make interesting 406 conversions and indeed an interesting basis for the kind of redsign shown above.
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