Hello Karl,
I sorry to hear you fell badly with the bike. Especially on gravel can be extra
nasty.
Slipping on any wheel (front or back) usually ends with a fall. The weight
distribution of a python makes the rear wheel prone to blocking. I have had to
some accidents because I pulled to hard on the rear brake. My solution has been
to disable the rear brake and in my later builds even neglected to provide
bossing on the rear brake. Instead I have used two brake handles both going to
one front v-brake. You can see a picture on http://en.openbike.org/wiki/Pony
Kind regards
Ellie
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