[python] Re: gearing on small pythons

Hi Brian,

yes, standard gearing would be to light. You would need bigger
chainrings (60 or 65).

An alternative is to shorten the cranks themselves - that is the
solution I have on my bike. Here I used a (non hollowtec) tiagra set and
shortened them to 145mm (standard they are at 170mm). At the rear I have
11-30, and on the front the 50-40-30(I am guessing).

It took some time to get use to this, but now I like the solution very
much. One automatically rides at a higher cadense: I stay at the middle
chainring up to 4Xkmh before I shift to the largest chainring, and from
there when I really strain then I can follow up to 60kmh (but only for a
short while as the cadence get really to high).

The problem is getting the right cranks to shorten down. They should not
be hollow, or not have a profile at the back of the crank (some look
like U-beams). Not sure if the old tiagras are still available or what
other shimano crank would be an option.

groetjes,
dirk

Brian Demant wrote:
> Hi Pythonists.
>
>  
> I've been wondering .. will a standard gearing not be to "light" with
> the smaller wheels. And what is the cruising speed when on flat surface?
>
>  
> An additional question (off topic) .. will a small bagage room between
> the seat and 
>  
> Kind regards, Brian
>
> On 9/4/07, *Torben Scheel* <torben@xxxxxxxxxx
> <mailto:torben@xxxxxxxxxx>> wrote:
>
>
>      
>
>         -----Original Message-----
>         From: David Mullens <davemullens@xxxxxxx
>         <mailto:davemullens@xxxxxxx>>
>         To: python@xxxxxxxxxxxxx <mailto:python@xxxxxxxxxxxxx>
>         Date: Mon, 03 Sep 2007 08:33:34 -0700
>         Subject: [python] Re: Svar: Re: Svar: Re: Max Speed 67 on
>         Delta Trike
>
>         "Bigger wheels also means larger wheelbase (to some extend),
>         which
>         results in a bigger turning circle. But on the other hand, a long
>         wheelbase could also mean more stability during high speed
>         travel. "
>
>         I think centrifugal force would be the bigger difference,
>         perhaps more
>         so on the front.
>
>          
>
>     I have a dual 700c Python - there's no added stability from
>     increased speed. I expected there would be, but high speeds is a
>     problem on it. Small wheels (front wheel close to the pivot) gives
>     more precise steering (big steering input = small effect), and a
>     more forgiving bike. I have ridden Dirk's baby-python and it is
>     easier to ride than mine at low speed. And Dirk has no problems
>     with high speed as I can read.
>
>     This is mine : http://www.scheel.net/HPV/Python/default.asp
>
>     My next python will be sporting dual 406, 451 or 507 rims.
>
>     Cheers,
>     Torben
>
>
>
>
>

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