On 28 Kwi, 00:37, Jon Bendtsen <no...@[EMAIL PROTECTED]
> wrote:
> Tom Sherman wrote:
> > Jon Bendtsen wrote:
> >> Tom Sherman wrote:
> >>> TandemFan wrote:
>
> >>> [cross-posted to ARBR for Perry Butler's amusement]
>
> >>>> We have a R[ANS] Screamer tandem and there are a few idler rollers
for
> >>>> the chain. An outfit sells toothed idlers for about $250:
>
>>>>http://www.terracycle.com/Merchant2/merchant.mvc?Screen=PROD&Store_Co...
>
> >>>> They have a long blurb on why they are better:
>
>
>>>>http://www.terracycle.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Co...
>
> >>>> What's the scoop? Does it make any difference at all, or are we
going
> >>>> to go faster?
>
> >>> Someone needs to tell Pat Franz that it is "RANS" and not "Rans".
>
> >>> While the manufacturers in question are trying to meet a price point
> >>> for their bicycles, they are not going to be putting junk chain
> >>> idlers on their bicycles [1]. Therefore, while there is room for
> >>> improvement, the gains will likely be small as drive-train friction
> >>> is a small component of total non-conservative losses, even on a
> >>> re***bent with a complicated chain-line.
>
> >> Why not avoid idlers and re***bents with complicated chain-lines?
>
> >> It might not (yet) be possible with a tandem, but for a single
> >> rider bike, cruzbike offers a short normal chain-line.
>
> > And introduces a whole other set of compromises in seating position,
>
> yeah, thats true.
>
> > weight distribution, traction on steep hills, etc. Long chain lines
are
>
> actually i dont find the traction too bad up hill. But
> we dont really have hills in Denmark, it's just flat flat
> flat compared to other places.
>
> > not necessarily a bad thing, as several issues with short chain lines
go
> > away that make wide range gearing difficult.
>
> Why would short chainlines make wide range gearing difficult?
Cross chain without guilt for instance.
--
Adam Kadlubek
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