Jon Bendtsen wrote:
> Adam Kadlubek wrote:
>> 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.
>
> Then combine a rohloff/nuvinci + a schlumpf drive == 0 cross chain.
No cross chain, but large expense. :(
> If normal bikes can live with some cross chain, so can a re***bent.
>
Cross-chaining becomes much less of an detriment with a long chain line.
--
Tom Sherman - Holstein-Friesland Bovinia
The weather is here, wish you were beautiful
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