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.
If normal bikes can live with some cross chain, so can a re***bent.
JonB
|
