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_Code=T&Product_Code=IdlRansScr&Category_Code=IdlersALL
>>>>
>>>>
>>>> They have a long blurb on why they are better:
>>>>
>>>>
http://www.terracycle.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=T&Category_Code=IdlersALL
>>>>
>>>>
>>>> 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?
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