I always found that Suntour rear derailleurs had a very nice way of 
providing a way to set the big ring/small cog position, presuming you've 
selected rings and max cog sizes within a unit's specifications. It was an 
embossed dot on the outer cage side plate that was to be aligned with the 
mark on the cage spring housing, just across the plastic seal/bushing from 
the cage. B-screw adjustment would finalize the adjustment to optimize.

Short cage on triples was an interesting MTB phase just before the 
MicroDrive (and Shimano's answer) kicked in. The overt marketing of 
requisite rider skill attracted many who didn't have it.

Coffee and breakfast with a short cage XC Pro RD in front of the computer.

Andy Cheatham
PIttsburgh

On Friday, July 24, 2015 at 6:17:22 PM UTC-4, Ron Mc wrote:
>
> two things to look at on optimizing chain length.  On biggest ring and 
> biggest cog, your RD should be forward no more than 45 degrees, if it's 
> less, the chain's too short.  On your smallest and smallest, the length of 
> chain running between the two jockey wheels should be pointing no higher 
> than horizontal, if it is, the chain is too long.  There should be enough 
> chain wrap on most long cage derailleurs to make this do-able.  
> Something else, you're stretching the RD cage return spring farther than 
> it was designed to go, and it may take a set.  .  
>
>
> On Friday, July 24, 2015 at 4:11:07 PM UTC-5, A. L Young wrote:
>>
>> On the Atlantis I was switching from downtube to bar end shifters (front 
>> derailer only) and did this during a test ride. 
>>
>> http://flic.kr/p/w9Ntbb
>>
>> I swapped the cassette a while back. New one has a higher-toothed low 
>> gear. I guess I forgot to resize the chain length.  After the addition of a 
>> link I can happily if awkwardly ride again in the big-big combo.  :)
>>
>> Aaron "Awkward and Happy" Young
>> The Dalles, OR
>>
>

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