On Fri, 20 Nov 2015 07:30:57 -0600, AMuzi <
a...@yellowjersey.org> wrote:
>On 11/20/2015 5:06 AM, John B. wrote:
>>
>>
>> I spent some time cleaned and lubed a 105 rear derailer that I'll
>> probably use in the new(old) bike. I noticed that the idler pulleys
>> are extremely loose and wonder whether they should be replaced. The
>> lower one is probably not too important but the upper pulley is what
>> derails the chain and I would think that if it wiggled from side to
>> side it would effect shifting.
>>
>> Comments ?
>> --
>>
>> Cheers,
>>
>> John B.
>>
>
>It's not a bug, it's a feature.
>Shimano calls the top roller design 'centeron pulley'. It's
>supposed to slide laterally so as to center under the
>sprocket without rocking. Various materials were used across
>years and models, the most expensive of which have ceramic
>liners over a ceramic bush.
>
was work and it wiggled, i.e. tilted back and forth.