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Jockey wheel conundrum

  • This topic has 8 replies, 7 voices, and was last updated 12 years ago by Jack Osbourne snr.
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  • May 23, 2014 at 11:30 am #21508
    daviddb

    So, being a bear of small brain, why is it that Ultegra jockey wheels, or “Tension & Guide Pulley Kit” as they would have it, come with one ceramic bearing and one plain steel bearing?

    Supplementary question if I may, which bearing gets the higher and which the lower position and why does the plain bearing spin much more freely.

    Yours in a state of some perplexity…. 😐

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  • May 26, 2014 at 8:35 am #795433
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    Jack Osbourne snr

    Flying Scot wrote:Go

    Flying Scot wrote:
    Go campag….they have upper and lower marked on the wheels last time I looked!

    As do Tacx generic replacements… As do SRAM.

    That’s me got another reason not to use Shimao lol :))

    May 25, 2014 at 9:34 pm #795431
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    joemmo

    Easiest way to select the
    Easiest way to select the right jockey wheel is that the top one is usually marked ‘centron’and should have a small amount of side travel on it.

    May 25, 2014 at 10:52 am #795429
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    daviddb

    Thanks everso for the infos –
    Thanks everso for the infos – problem solved. Hurrah! <:P

    May 24, 2014 at 8:14 am #795427
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    Flying Scot

    Go campag….they have upper
    Go campag….they have upper and lower marked on the wheels last time I looked!

    May 23, 2014 at 10:13 pm #795425
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    pauldmorgan

    AFAIR the sideways play in
    AFAIR the sideways play in the top wheel also minimises chattering if the indexing is slightly off.

    May 23, 2014 at 8:56 pm #795423
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    matthewn5

    Plain steel at the top, it
    Plain steel at the top, it has rubber bushings that allow it to move sideways on the axle very slightly and cushion the shift for that characteristic soft Shimano shift action.

    If you like a crisper shift, swap out the top one for an aftermarket ceramic bearing jockey wheel and get very crisp shifts indeed, you’ll need to refine your shifting technique, but after that you’ll appreciate it.

    May 23, 2014 at 12:38 pm #795421
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    daviddb

    Ah-ha! Well now…. the
    Ah-ha! Well now…. the plain steel bearing has more side to side movement than the ceramic bearing so we’re possibly heading towards the plain steel at the top and ceramic in the lower position. The steel bearing one is also marked as being directional and the ceramic one isn’t….

    So we’re partway there. There are about 142 you-bend vids on jockey wheels but the first three I looked were silent on the subject and as for the remaining 139, well, life is short and I’m planning a spin round Thirlemere this afternoon rather than getting google-eyed.

    Thanks for the infos…

    May 23, 2014 at 12:08 pm #795419
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    Chuck

    Dunno about the rationale
    Dunno about the rationale behind the bearing materials, but the ‘guide’ one goes at the top and the ‘tension’ one goes at the bottom. When I replaced my 105 set the other week one of them said which it was on it- one of them was apparently directional too. I had to squint to see that though!

    The guide one is supposed to have more side-to-side movement in it but dunno which of the 2 materials that would be.

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