Technical & Reference Section > Tech and Restoration

Chainring Top Hats

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oldtired:
so the majority of bb are either 19mm or 22mm so why do chain rings still come with the one piece size hole   so that you kneed a top hat , which you can never fookin find in the tool box   :tickedoff: :tickedoff:   :2funny: :2funny: are the spline drive ones reliable? 

Dannywhac:
I use a Tree spline drive and it's fookin lovely  :daumenhoch:

Just don't use them on Ti axles.

oldtired:

--- Quote from: dannywhac on February 28, 2012, 12:31 PM ---I use a Tree spline drive and it's fookin lovely  :daumenhoch:

Just don't use them on Ti axles.

--- End quote ---

interesting ,  why not ?  been looking at the Tree cro mo one  :smitten:

motomagII:
fsa chainrings are 19mm onkly so not top hat

Dannywhac:
More of a manufacturers recommendation - the Ti's way softer than the treated splined part of the sprocket and with the larger forces placed on the axles in a smaller point (as the crank arms have a larger contact area so force spread less) makes the axle more prone to failure.

Saying that, I've only ever seen one 'smooshed' Ti axle from a spine drive sprocket, and that was on a bike that it's owner didn't maintain it (loose crank arms anyone?) Sprocket was still fine though  :daumenhoch:

If you get a Tree Sprocket (and they are very nice) give the splines on the axle a little bit of a clean up with a wire brush (not too much though) as they're a snug fit :)

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