Splined

Nobody seems to have replied yet, so here's a quick explanation:

Most unicycles (certainly the less expensive ones) have the cranks
attached to the axle using a tapered square shape on the axle, commonly
known as "cotterless" (to distinguish it from the older "cottered" axle
with a cotter pin). These are the common fittings for cranks on bikes
(almost all bikes for the past couple of decades have used this
cotterless type of crank). It's a pretty strong way of holding the
cranks and is much better than the old cottered method, but...

Unicyclists who do lots of jumping (i.e. trials and muni riders) often
put more stress on the cranks than the square taper can take, making
them come loose, creak, and wear out. The solution is to use an axle
with splines (lots of small ridges, a bit like fine cog teeth) that fits
into an appropriately shaped hole in the crank. This gives a much
stronger interface and helps to prevent the loosening problems. The
downside is it's more expensive to make splined components (so they cost
more to buy) and because it's not a standard bike fitting the choice of
cranks is more limited (different makes of splined axle use different
numbers of splines, so cranks and axles can't be mixed). But if you're
doing heavy riding the strength gains are worth the extra cost. Common
makes of splined hub are KH, Onza, QuAx and Profile.

For normal riding (and the type of cross-country/light muni I tend to
do), the less expensive square taper hubs are strong enough as long as
you make sure they don't get loose.

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rob.northcott - Unofficial level 2, on a good day
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Thank you very much. I should probably get a splined uni because even
though my Schwinn is one of the toughest I've ever incountered, I don't
think the cranks like my stunts very much.

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TheoELind - 5 year schwinn rider
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Does anyone know any unicycle hub with 48 splines?
The thing is that i found these really cool white cranks that i would
love to use on a unicycle.

[image: http://www.deitycomponents.com/Cranks/testmain.jpg]

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fexnix - Level 4 here i come!

Recycle your Unicycle!
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thsy are all preety now, but after a few petal grabs and grinds they
look like [censored]. take your cranks and spray paint them white!

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DK - level 11 unicyclist
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those cranks are sexy...

I dunno about hubs for 'em though...

--
Fuego - Ride to Ruin, and a Red Dawn!

"Unicycling is more about the center of concentration than the center of
balance."

If you don't want us riding on your concrete, don't make it in such damn
interesting shapes!
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Profile hubs are 48 splined. I don't see why you'd replace profile
cranks with a lifetime warranty with some other cranks just because of
the paintjob.

--
gerblefranklin - Trials Unicyclist

http://gallery.unicyclist.com/Trials-Muni

"Peace cannot be kept by force. It can only be achieved by
understanding."-Albert Einstein
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gerblefranklin said:

*I don't see why you'd replace profile cranks with a lifetime warranty
with some other cranks just because of the paintjob. *

I do!!!!!!!!!!!!!!!😄

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total uni - posting is good for the soul!

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gerblefranklin said:

*Profile hubs are 48 splined. I don't see why you'd replace profile
cranks with a lifetime warranty with some other cranks just because of
the paintjob. *

You would need to find out if those Deity cranks are really compatible
with the Profile hub. They could be using a different spline size/depth
than Profile even though they are both 48 spline.

Then you would need to make sure the Deity cranks are using the same
size axle as used on the Profile unicycle hub. Profile makes two sizes
of splined spindles. The Race and DJ spindles are 3/4" diameter and is
the size used for the unicycle hub. The SS is an oversized spindle (I'm
not sure of the diameter) for BMX abuse. Cranks designed for the SS
spindle will not fit on the unicycle hub. The Race cranks are the
lighter weight cranks that fit the 3/4" spindle. The DJ (dirt jumper)
cranks are heavier weight and more beefy but still fit the 3/4"
spindle.

There are cranks from other manufacturers that are compatible with the
Profile spindles. I think those cranks are made by Profile and
rebranded for a different manufacturer. So it is possible to find
cranks from another brand that will fit on a Profile hub. But you'll
have to do some double checking to determine whether they fit the
standard Race spindle or the oversized SS spindle. So be careful if you
buy different brand cranks for the Profile unicycle hub. There is no
guarantee that the new cranks will fit.

--
john_childs - Guinness Mojo

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