New KH rail adaptor

I put a SH/Kinport style one on my trials uni with a thomson post. It's
holding up fine.

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like i have said in many posts kris is only going to make stuff or use
stuff that will hold up because well why wouldnt he

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ok. I suppose I'll have to wait and see how people like them. I'm going
to stick to the normal posts though, I think.

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Given that rails are the standard in the bike industry, quality can be
as high or as low as you want to pay for. Assuming the rail bracket is
well constructed, a rail type seatpost assembly can be very rugged.

I've been riding a Thomson elite seatpost with a wilder rail bracket for
about three years now, and it's held up to a pretty high level of
abuse.

Ben

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Ok, thanks for the info. It seems like something that has an adjustible
angle will not be as strong as a fixed thing for teh same purpose, as a
general rule.

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Fuego said:

*Ok, thanks for the info. It seems like something that has an
adjustible angle will not be as strong as a fixed thing for teh same
purpose, as a general rule. *

Nonsense. Anything with a bolt or clamp can be just as strong as a
single piece. Seatposts are always clamped onto frames. If done
correctly, they will never move. The same is true for a seatpost. When
properly installed it will never move.

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yeah, but a clamp like a seatpost has a lot of area to have a bunch of
friction going for it. (that sentence didn't make sense.)

I think I'm thinking of a different design for an attachment than you.

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Fuego said:

*yeah, but a clamp like a seatpost has a lot of area to have a bunch
of friction going for it. (that sentence didn't make sense.)

I think I'm thinking of a different design for an attachment than you.
*

On a good seatpost (2 bolts; I think 2 bolts is the only thing that will
work on a unicycle with all the extra forces) the friction doesn't
matter. The bolts are effectively pulling against each other. The only
way something can slip is if one of the bolts' threads slip. Which is
not likely.

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Fuego said:

*
SO, what do you think about these new seatposts? they're likely to
become the standard for all unicycles, so I'm wondering if they will
be a quality standard. *

I hope they don't become industry standard :eek:

I have a Wilder bracket which looks pretty much the same as the KH rail
adapter. It works fine, but it seems to add a lot of unnecessary
welding and potential weakspots, and also raise the seat by a fair
amount (problematic if you are short and use a Coker).

In order to make the bracket strong enough for MUni use, it has to be
overbuilt and much heavier than the rails on a bike (how often does your
bikeseat smash into the ground?). In my opinion, bicycles need rails
because they need to have forward and backward adjustment as well as
angle adjustment; whereas unicycle seatposts only need angle adjustment.
You might be able to use a variety of lightweight bicycle seatposts,
but the heavier bracket kind of cancels all that out.

A really elegant solution would be to have an adapter to adapt a bicycle
seatpost to the unicycle seat. I know Scott Wallis made a really nice
carbon fibre adapter (I've tried my best but can't seem to pull up that
thread). If someone else can post a pic to illustrate- I reckon that
is that should be the industry standard.

Ken

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Fuego said:

*Apparently all the new KH unis are shipping with a bike style rail
adaptor.*

The KH20 Trials does not have the rails.

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Personally I think the industry standard for high-end trials and
mountain unicycles should be a thomson directly attached to a cf base.
It is just as strong, if not stronger than a thomson witha rail
adapter, and it's lighter than a thomson with a rail adapter. Not to
mention you still get the good adjustability. The only problem is how to
figure out how to distribute the clampin action on the other side of the
cf base. I'm gonna try a small wooden plate in there and see what
happens...

The KH rail adapters sould be plenty strong, and definitely stronger
than the old posts. Just think about the placement of the welds on the
seat, and how much weaker the lever is made.

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gerblefranklin said:

*Personally I think the industry standard for high-end trials and
mountain unicycles should be a thomson directly attached to a cf base.
It is just as strong, if not stronger than a thomson witha rail
adapter, and it's lighter than a thomson with a rail adapter*

Too expensive. And industry standards usually have something better than
them.

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Fuego - the reason you've broken two standard uni seatposts is because
they aren't very strong. In general they're made by the welded seam
method, rather than using extruded tubing. Tubes with welded seams are
much weaker than extruded tubes. (Have a look inside yr standard
seatpost and you'll see a welded line, where the tube has been rolled
into a cylinder and welded together.) For the majority of riders a
standard seatpost is fine, as its never very highly stressed. In my
opinion on a uni its preferable to have an average quality bike seatpost
than a standard uni seatpost, as it will be much stronger.

TheObieOne3226 said:

*On a good seatpost - 2 bolts; I think 2 bolts is the only thing that
will work on a unicycle with all the extra forces... *

Yeah, I've often wondered why exactly unicyclists seem to prefer the two
bolt seatpost design. Has anyone tried a single bolt seatpost with any
success?

+()|\|>-

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gerblefranklin said:

*Personally I think the industry standard for high-end trials and
mountain unicycles should be a thomson directly attached to a cf base.
*

ooh gee, where have we seen that before? maybe at the Cal muni week-end
perhaps? stop with the brown nosing.

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gerblefranklin said:

*Personally I think the industry standard for high-end trials and
mountain unicycles should be a thomson directly attached to a cf base.
It is just as strong, if not stronger than a thomson witha rail
adapter, and it's lighter than a thomson with a rail adapter. *

actually it would be weaker, and the first thing to give would be the
carbon fiber. I've seen a seat like that break on a 4' drop. When you
attach the seatpost directly to the seat, all the force to the carbon
fiber is disributed in two places that are closer together than the four
that it is designed for.

I have a thompson post with a wilder adapter that has a gusset welded to
the back where the rails had snapped off. it's heavy but when it breaks,
the seatpost bolts snap or bend which is less than a 1$ fix.

mike

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The reason the KH24 and KH29 unicycles now come with a rails adaptor is
that it makes an incredible difference to saddle comfort to be able to
properly adjust saddle angle to personal preference.

The reason the KH20 trials doesn't come with one is that most riders
prefer the saddle at a fairly common saddle angle for trials (the one it
comes with), and the rails interfere a little bit with grabbing seat out
front.

The rails adaptor is similar to the original Canadian-made version
except that it has an additional reinforcement bar across the back of
the bracker where the rails attach to the plate.

Kris

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I use the KH rail adapter for my Yuni 29"er with miyata base and GB4
stiffner. It has given me no problems, and being able to tilt the seat
angle helps a lot with comfort.

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danger_uni said:

*
The rails adaptor is similar to the original Canadian-made version
except that it has an additional reinforcement bar across the back of
the bracker where the rails attach to the plate.

Kris *

thats good to know since i broke two of them right at the very spot.

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