Unicyclist Community

Go Back   Unicyclist Community > Unicycling Discussion > General Unicycling Discussions

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 2009-02-07, 09:38 AM   #61
EB engineer
Kyle Erickson
 
EB engineer's Avatar
 
Join Date: Feb 2009
Location: West Jordan, UT
Age: 32
Posts: 20
does anyone know what brand of bearings he uses. it seems to me like low quality bearings are the major issue here. the bearings were probably not designed to have downward force applied to them. most bearings of that type are meant for rotational forces only. the bearings outer shell may be being forced down into the balls, pushing the seal and spacer out the side.
EB engineer is offline   Reply With Quote
Old 2009-02-07, 09:59 AM   #62
munirocks
GUnirocks
 
munirocks's Avatar
 
Join Date: Feb 2008
Location: Freiburg, Germany
Posts: 1,872
Quote:
Originally Posted by EB engineer View Post
does anyone know what brand of bearings he uses. it seems to me like low quality bearings are the major issue here. the bearings were probably not designed to have downward force applied to them. most bearings of that type are meant for rotational forces only. the bearings outer shell may be being forced down into the balls, pushing the seal and spacer out the side.
I don't know what kind of bearings they are, but Florian said he has always been using exactly the same kind for all of his hubs. So maybe these particular ones happen to have some material defects. Because most of the hubs seem to work fine.
__________________
µ-knee

Last edited by munirocks; 2009-02-07 at 09:59 AM.
munirocks is offline   Reply With Quote
Old 2009-02-07, 10:07 AM   #63
monocyclism
Unicyclist
 
monocyclism's Avatar
 
Join Date: Dec 2008
Location: France
Posts: 858
Quote:
Originally Posted by tholub View Post
...... You have to be prepared for the hub to be a ...... lot more prone to failure than other unicycle hubs.
Yeah...in this case, less than a week and £850.00 of preparedness...

http://www.unicycle.uk.com/Shop/shop...asp?Search=Yes

Ouch! Commiserations capuni
monocyclism is offline   Reply With Quote
Old 2009-02-11, 09:52 AM   #64
munirocks
GUnirocks
 
munirocks's Avatar
 
Join Date: Feb 2008
Location: Freiburg, Germany
Posts: 1,872
So am I the first one actually sending the hub back to Switzerland? I'm going to send it today. It'll cost me an arm and a leg, and I'll have to find a box to fit around my 26" wheel... And then I'm not sure about insuring it and customs etc. Anyways, I hope it will all go well. Florian said he was going to pay me back for shipping costs.
__________________
µ-knee
munirocks is offline   Reply With Quote
Old 2009-02-17, 09:26 PM   #65
monocyclism
Unicyclist
 
monocyclism's Avatar
 
Join Date: Dec 2008
Location: France
Posts: 858
Wow! The ultimate 10 speed GUni

Well, if two speeds is not enough how about this :

http://oldtenspeedgallery.com/for-sa...peed-unicycle/

Anyone own up to this ingenious device?

Last edited by monocyclism; 2009-02-17 at 09:28 PM.
monocyclism is offline   Reply With Quote
Old 2009-02-17, 10:02 PM   #66
Jeremy R
onceuponatimetherewasaper son
 
Jeremy R's Avatar
 
Join Date: Oct 2008
Location: Massachussets
Posts: 1,998
Send a message via AIM to Jeremy R
A technological development in sterilization techniques!
__________________
661
MountainUni
or make it a dinglespeed - saskatchewanian
Jeremy R is offline   Reply With Quote
Old 2009-04-04, 09:42 AM   #67
munirocks
GUnirocks
 
munirocks's Avatar
 
Join Date: Feb 2008
Location: Freiburg, Germany
Posts: 1,872
Hey, I finally got my wheel back on the 1. of April. The bearings have been replaced and seem to stay where they're supposed to be. So much for the good news.

The bad news is, yesterday I upded badly when speeding along in high gear downhill. What happened was that the left crank had apparently come loose. But without any signs beforehand. So of course I landed on my backside with a strong impact, resulting in some annoying but not serious injuries on my elbows and bum. I guess my backpack saved my back from getting hurt. The car behind me was able to stop in time, so it didn't hit me either. So I got up slowly and kind of wondered how severe my injuries were.

I then took the shifting button off in order to be able to take the crank off for closer inspection. Then I saw that the crank had bent the rod where the button mounts to very badly. No way to fix that without getting that rod replaced. Damn, this really sucks. And how could the crank come loose so easily and quickly? I installed it with locktight blue and torked it up very strongly with a simple hex wrench. The cranks don't ever loosen on the moment hubs when I install them that way, so what's wrong here? I wonder if the newer longer axles would be an improvement that can allow a better connection between cranks and axle. In that case I would think I should get one of those as a replacement, shouldn't I?

The thing about cranks coming loose on a geared hub versus an ungeared one is, that it might be hard to distinguish between the usual play in the hub and a loose crank, especially when cruising along on a slight downhill, where you don't put a lot of pressure on the cranks.

Damn, this is pretty dangerous stuff if it doesn't stay connected. How am I supposed to trust this hub again? Has anybody else experienced this?
__________________
µ-knee

Last edited by munirocks; 2009-04-04 at 09:50 AM.
munirocks is offline   Reply With Quote
Old 2009-04-04, 12:44 PM   #68
siafirede
Flex Your Head
 
siafirede's Avatar
 
Join Date: Apr 2004
Location: Melbourne, Australia
Age: 35
Posts: 2,291
Quote:
Originally Posted by munirocks View Post
Hey, I finally got my wheel back on the 1. of April. The bearings have been replaced and seem to stay where they're supposed to be. So much for the good news.

The bad news is, yesterday I upded badly when speeding along in high gear downhill. What happened was that the left crank had apparently come loose. But without any signs beforehand. So of course I landed on my backside with a strong impact, resulting in some annoying but not serious injuries on my elbows and bum. I guess my backpack saved my back from getting hurt. The car behind me was able to stop in time, so it didn't hit me either. So I got up slowly and kind of wondered how severe my injuries were.

I then took the shifting button off in order to be able to take the crank off for closer inspection. Then I saw that the crank had bent the rod where the button mounts to very badly. No way to fix that without getting that rod replaced. Damn, this really sucks. And how could the crank come loose so easily and quickly? I installed it with locktight blue and torked it up very strongly with a simple hex wrench. The cranks don't ever loosen on the moment hubs when I install them that way, so what's wrong here? I wonder if the newer longer axles would be an improvement that can allow a better connection between cranks and axle. In that case I would think I should get one of those as a replacement, shouldn't I?

The thing about cranks coming loose on a geared hub versus an ungeared one is, that it might be hard to distinguish between the usual play in the hub and a loose crank, especially when cruising along on a slight downhill, where you don't put a lot of pressure on the cranks.

Damn, this is pretty dangerous stuff if it doesn't stay connected. How am I supposed to trust this hub again? Has anybody else experienced this?
Wow yeah that is some bad news, but it sounded like you were really excited to get your hub back and jumped into riding without taking the necessary precautions.

1) You shouldn't tighten the bolts with a simple hex wrench...that can't provide enough torque.

2) Even with a torque wrench it will take a few rides for the cranks to go in place. When I put new cranks on my kh/schlumpf, I always leave the buttons off and ride it in high gear for a short amount of time, tighten, ride a mile, tighten, ride a few miles, tighten...until I am sure the cranks are in place, and then I put the buttons on.

Either way, that is a shame that you will have to ship the hub back again. It is worth it, I can't imagine riding ungeared.
__________________
-James
siafirede is offline   Reply With Quote
Old 2009-04-04, 12:52 PM   #69
munirocks
GUnirocks
 
munirocks's Avatar
 
Join Date: Feb 2008
Location: Freiburg, Germany
Posts: 1,872
What I don't understand is, that the regular moment hub doesn't have these issues with KH cranks, so isn't this a major flaw that should be eliminated with yet another change in the design? I mean, this really must not happen, people could be hurt very badly like this. And who is going to pay for them if they can no longer do their jobs? Like playing their instrument in my case. I think this is clearly something that needs to be improved very quickly. I mean, how am I supposed to trust this same hub again? As I said, there was not the slightest sign of loosening of the crank.
__________________
µ-knee

Last edited by munirocks; 2009-04-04 at 12:53 PM.
munirocks is offline   Reply With Quote
Old 2009-04-04, 12:59 PM   #70
Dosestrallas12
Mono de España
 
Dosestrallas12's Avatar
 
Join Date: May 2007
Location: Battle Creek, Michigan
Age: 26
Posts: 20
Send a message via MSN to Dosestrallas12
this is strange, such good hub should not have problem. costs thousands to buy but still problem. maybe kris must do more careful prototype in future for longer.

if K1 does this hub at same price and quality i think everyone will HATE on koxx and blame but just because is KH does not mean bad product is OK...

just my thought
Dosestrallas12 is offline   Reply With Quote
Old 2009-04-04, 05:30 PM   #71
Probailer2
Say no to drugs!
 
Probailer2's Avatar
 
Join Date: Oct 2005
Location: Belgium
Age: 30
Posts: 2,028
Quote:
Originally Posted by Dosestrallas12 View Post
if K1 does this hub at same price and quality i think everyone will HATE on koxx and blame but just because is KH does not mean bad product is OK...

just my thought
Thats is so true
__________________
Sponsored by www.municycle.com
Quote:
Originally Posted by JJuggle
If somebody cloned your mother would you have sex with the clone? I should think not.
Quote:
Originally Posted by Danni
I don't like having penis written all over my uni .
Quote:
Originally Posted by manon1wheel
no offense but deads look plain old gross...
Probailer2 is offline   Reply With Quote
Old 2009-04-04, 07:27 PM   #72
ellsworth23
Unicyclist
 
Join Date: Apr 2007
Location: Bend, OR
Age: 65
Posts: 41
The thing about cranks coming loose on a geared hub versus an ungeared one is, that it might be hard to distinguish between the usual play in the hub and a loose crank, especially when cruising along on a slight downhill, where you don't put a lot of pressure on the cranks.

Damn, this is pretty dangerous stuff if it doesn't stay connected. How am I supposed to trust this hub again? Has anybody else experienced this?[/QUOTE]
ellsworth23 is offline   Reply With Quote
Old 2009-04-04, 07:30 PM   #73
ellsworth23
Unicyclist
 
Join Date: Apr 2007
Location: Bend, OR
Age: 65
Posts: 41
Quote:
Originally Posted by ellsworth23 View Post
The thing about cranks coming loose on a geared hub versus an ungeared one is, that it might be hard to distinguish between the usual play in the hub and a loose crank, especially when cruising along on a slight downhill, where you don't put a lot of pressure on the cranks.

Damn, this is pretty dangerous stuff if it doesn't stay connected. How am I supposed to trust this hub again? Has anybody else experienced this?
[/QUOTE]

OOPs - I replied with the quote only the first time. I don't have a schlumph hub (but would like to get one). Concerning cranks coming loose though I think you should always be careful to watch crank tightness. I've seen them come loose on nearly every type of vehicle that has cranks and one time or another. You just have to pay attention to them as a regular maintenance routine. Regular checks after first mounting them is important.
ellsworth23 is offline   Reply With Quote
Old 2009-04-05, 03:33 AM   #74
corbin
Treehouse Muni Rider
 
corbin's Avatar
 
Join Date: Aug 2004
Location: Los Gatos, CA
Age: 41
Posts: 1,378
Send a message via AIM to corbin
Hey munirocks,
That's a total bummer! siafirede (James) covered the basics -- it seems that everyone with the KH hub has had the cranks come loose. I constantly had a problem with the right crank getting loose -- I would look down and see how far in the button was looking -- when it looked a little further "in" and was harder to shift when the crank was coming loose.

You definitely have to use a torque wrench on it; I don't torque it as high as florian says to, since it tends to deform the alumn cranks and force them too close to the frame (NOTE: that should be fixed on the latest generation with the longer ISIS hubs).

As James said, geared unicycling is the way to go. It is no longer the future of unicycling; it has come to the present.

I rode my KH36 guni about 22 miles today; a good amount of up/downhill in 2 hours. Louise and I did the same ride last weekend on the guni 24s in 2 hours 30 mins. Not too much of a time difference, but I definitely preferred the geared 36 for the road ride.

corbin
__________________
http://www.corbinstreehouse.com
maestro8 fan club
Justin LE fan club
corbin is offline   Reply With Quote
Old 2009-04-05, 08:50 AM   #75
munirocks
GUnirocks
 
munirocks's Avatar
 
Join Date: Feb 2008
Location: Freiburg, Germany
Posts: 1,872
Thanks for your input, guys. Maybe the initial tightening wasn't quite enough then. But I really tightened it as much as I could with my wrench. A normal crank and hub combo wouldn't have had a chance to come loose. Somebody explained to me yesterday, that one has to degrease the ISIS threads meticulously before applying the locktight. Kind of a hard thing to do on the Schlumpf, so maybe I didn't clean it enough...

What was really weird about this incident was that it didn't seem to loosen gradually, so there would have been a chance to notice and tighten it again. But it just went from tight to loose in a split second... No chance to stop and fix it.

I would like to agree to geared unicycling being the present now. But my bad experiences make me doubtful about it... It seems to involve much greater risks than I thought it did. If something on that hub fails at high speeds or in serious mountains, it could end very badly, it seems.
__________________
µ-knee
munirocks is offline   Reply With Quote
Reply

Tags
bist, brand, broken, mumpitz, renate, schlumpf


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Broken Schlumpf Crank semach.the.monkey General Unicycling Discussions 28 2009-02-19 09:27 PM
Broken KH/Schlumpf hub corbin General Unicycling Discussions 45 2008-07-17 04:05 PM
New Schlumpf setup Brian MacKenzie General Unicycling Discussions 20 2007-03-19 03:03 AM
My new Schlumpf Tigger General Unicycling Discussions 12 2007-02-20 09:00 PM


All times are GMT. The time now is 12:45 AM.


Powered by vBulletin®
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright © 2001-2019 Gilby
You Rated this Thread:
Page generated in 0.09146 seconds with 12 queries