Unicyclist Community

Go Back   Unicyclist Community > Unicycling Discussion > General Unicycling Discussions

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 2017-04-30, 06:44 PM   #1
Cyclophobia
Registered User
 
Join Date: May 2015
Posts: 1
Sudden Catastrophic Rim Failure on a Kris Holm 24

While riding my stock Kris Holm 24” at the Milwaukee Unicyclists meet in Red Arrow Park this week, the edge of the rim spontaneously separated. I initially thought that the tire bead had snapped or that the fork had failed since there was a loud “SPROING” sound and a sharp piece of metal was poking into the inside of my calf. Upon looking closer I could see that the side of Kris Holm rim had almost entirely separated from the unicycle. I am still a novice level rider and have never taken any vertical drops with it. The tire was always filled to the maximum recommended pressure and I had been riding for about 20 minutes on flat concrete beforehand.

Has anyone ever seen something like this before or know what caused it? Also, should I buy another Kris Holm rim or is there a stronger rim I should try? Unicycle.com is currently out of stock on the Kris Holm 24 inch rim. I have attached a picture of the failed rim below.
Attached Images
 
Cyclophobia is offline   Reply With Quote
Old 2017-04-30, 09:46 PM   #2
Eddbmxdude
THE original 12" Trials vid
 
Eddbmxdude's Avatar
 
Join Date: Jan 2006
Location: Luton, UK
Age: 31
Posts: 2,235
That's a pretty old rim. It's actually a bike rim and if you look closely at the section which is still intact you'll see a brake wear indicator line. These rims always used to 'peel' like this. I've had it happen several times to me, although it was always when gapping stairs or something.
__________________
www.stfulondon.co.uk

I guess it's just a good thing you didn't include the footage of us snorting cocaine from the thighs of prostitutes eh Edd. - Boogie
Eddbmxdude is offline   Reply With Quote
Old 2017-05-01, 02:14 AM   #3
AJ KJ
Unicyclist
 
Join Date: Sep 2016
Location: North Bend, WA
Age: 16
Posts: 66
Quote:
Originally Posted by Cyclophobia View Post
While riding my stock Kris Holm 24” at the Milwaukee Unicyclists meet in Red Arrow Park this week, the edge of the rim spontaneously separated. I initially thought that the tire bead had snapped or that the fork had failed since there was a loud “SPROING” sound and a sharp piece of metal was poking into the inside of my calf. Upon looking closer I could see that the side of Kris Holm rim had almost entirely separated from the unicycle. I am still a novice level rider and have never taken any vertical drops with it. The tire was always filled to the maximum recommended pressure and I had been riding for about 20 minutes on flat concrete beforehand.

Has anyone ever seen something like this before or know what caused it? Also, should I buy another Kris Holm rim or is there a stronger rim I should try? Unicycle.com is currently out of stock on the Kris Holm 24 inch rim. I have attached a picture of the failed rim below.
That's really unusual, the current Kris Holm rim is strong, so you could get that as a replacement, but the Nimbus Dominator2 is basically bombproof. Maybe someone on here has managed to break one, but I don't think I've heard of one breaking. I'm sure someone, somewhere, has managed to, but I haven't heard of it (I also haven't been actively looking through broken parts threads).
__________________
Learn something new every day -
It's just that I needed what I learned today, yesterday.
AJ KJ is offline   Reply With Quote
Old 2017-05-01, 03:46 PM   #4
Mikefule
Bridge of Otherwhere: on Kindle
 
Mikefule's Avatar
 
Join Date: May 2002
Location: Long Bennington, Lincolnshire, England.
Posts: 7,143
That looks like the same model as I have. I don't do big drops or much hopping but I have ridden it over many miles of rough terrain, tree roots, ruts and rocks, and I have never had that happen.
__________________
My first novel, Bridge of Otherwhere, Michael Wilkinson, on Kindle. A tale of subtle magic, mystery, friendship and love. Tinyurl.com/Bridge-of-Otherwhere For US$ page: TinyURL.com/OtherwhereBridge
Mikefule is offline   Reply With Quote
Old 2017-05-01, 03:52 PM   #5
bouin-bouin
Didier
 
bouin-bouin's Avatar
 
Join Date: May 2008
Location: France in Europe (Le Chesnay - Yvelines)
Age: 52
Posts: 779
Quote:
Originally Posted by AJ KJ View Post
That's really unusual, the current Kris Holm rim is strong, so you could get that as a replacement, but the Nimbus Dominator2 is basically bombproof. Maybe someone on here has managed to break one, but I don't think I've heard of one breaking. I'm sure someone, somewhere, has managed to, but I haven't heard of it (I also haven't been actively looking through broken parts threads).
No, that's usual on the old KH rim (KH2005 model), a friend of mine got the same issue but less impressive than yours !
__________________
http://monocycle.info
http://www.leblogdumonocycle.fr/
CITY XTP 26", MUNI KH26" & KH29", ROAD Oracle 32" and KH36"
my goal : a 3 geared 29" to have only one uni for all kind of rides :-)

Last edited by bouin-bouin; 2017-05-01 at 03:53 PM.
bouin-bouin is offline   Reply With Quote
Old 2017-05-01, 05:14 PM   #6
tholub
Totally Doable
 
tholub's Avatar
 
Join Date: Apr 2002
Location: Berkeley, CA
Age: 50
Posts: 3,672
Quote:
Originally Posted by Cyclophobia View Post
While riding my stock Kris Holm 24” at the Milwaukee Unicyclists meet in Red Arrow Park this week, the edge of the rim spontaneously separated. I initially thought that the tire bead had snapped or that the fork had failed since there was a loud “SPROING” sound and a sharp piece of metal was poking into the inside of my calf. Upon looking closer I could see that the side of Kris Holm rim had almost entirely separated from the unicycle. I am still a novice level rider and have never taken any vertical drops with it. The tire was always filled to the maximum recommended pressure and I had been riding for about 20 minutes on flat concrete beforehand.

Has anyone ever seen something like this before or know what caused it? Also, should I buy another Kris Holm rim or is there a stronger rim I should try? Unicycle.com is currently out of stock on the Kris Holm 24 inch rim. I have attached a picture of the failed rim below.
Very impressive! It looks like this was the rim model that had a score down the middle of it, which turned out to be a bad idea, though I've not seen quite as spectacular a failure as this.
tholub is offline   Reply With Quote
Old 2017-05-02, 10:21 PM   #7
saskatchewanian
ERIC P
 
saskatchewanian's Avatar
 
Join Date: Jan 2007
Location: La Ronge, Saskatchewan, Canada
Age: 32
Posts: 6,432
As others have stated that's a known problem with that particular rim, but I don't think we have seen any that seperated quite that much before.
__________________
My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we’ll change the world. - Jack Layton
saskatchewanian is offline   Reply With Quote
Reply

Tags
catastrophic, failure, holm, kris, rim, sudden


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
Nimbus Oracle 24" or Kris Holm 24" MUni? UnicycleSam123 General Unicycling Discussions 26 2015-03-18 05:10 AM
[For Sale: USA] Kris Holm 24" Mountain Unicycle KH 24 (Seattle area) Jay D Trading Post 3 2014-02-19 06:41 PM
Kris Holm 19" rim... Sponge General Unicycling Discussions 0 2012-04-21 09:13 AM
[For Sale: USA] Kris Holm KH36 / Stealth rim wheel adelman Trading Post 0 2011-10-25 04:30 AM


All times are GMT. The time now is 03:43 AM.


Powered by vBulletin®
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright © 2001-2016 Gilby
Page generated in 0.30667 seconds with 13 queries