older KH trials cranks stripped! need help!

philbeckerSD · 2012-04-18, 10:02 PM

I have had my KH trials unicycle for a number of years and have wound up with stripped cranks. When looking around trying to find new cranks all I could find were the new ISIS ones, and from what I have read I am unable to use these on an older model. Is there any hope or am I really going to have to buy a whole new unicycle because of a pair of stripped cranks?!?! This is really putting a damper on my riding time! Thanks for the help!

Phil B.

philbeckerSD · 2012-04-19, 02:47 PM

Any ideas?

knoxuni · 2012-04-19, 03:02 PM

Have you taken them to a LBS and get them retapped

Smilymarco · 2012-04-19, 03:10 PM

If i remember right, you can just turn the whole crank around... the thread should go all way through and you can insert the pedal on the other side.

nickjb · 2012-04-19, 03:32 PM

Mine have got a bit of Q factor so you can't trurn them.

Might be worth a phone call to UDC they might have some in box somewhere even if they aren't on the website. You could try a wanted ad, someone might have some spares (I do, but I've got 2 KH splined hubbed unis so I'm holding on to them

). Even if you find some it might be cheaper to buy a new ISIS hub and rebuild the wheel.

tholub · 2012-04-19, 04:08 PM

I think Darren Bedford still has some of the old-style in stock.

philbeckerSD · 2012-04-19, 04:29 PM

I see that he has some. What type would I need or would work? ONZA, Moment, Sym?

tholub · 2012-04-19, 04:51 PM

Quote:

Originally Posted by philbeckerSD

I see that he has some. What type would I need or would work? ONZA, Moment, Sym?

If your hub is not ISIS it's probably Onza (36-spline). If so, it probably says Onza or KH/Onza on it.

Harley · 2012-04-19, 05:55 PM

Quote:

Originally Posted by tholub

If your hub is not ISIS it's probably Onza (36-spline). If so, it probably says Onza or KH/Onza on it.

Or is it old enough to still have the 8 spline cranks & arms?

corbin · 2012-04-19, 06:21 PM

Other alternative: You can have a bike shop drill out the pedal hole, and they can re-tap it and stick a new insert in.

corbin

JacobSpera · 2012-04-19, 09:27 PM

I would suggest looking for a new pair of cranks. Getting a pair of unicycle cranks tapped isnt such a good idea. The inserts are pretty soft and for bikes they work just fine as long as you are doing "easy" riding. I had a pair of cranks re-threaded and broke them the next day.

I can also imagine that the cost of the repair would only be slightly less than a pair of cranks.

goodluck

jtrops · 2012-04-19, 09:36 PM

If these are CrMo cranks you may be able to have the threads rebuilt with welding rod, re-drilling and tapping.

A more gentle repair could be some hard silver solder over the threads in the crank, and just to retap without the drilling. If you pair this up with a new pair of pedals with longer threads you may be into a workable fix. The threads on the steel cranks are pretty deep, so if it's tapped from the back side the new threads will align perfectly with the old ones, and hopefully the new pedals will be in the original threads a bit.

corbin · 2012-04-19, 11:01 PM

Quote:

Originally Posted by JacobSpera

I would suggest looking for a new pair of cranks. Getting a pair of unicycle cranks tapped isnt such a good idea. The inserts are pretty soft and for bikes they work just fine as long as you are doing "easy" riding. I had a pair of cranks re-threaded and broke them the next day.

I can also imagine that the cost of the repair would only be slightly less than a pair of cranks.

goodluck

That's not true; the place that did it for you probably did it wrong! The inserts should be just as strong (or nearly so).

Actually, if you look at the KH alumn cranks, they all have inserts standard.

corbin

Carey · 2012-04-19, 11:46 PM

I am with Tholub...you probably want the Onza cranks. I have two unicycles (24 and 29) from that era and a set of pedal cranks in each size (125, 140, 150, and 165) to allow me the greatest flexibility. I like that generation because of the significant Q factor. If you like the way your unicycle operates now, it is worth the effort to find a set. They are around, I bought my 140s a couple of years ago after looking around a bit.

JacobSpera · 2012-04-19, 11:49 PM

Quote:

Originally Posted by corbin

That's not true; the place that did it for you probably did it wrong! The inserts should be just as strong (or nearly so).

Actually, if you look at the KH alumn cranks, they all have inserts standard.

corbin

The place that threaded my cranks make there penny fartherings 100% from raw materilas. Pretty sure the guy did it right.

Also in KH cranks they have an entire two piece chromoly insert. Unless you have a bike shop that has these i highly doubt that is what you will get. Yes the KH thread inserts are the best there is. They also pretty expensive.

If you did take the cranks to a bike this is prolly what they will repair your cranks with

http://ecx.images-amazon.com/images/...500_AA300_.jpg

I have also re-threaded a pair of cranks for my friend. I can tell you from first hand experience that these things really arent that strong.

2012-04-18, 10:02 PM	#1
philbeckerSD Registered User Join Date: Apr 2011 Posts: 6	older KH trials cranks stripped! need help! I have had my KH trials unicycle for a number of years and have wound up with stripped cranks. When looking around trying to find new cranks all I could find were the new ISIS ones, and from what I have read I am unable to use these on an older model. Is there any hope or am I really going to have to buy a whole new unicycle because of a pair of stripped cranks?!?! This is really putting a damper on my riding time! Thanks for the help! Phil B.

2012-04-19, 03:02 PM	#3
knoxuni wes style!! Join Date: Jun 2010 Location: central ohio Age: 18 Posts: 4,668	Have you taken them to a LBS and get them retapped __________________ Be a dumbass experience dumbass consequences its full circle of dumbass And then, do it again. That makes it an infinite loop!

2012-04-19, 03:10 PM	#4
Smilymarco just call me similymarco Join Date: Jun 2003 Location: Mörlach, Bavaria, Germany Age: 25 Posts: 3,365	If i remember right, you can just turn the whole crank around... the thread should go all way through and you can insert the pedal on the other side. __________________ Riding for Triton Sponsored by HARTKOR FAKKER Supported by Municycle.com Protected by Better for your body

2012-04-19, 03:32 PM	#5
nickjb Too gnaaaar for a KH20 Join Date: Jul 2002 Location: Bristol (UK not CT) Posts: 512	Mine have got a bit of Q factor so you can't trurn them. Might be worth a phone call to UDC they might have some in box somewhere even if they aren't on the website. You could try a wanted ad, someone might have some spares (I do, but I've got 2 KH splined hubbed unis so I'm holding on to them ). Even if you find some it might be cheaper to buy a new ISIS hub and rebuild the wheel. __________________ Severn Wheelers. Bristol's best (and only) unicycle hockey club Wednesdays, 8:30. All welcome

2012-04-19, 06:21 PM	#10
corbin Treehouse Muni Rider Join Date: Aug 2004 Location: Los Gatos, CA Age: 35 Posts: 1,337	Other alternative: You can have a bike shop drill out the pedal hole, and they can re-tap it and stick a new insert in. corbin __________________ http://www.corbinstreehouse.com maestro8 fan club Justin LE fan club

2012-04-19, 02:47 PM	#2
philbeckerSD Registered User Join Date: Apr 2011 Posts: 6	Any ideas?

2012-04-19, 04:08 PM	#6
tholub Totally Doable Join Date: Apr 2002 Location: Berkeley, CA Age: 44 Posts: 3,244	I think Darren Bedford still has some of the old-style in stock.

2012-04-19, 04:29 PM	#7
philbeckerSD Registered User Join Date: Apr 2011 Posts: 6	I see that he has some. What type would I need or would work? ONZA, Moment, Sym?

2012-04-19, 09:27 PM	#11
JacobSpera Street Join Date: May 2010 Location: pueblo west colorado Age: 20 Posts: 915	I would suggest looking for a new pair of cranks. Getting a pair of unicycle cranks tapped isnt such a good idea. The inserts are pretty soft and for bikes they work just fine as long as you are doing "easy" riding. I had a pair of cranks re-threaded and broke them the next day. I can also imagine that the cost of the repair would only be slightly less than a pair of cranks. goodluck __________________ Team MAD4ONE

2012-04-19, 09:36 PM	#12
jtrops Registered User Join Date: May 2008 Location: Longmont, Colorado Age: 45 Posts: 1,286	If these are CrMo cranks you may be able to have the threads rebuilt with welding rod, re-drilling and tapping. A more gentle repair could be some hard silver solder over the threads in the crank, and just to retap without the drilling. If you pair this up with a new pair of pedals with longer threads you may be into a workable fix. The threads on the steel cranks are pretty deep, so if it's tapped from the back side the new threads will align perfectly with the old ones, and hopefully the new pedals will be in the original threads a bit. __________________ "A properly ridden unicycle is like an object in orbit: constantly falling but never landing." -Diogenes

2012-04-19, 11:46 PM	#14
Carey One up. Join Date: May 2005 Location: Colorado, USA Age: 62 Posts: 269	I am with Tholub...you probably want the Onza cranks. I have two unicycles (24 and 29) from that era and a set of pedal cranks in each size (125, 140, 150, and 165) to allow me the greatest flexibility. I like that generation because of the significant Q factor. If you like the way your unicycle operates now, it is worth the effort to find a set. They are around, I bought my 140s a couple of years ago after looking around a bit.

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