WARNING 07 KH ISIS crank removal

Warning to all with the new 07 KH ISIS cranks
If you change your crank arms and use this tool http://www.unicycle.com/shopping/shopexd.asp?id=421
the tool comes with 2 buttons that fit in the end that makes contact with the hub when pulling crank, “DO NOT USE THE SMALL BUTTON” I made this mistake tonight and the button was pushed into the threads on the hub as I tightened the puller and damaged the threads. Now I am trying to find out what size thread tapper I need to correct the threads so I can put it back together.

That’s terrible, sorry to hear.

I did the same thing with my 07 with a different crank puller, can’t remember which size thread tapper I used to fix it though sorry.

damn that sucks… sorry to hear it mate. nice to warn us though i’ll be extra carefull with koxx not-isis cranks

You should be carefully watch the puller tool at all ISIS Systems. The QU-AX ISIS is also a bit tricky to pull of. Sorry to Daytripper that this shit happens to him.

KOXX-1 NOT ISIS are fine because the smaller button on my crank extractor is just small enough to fit inside the shaft and then the threads of my extractor ended up the same size as the shaft itself. I was a little baffled when I got all the way to the end of the extractor but my cranks didn’t budge. No damage was a good thing for sure.

We use a home-made crank puller for all of our crank-pulling needs. For hubs that have tapped hole through the middle, we stick in a threadless bolt so that the puller can push on something solid. Always check to make sure that things are where they need to be before you start applying a lot of force.

The ISIS spec allows for the use of either M12 or M15 cranks bolts. Koxx and KH both use M12 crank bolts that have a 1.0mm pitch. So you need a 12mm x 1.0mm pitch tap.

Truvativ sells a M12 self extracting CroMo crank bolt set that I used to convert my Koxx cranks to a self extracting setup. I got this idea from using a set of Truvativ ISIS cranks on my Koxx hub (see my avatar). These should fit the KH cranks to make them self extracting.

So Truvativ cranks fit the koxx hub? My god, will this Isis or not Isis ever stop?

Hah the same thing happened to me. I kept on turning it and I was like, why the hell is my crank not coming off. Then I tried to pull the crank puller off and found that it was screwed in, man did I ever feel dumb :P.

From what I have read some Koxx hubs are within the ISIS spec and some are not. I guess I got lucky to have one that was within the ISIS spec. I have also read that a hub and set of cranks can both meet the ISIS spec but if the hub is on one end of the spec range and the cranks are on the other, they may not fit together.

So it may be that Koxx and Truvativ are just on one end of the spec and KH is on the other.

I highly doubt there were some hubs that are isis and some that arn’t, I bet there were some people that own the koxx hub that are dumasses, and some that arn’t. Resulting it different reports on its being isis or not isis. Truvativ is a pretty common Isis crank in the bike world, If that fits…Hmm…I’d say most would. Someone needs to go to a bike shop that carrys tons of isis cranks and see which fit and which dont.

I did try to mount the Truvativ cranks on my Koxx Red Devil just to see if they would fit. The Truvativ cranks fit but they would not tighten up against the spacer. There was a 1/4" gap between the spacer and the crank (there is no gap when I mount the Truvativ cranks on my muni). So it looks like the hub on my Red Devil is a little bit bigger than the one on my muni.

I think it was one of Roland’s post on the German forum that talked about the variances in the Koxx hub.

But the splines sink into the crank properly right? I suspect Yoggi will fix the slight variation in the 07 koxx hubs after reading all these koxx no isis threads.

Yes, the splines fit correctly. My guess is that the hub on my Red Devil has a flute taper (the milled out portion) which is too steep so it does not allow the crank to slide completely onto the hub. My Koxx cranks fit fine with no gap. It would be interesting to know if this is defined as an incompatible ISIS hub.

I wish Yoggi would give us a detailed explanation about the Koxx ISIS problem and if it will be addressed in future Koxx hubs/cranks. This would help keep down the number of “incompatible Koxx ISIS” threads.

im thinking about buying a kh isis cranks and hub
you guys know if it fit in the nimbus frame ?

Nimbus II frame?

I am not sure about the regular, rounded Nimbus frame, but if I remember right, you ordered the Nimbus Hoppley, and that comes with the Nimbus II frame, so I hope your using that one. lol

Anyways, because the Nimbus II frames bearing holders arent machined and perfect like on a kH frame, they will hold the 42mm bearings from KH. =p

The KH ISIS hub has 42mm bearings and I think most nimbus frames take 40mm bearings. The KH ISIS hub does not have the option of installing the Torker DX 40mm bearings to make it fit in 40mm bearing housing frames.

If you search the forum you will find two answers:

“Yes you can with no problems, I have done it for years.”


“No, it will cause your bearings to fail.”

I have not run a 42mm bearing in a 40mm bearing housing frame for more than a few hours. So I can say
yes it will fit but I am not sure about the long term durability of the bearings.

If you do order a KH ISIS hub and cranks and plan to put them in a nimbus frame, I would order a spare set of bearings because the KH ISIS bearings (made by Qu-ax) are 42mm x 24mm and are not a standard bearing size.


Thanks for the tap size info