ISIS crank stop sizing...

[Eddbmxdude]

I've never run spacers. I just tightened my tensiles up and left them. They seem fine, never worked loose on me. I didn't realise you had to, just thought they were for super anal people, lol. I always chuck 'em in the bin

[scott ttocs]

What size spacers do we need for different ISIS unicycles? UDC is now selling replacement spacers. I have a Nimbus 24" with Qu-Ax cranks where the bearing have slipped on occasion. It appears this problem could be avoided with spacers. So, do I need 4 mm, 6 mm or 8 mm spacers?


Here is an example:

http://www.unicycle.com/whats-up/alu...s-spacer.html/

Is there a chart online that list appropriate spacer sizes?

Scott

[rob.northcott]

Originally Posted by scott ttocs

What size spacers do we need for different ISIS unicycles? UDC is now selling replacement spacers. I have a Nimbus 24" with Qu-Ax cranks where the bearing have slipped on occasion. It appears this problem could be avoided with spacers. So, do I need 4 mm, 6 mm or 8 mm spacers?

I think the quick rule (on a UDC or KH hub) is 4mm for KH cranks, 6mm for others. But being really pedantic you'd have to take all sorts of things into account, including wear if the cranks have been fitted a few times. ISIS is a shallow taper and in my experience it doesn't really matter that much. I've got some Moments fitted with 6mm spacers and some Tensiles fitted with 4mm spacers - both "wrong" but neither has given any trouble.

My 36er has a Nimbus hub with Qu-Ax cranks, and is currently running one 4mm and one 6mm spacer - the hub came with odd ones and I can't be bothered to change it, works fine.

Rob

[Nurse Ben]

I posted this once, way back, about how I found that some cranks needed different spacers than others, depending on how they are machined. I think UDC uses 2-4mm (hub to bearing spacer) and 6-8mm spacers for cranks. I did find that the spacer provided with my KH and Nimbus hubs worked fine with the Moments, but when I got some K1 cranks I had to use a narrower spacer. I also had some fit problems with the Moments on the original KH Ti hub.

Having a variety of spacers on hand is a good for dong test fits. You don't want it to loose of the bearings will shift out board and of the frame/bearing will flex too much. You don't want it too tight or you'll fry your bearing or causing excessive spline wear (wobble).

I've never run spacers. I just tightened my tensiles up and left them. They seem fine, never worked loose on me. I didn't realise you had to, just thought they were for super anal people, lol. I always chuck 'em in the bin

You'll think twice about that after your bearing shifts on the axel and you have to walk home. Been there once, won't do it again!