150/130/110 Triple Hole Cranks

[tholub]

Originally Posted by Nurse Ben

What I'd really like to see is a true ISIS standard with a steep taper or a physical stop on the spindle, this would put the cranks in the same location every time with no creep issues.

The ISIS standard doesn't have a steep taper (1 degree vs. 2 degrees for square taper). But it does have a crank stop. To use a real crank stop on unicycles, we'd have to make our bearings larger to get over it. There's a stock 25mm ID/47mm OD which would probably work, but would definitely require a different bearing holder.

[Nurse Ben]

The ISIS standard doesn't have a steep taper (1 degree vs. 2 degrees for square taper). But it does have a crank stop. To use a real crank stop on unicycles, we'd have to make our bearings larger to get over it. There's a stock 25mm ID/47mm OD which would probably work, but would definitely require a different bearing holder.

Hmm, I thought there was also a difference in the taper, which is why the creep is an issue on unis more so that bikes.

A stop would work if the spindle were larger or the splines were smaller, but now we're talking about a new standard...

At one point I was think of a two part split ring that was cone shaped, so the crank would press the halves of the cone together to make a stop.

The spacers do work and serve a purpose in keeping the bearing from slipping on the spindle, but the fit is rarely perfect and in time the cranks loosen, so then you can reduce the spacer thickness if you have not already maxed out the tolerance; a common problem with Schlumpfs and KH frames.

I'd like to see the cranks incorporate a cross wise clamp bolt, like a bmx jump bike, then you could set the crank size where you need them and tighten the crank without having to move it closer to the hub.

[tholub]

Originally Posted by Nurse Ben

Hmm, I thought there was also a difference in the taper, which is why the creep is an issue on unis more so that bikes.

No, it's because the ISIS standard is that the bulk of the force is the pressure of the crank against the crank stop, not against the splines, and we don't have a crank stop. The explicit purpose of the crank stop is to put the crank in the same place every time you install it.

[bouin-bouin]

make your choice :

[Julia B]

Originally Posted by Nurse Ben

Do you know what the pins are made of, i.e 6000 or 7000 Aluminum?

I'm not sure, you could contact Marco though, he'll definitely know.

Here's another photo where you can see the back of the triple hole cranks. Like vookash said they'll be offered in a 10 pin ISIS version.

[MadFurai]

Julia, is that your personal inventory? lol

Awesome looking cranks...

[Julia B]

Originally Posted by MadFurai

Julia, is that your personal inventory? lol

Awesome looking cranks...

I wish. Most of the pictures are Marco's from facebook.

[knoxuni]

I still really want a mad4one cranks like crazy!

[Julia B]

Just an update. WARNING: there's no hard data in this post. Beware.

A couple people have bought/gotten the colored 6 pin wheels now, and they feel amazing! I'm pretty jealous actually, my unicycle feels really heavy now. Krisz just landed the world's first secret side (you'll have to wait for the clip, it's a secret ) on the day he got his. When I get home I'll try to find out and post the exact weights, but you won't be disappointed!

[ShafferJN]

Marco is cool. His unicycle wisdom in the relm of hubs and cranks makes me happy.

[Julia B]

Originally Posted by ShafferJN

Marco is cool. His unicycle wisdom in the relm of hubs and cranks makes me happy.

I know! He's so nice, he gave me some white madapters yesterday. My unicycle is so color coordinated now. When I get home I'll post some pictures.

Also, I've heard whispers that mad4one may begin producing a wider range of components.

[ShafferJN]

Tiiiight! I look forward to seeing what he comes up with!

[Baca]

Quick question to the actual thread, is there a big feeling difference between 150mm and 165mm cranks? Is this lenght annoying out of terrain - especially roads etc.? I'm doing XC most of the time. Dealer has Nimbus Muni 26" only with 165s and no another stock black 150s (I'd have to wait weeks) so if I should buy it anyway... Thanx

[tholub]

Originally Posted by Baca

Quick question to the actual thread, is there a big feeling difference between 150mm and 165mm cranks? Is this lenght annoying out of terrain - especially roads etc.? I'm doing XC most of the time. Dealer has Nimbus Muni 26" only with 165s and no another stock black 150s (I'd have to wait weeks) so if I should buy it anyway... Thanx

165s feel slow if you're not doing stuff that's really technical. They feel really slow on roads. If you can't afford two sets of cranks, I'd wait.