Can someone explain to me what the difference is between these two unicycles?
http://www.unicycle.com/shopping/shopexd.asp?id=795
http://www.unicycle.com/shopping/shopexd.asp?id=797
Scroll down to where it says features, if you have then. Then you will see that the 2 have some differences. Also the 1st one has the hardcore CrMo Muni-fork with footrests with brake bosses for magura brakes and fire stickers on frame
The fire stickers make it faster. 
The first one is much stronger specifically at the crank arms, seat post and rim.
Is one of the hubs any stronger than the other? They’re both ISIS, which would make the hubs equally strong eh? I’m a 210 lb guy so…
i think the first one is much stronger, the crossfire is not very heavily built
this is what i have gather from reading serveral other threads concerning this matter. i have the older qu-ax(non ISIS) and its bomb proof
A lot of people say that the yellow hub is stronger than the red hub but some say it’s the same strength. And just because the hub is ISIS doesn’t make it the same as all the other ISIS hubs.
What differentiates ISIS hubs, number of splines?
well the first one is more money so it must be better right?
The number of splines and the specific shape of the splines (ISIS hubs have a tapered spline interface which decreases the chances of creaking hub syndrome). Here is a link to an ISIS hub http://www.unicycle.co.nz/images/shop/KHMomentHub.jpg
Just like all 20" rims are not created equal, so too hubs are not created equal. An ISIS hub will be compatible with ISIS cranks but its strength will be determined by the quality of the raw materials used, the manufacturing process and the size hole used for the bolts that hold the cranks on.
There are actually two different sized bolts used on ISIS hubs, one for road ISIS hubs (which have a bigger hole) and one for mountain ISIS hubs (with a smaller hole). The red Qu-ax hub uses the bigger hole design which means it is more likely to break that a hub made of the same material with the smaller hole.
The red hub is still very strong though and I don’t know of anyone in NZ who has broken one. Kris broke a prototype KH/Schlumpf hub which used the bigger hole design after a serious amount of abuse, so they can be broken.
That is a joke right?
So then this: http://www.unicycle.com/shopping/shopexd.asp?id=584
Must be better than: http://www.unicycle.com/shopping/shopexd.asp?id=1050
Or that they are about equal when you upgrade the second one to KH moment cranks?
While sometimes price can give you an idea on quality - a lot of the time it means nothing more than how long its been since they last updated the web page.
The yellow-hubbed trials is many times stronger.
The hub is much much stronger, the rim is wider and better, the seatpost is lighter and stronger.
its a joke
Here is a link to a hub comparison chart
http://www.unicycle.uk.com/hubcomparator.html
All ISIS cranks have the same number of splines. Cranks and hubs are supposed to be interchangeable between brands, or at least that was the idea. Last I heard there is some confusion on this, and Koxx ISIS parts don’t always fit other makes. I think the other brands of ISIS parts can be swapped though.
The yellow hub uni is super strong.
The on the second everything on the uni but the frame and seat is weaker, the cranks much more so.
Even if it wasn’t a joke I’d forgive it, since he’s new and it’s often the case, esp. when by the same manufacture.
This is a bad example though.
http://www.unicycle.com/shopping/shopexd.asp?id=948http://www.unicycle.com/shopping/shopexd.asp?id=948
vs.
http://www.unicycle.co.uk/shop/shopdisplayproduct.asp?catalogid=1004 (260 ish USD)
-How could it be more expensive, I don’t get it? It’s almost as new and virtually all of the parts are cheaper. Similarly w/ what you posted.
The crossfire with the red hub is the exact same hub as the yellow hub one. The things that are better on the Yellow hub is the rim, seatpost, and cranks. The cranks make it stronger, the crossfire comes with freestyle cranks which makes it weaker, but if you upgrade the cranks its just as strong. And I dont know if the rims have different strengths? Its just the one is wider than the other. Some people perfer skinnier rims over wider rims.
So yeah like Brian O. said the cranks, seatpost, and cranks.
Isaac