i have a 36" from unicycle.com (the bigone). a good tire, it’ s a very good
uni, it goes very fast. I thinkj 42" or more will be very uncomfortable, and
it’ s stupid because we use this sort of uni to make a lot of road.
Those are very nice looking big wheel unicycles. They look to be very well made.
What do you plan on using the big wheel unicycle for? Parades? Long distance rides? General riding around?
The general consensus is that big wheels with solid tires are not comfortable for long rides and because of the rough ride and difficult handling they are not as fast as smaller pneumatic (air filled) tires like the Coker. The big wheel would be great for parades and just having fun, but for long distance rides a Coker would be better.
You’re only in Central Europe. It’s not like you’re across the ocean. I don’t think shipping costs should be too bad from the UK to Hungary, but shipping a Coker can be expensive due to its size. Contact unicycle.uk.com to find out what shipping would be.
Getting the Coker tire and tube and then building the rest of the unicycle would be a lot of work. You would need to get a custom rim made, get custom spokes cut, and build a custom frame. Getting a good rim made that is wide enough and big enough for the Coker tire would be the difficult part and the expensive part. I have a hard time believing that building it yourself would be less expensive than the extra shipping.