The frame is finished but there are a few things wrong with it. I suppose I should’ve expected this given the bad luck I’ve had so far with this unicycle. Generally, I’m really happy with the way that the frame has turned out but the are a couple of little adjustments to be made and one seemingly big problem.
The big problem is that due to some sort of a misunderstanding, the legs are 72mm apart on the inside instead of being 82mm apart and fitting a 72mm tyre (the Gazz) with 5mm clearance on each side. I’m a little bit frustrated because I did write down that it should be 82mm and I’ve checked this on the copy I’ve got on my computer. I suppose I can’t get too annoyed until I find out what happened when I visit him later on today. He’s a really nice guy and he’s been very helpful with this project. He started work on the frame as soon as he could and finished it as quickly and neatly as possible. Has anyone got any suggestions about how I can fix this problem? I was thinking the I could crimp (is that the right word?) the legs a bit so they will just fit the tyre with only about 2mm clearance. Would I lose much strength by doing this? Even if I did do this, I’d be disappointed in having less clearance on the sides. Another thought I had was cutting the inside bit of the frame away a little bit and putting a plate or something on there to close it up again. I’m really not sure about this one. Would it work? I’d really appreciate any suggestions that any of you have.
The little problems are easily fixed. Firstly, the cut that he made in the top of the ‘neck’ that the seatpost fits into isn’t big enough. This will be easy and quick to fix. The other thing is that the bearing holders that the machinist made for me are a little bit too big for the bearings. They hold them in place but not as firmly as I’d like. I’ll just get Ian to shave these down to size a little bit. Once again, this be easy to do.
I also had a quick look at the range of colours that I could have on the frame if it’s done by the powder coated that Ian uses. There was an orange there but it didn’t seem bright enough. It’s hard to tell from the little sample and because the sample isn’t on metal. Could someone please tell me whether the actually paint job would turn out lighter or darker than the sample? I haven’t ordered any seat post clamps yet but that shouldn’t be a problem. ASt the moment I’m using the cheap one from my current unicycle.
It’s a shame that I have to make these changes because I was hoping to at least be able to ride my unicycle with the new frame on there. The rim and tyre won’t be here until after Christmas and after my 4 week holiday on Christmas Day.
I remeber that John Childs told me his 24" x 3" Gazz was 72mm wide at the widest point. Can someone please confirm this?
I’ve got some photos of the frame at http://www.unicyclist.com/gallery/albun59 in the ‘My Unicycles’ section. Here are the main dimensions and other details of my frame:
Top of crown to centre of axle: 355mm
Seat post bit: 150mm, 22.5mm inside diameter, 25mm outside diameter
Inside leg width: 72mm
Outside leg width: 110mm
Crown plate thickness: 6mm
Gusset thickness: 3mm
Gusset depth: 12mm on edges, 5mm at centre of arc.
Tubing size: 30mm x 17mm for main bit, 34mm x 12mm at bearing holders
Frame mass: 0.90kg = 1.98lb
Did I miss anything?
I should’ve just got a whole unicycle from unicycle.com.
(photos at http://www.unicyclist.com/gallery/albun59)