Inflated and on the rim. If I’m trying to be precise I’ll put a c clamp over the tire and then measure that. The Duro Wildlife was measured in that manner. Not sure on the rim width, but it was on a UDC 24" rim. The Maxxis 26x4.8 was just measured by placing a tape measure across the tire and eyeballing it. It appeared to be 4 3/8" across on an 80mm rim. Perhaps on a 100mm it would be 4.8".
I measured my duro crux 27.5 x 3.25 using a cheap electronic digital caliper I got from Harbor Freight tools years ago (works great, seems to be within .001 in accurate… I think it was like $14?)
Anyway it came out to 3.194 in wide.
I can’t measure the frame at the place where the tire rubs without removing the wheel, maybe later…
The tire width is supposed to be measured when the tire has a full contact on the ground (all knobs are flat on the same surface). They are still generally smaller than labeled though.
3 Likes
What a ludicrous way to measure it.
Side knobs are there for turning grip - you’re not ever going to have them all on the ground with some tyres.
1 Like
I’ve got a few 29" frames (M4O medium, Oracle 29, Nimbus steel 29, old non-disc brake KH 29)
Are you in Quebec? I live in Michigan, and was on a road trip and in Ottawa last November!
I recently tried the Oracle, Qu-ax carbon post, and M4O Long Handlesaddle, since I wanted the lightest hill climbing setup…It worked, but I found it incredibly flexy. Not sure if it’s just in my head or not… My test was to hold the brake and press down on the front of the handle saddle.
Switching to an aluminum KH adjustable seatpost (my only other 25.4mm seatpost), seemed a bit better; seemed like about 50% less flex.
1 Like
I live right across the river from Ottawa haha.
Bring those frames over next time! We can take a few stats on those frames! 
2 Likes
We have a test jig for testing flex on frames (it tests both deflection and to destruction). Due to the leg profile it is stiffer that a lot of frames on the market. Of course it will still flex but it should not be enough to cause a problem. One of the areas of flex is actually movement in the bearings, this can appear to be frame flex.
The clearance on the frame (height) is lower than it should be for that tyre. anton005 where did get the unicycle from? I will then check on the batch number and determine what it should be.
2 Likes
UDC used to sell this Oracle 27.5 with a 27.5 x 3.0 Kenda Havok tyre. They must have changed it recently. The Duro 3.25 doesn’t seem to fit. I had a similar experience (long time ago) when I bought a Qu Ax 29 with a tyre that rubbed the frame.
Hi Roger,
I got it from udc america. Huh, I never thought it could be the bearings themselves, it’s definitely from that area of the unicycle where it’s flexing. With the tolerances so tight using that tire it wouldn’t take much for it to rub. I didn’t measure, but I think I had more clearance on top than on the sides.
Thanks for looking into this, I really appreciate it. I do love the unicycle, and a 3 inch tire is plenty for me anyway. Might be nice if you could choose a tire when you buy it.
Anton
1 Like
BTW That picture is of my Oracle 27.5 that I just got in the December 2021, just before Christmas, batch from UDC USA.
( they were out of stock for several months before that, got the notification they were back in stock but had limited quantities, ordered promptly 
)
1 Like
Yeah, my 29 is from the same shipment I think, got it a few months ago. I think I ordered it in January this year