Those of you who have this setup are aware that the space between the Primo
tire and the frame is really tight, maybe 1/16th of an inch. Occasionally
the tire will be bulged slightly and will rub in one spot. This has never
been much of a problem, except for the brand new tire I just put on, which
rubs an annoying amount. Course having it pumped to 85 lbs doesn’t help, but
this was never a problem with the 5 previous tires. Other than rotating the
tire, anyone have any suggestions?
The rim is perfectly true and properly aligned in the fork. It’s just a
slight bubble in one spot on the tire.
I had this problem with my Miyata frame, BFR rim, and Primo tire and switched to an Odyssey Bermuda tire which is narrower (1.75"), which solved the problem until I wore it out and bought 2 replacements. The new one I installed rubbed way too much. So I ditched the Miyata frame and bought a Sem XL frame which dropped right into place no problem. Now I can use the Primo tire which I like much better than the Odyssey, and the frame shoulders will be much better for several types of tricks.
Let me know, Joe, if you want to try one of the Odyssey Bermuda tires and I can bring one or both to the Unatics meeting on the 21st.
Re: Clearance for Primo tire on the Miyata Deluxe 20"
I recently made some indentations on the inside of my Miyata Deluxe frame to accomodate a larger tyre. Paul Wyganowski also did this with my Pashley Muni to give me some extra clearance with my 26x2.6 tyre. The “Wall” by Primo is a great tyre. I usually run 45-55psi, much easier for hopping tricks and more comfortable to ride.
Hey Uturn, thanks for the info. I wouldn’t mind switching frames to fix the problem, but it ain’t in the budget right now. Not sure when I’ll make the next Unatics meet, hopefully soon.
I was surprised to see that you run your primo at 55 psi. I’ve always kept mine at 85 simply because I could and it seem easier to learn pirouettes. I also like the slickness of a hard tire, but maybe I’ll try a lower pressure for a while and work on some hopping tricks.
One detail about my tire pressure… The uni’s that I run the Primo “Wall” tire on get ridden indoors about 94% of the time. When outside I might push it up to 65 psi depending on the surface. On smooth indoor surfaces I’ve found that higher pressure definately makes spins and pirouettes easier, but I felt like I had less control of the uni overall. At lower pressure I can do a spin or pirouette and stop when I want to.
Weird…I just realized, on my Freestyle uni the tire recommends 85 psi and I generally run 30-40 less. On my “Racing” uni I had a 24x1.75 tire that recommended 45psi on the side and I ran that tire at 85.
For unicycling, I’ve found that tire pressure varies a lot with each indiviuals’ weight and riding habits.
> For unicycling, I’ve found that tire pressure varies a lot with each
> indiviuals’ weight and riding habits.
And hall conditions of course. When playing hockey in a hall
with a relatively grippy floor, I’ll use approx 50 psi in
my Primo. In a dusty, slidy hall I’ll use nearer 30 psi in
order to increase the grip (and wash the tyre between
I had this problem with a Kenda Kikzumbut - basically the tire
failed as soon as I got the amount of pressure I wanted in it.
The bulge on my Kenda was definitely due to failed internal structure
of the tire. I now have a Primo “The Wall” on my Miyata and it
seems fine, even pumped up to ~80 psi. I think it’s rated for 85
or so. It is a fairly close fit, but there is enough clearance.
The Kenda was wider and just fit, even before it grew the bulge.
Gardner Buchanan <email@example.com>
Ottawa, ON FreeBSD: Where you want to go. Today.