A request to anyone riding a fat bike, with access to a wider tubular tire.
It may also proof interesting for some 26" and 29" XC setups.
I used to be all into the freakiest of tire setups, intrigued by existing products such as tubulars and tubular clinchers, and the uprise of latex tubless.
I had an idea, originally meant to solve the issue of bead seating (prevent burping) at low tubeless tire pressures.
It consisted of a regular rim, regular tire (although a specific fit would be required), some tire selaent, and, hold on for it...a lightweight road tubular.
The idea was this: you don't use a tub, but a tubular. The tubular would inflated first, to high pressure, to press the tire beads against the rim at say 70psi. The narrow tubular would sit in between the tire hooks, inflation as you know decreases its diameter, causing it to "hug" the rim. I know it's not with a low of concentric pressure, but hey it was my little idea.
So the tire would now be inflated to a ridiculously low pressure, and not be ripped off the rim.
Two interesting side-effects in this setup:
- The tubular would stick out above the rim's outer diameter, and form a cushing in snakebite conditions. Or provide a ride-home aid, again, the beads would stay snug. Commercial products exist to take this role, and this role only.
- The tubular being at higher pressure than the actual tire, makes it relatively unrespensive for volume, it's rigid. It's air volume stolen from the tire.
Now, with rim-tire interfaces improving, I am focussing on the latter side-effect.
Reduced air volume, for a given tire size.
It would a small reduction, say 10% in an XC setup, and might actually prove beneficial in certain conditions. It might increase rebound of a tire, making it more responsive to the surface, and possibly roll quicker. Upon impact, say a drop-off or a curb hidden under the snow, the initial response of the tire would not be affected. However, as the tire is deformed more, per cm of intrusion of the curb, resistance would ramp up quicker, as the smaller volume causes pressure to increase quicker.
And then when the object really gets close to the rim, there is the tubular to take some of the hit at increased pressure. It only kicks in that way when touched by the tire profile.
If someone has a fat bike (I don't have money nor room for it) and say a volumous CX tubular or even the now available larger ~45mm Dugasts, they could stick one in and see how it affects handling.
I only rode a fat bike once, when the Pugsley was new to the scene, and got the idea that one of two things could help: either a piggy bag to increase air volume or dampen pressure increase from impacts, or the opposite: decrease tire air volume.
I'd be VERY grateful if someone could test my little idea. The effect will be most apparent when the tubular's diameter is closer (%) to the tire's.
And, I suppose with a supple tire which you'd like to run at low pressure, but can't deal with the rim hits you'd get, for instance on root infested trails.
You may get away with not drilling an extra valve hole, but it would be easiest.
And I bet it would work with a tube, but tubeless surely would be relatively easy to deal with.
Looking forward to your ideas, but please be civil.
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