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modern tires on hookless rims?

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modern tires on hookless rims?

Old 07-10-15, 05:36 AM
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JonathanGennick 
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modern tires on hookless rims?

What's the experience with running tires having hooked beads on rims that are hookless?

Folding tires. Not wire-beaded.

Reasonably safe? Dangerous as heck? Somewhere in between?
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Old 07-10-15, 06:42 AM
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If you keep the pressures below 75 PSI you have a chance that they will work okay maybe even less. Roger
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Old 07-10-15, 06:43 AM
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Originally Posted by rhenning View Post
If you keep the pressures below 75 PSI you have a chance that they will work okay maybe even less. Roger
+1
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Old 07-10-15, 06:48 AM
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Old 07-10-15, 07:00 AM
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Based on my quick driveway test using the original and threadbare tires on the bike, 40 psi is plenty.

Am waiting here in my office for the rear tire to go "bang!". Rotted sidewalls. Cotton fabric exposed. It's bulging out pretty inauspiciously. Am surprised it held up to my pedaling back and forth in the drive just a few minutes ago. New tires clearly are needed.
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Old 07-10-15, 11:50 AM
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Threw on the new tires over lunch. There is a definite bump, or ridge, on the inside walls of the rims. It's not as defined and "edgy" as I'm accustomed to on modern rims, but the inside rim wall is not flat and there is some sort of ridge there presumably to hold in the tire.

I don't think that ridge counts as a hook. The tires do feel securely in place. I may change them out though, for something w/a wire bead.

The bike is a Schwinn Varsity from whenever they were experimenting with front-freewheels and positronic shifting. I'll grab the year later from the serial number.

Last edited by JonathanGennick; 07-10-15 at 12:34 PM.
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Old 07-10-15, 03:19 PM
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A 70's/80's Varsity always came with particularly heavy steel, hookless rims, but something like Araya semi-hooked alloy rims may have been substituted.

The semi-hooked rims seem to depend somewhat on less-aged tires with better-gripping rubber on the bead area for good retention. I've had aged tires blow off these rims, both wired and folding tires.

Never use a folding Kevlar-beaded tire on a hookless rim, since these beads will stretch over time when subjected to hookless mounting stresses. Steel beads never stretch over time, so their seating and thus retention is assured by their close fit to the base inside diameter at the outer edges of the rim's inside floor, adjacent to the sidewalls.
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Old 07-10-15, 03:31 PM
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modern tires on hookless rims?

Thanks dddd. I'm sure the rims are original. The words "heavy steel" apply.

I'll buy a set of wire bead tires and swap those in sometime next week.
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Old 07-10-15, 04:41 PM
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I've combined new tires with old hookless rims fairly brazenly, and only experienced a recurring issue with one particular combo, which happened to be Araya 1-1/4" ally rims and Forte GT2 tires, also 1-1/4", wire bead. Needless to say, once I realized it was a bad combo, I discontinued it.
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Old 07-11-15, 03:56 PM
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The original Schwinn steel rims have their own issue, in that the inside "base" diameter of the rim is on the big side, meaning that many current steel-bead tires may need repeated inflation attempts from a deflated state to fully seat the tire beads evenly up on the base shoulders adjacent to the inside corners of the rim.

I spray some rubbing alcohol about the bead-seating areas of tire and rim first, then hope for a bit of luck in getting the tire seated such that no thumping occurs while riding.

Fixing a flat out on the road with only a minipump usually means I ride home on a not-fully-seated, thumping tire!

Don't put Continental wire-bead tires on the Schwinn rims or seating might not even be possible. Continentals have been too tight for me to fully seat on a few different types of even the alloy rims.
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