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27 inch tire blowing off the rim

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27 inch tire blowing off the rim

Old 07-22-21, 09:31 AM
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Frejuser
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27 inch tire blowing off the rim

Good morning - first post here. I'm restoring an '61 Legnano Gran Premio with original Fiamme 27 inch clincher rims. I've tried Panaracer Pasela as well as Gatorskins tires, both have blown off the rim with the tire exploding. No bead on the rim. The tires were "too easy" to mount so I had suspected this may happen and slowly pumped it up checking every 5 pumps. Thought it was going to be successful when a few minutes later: BANG! Any suggestions with what tires to run here? Thanks.
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Old 07-22-21, 09:41 AM
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What is the tire size you're running, and what pressure are you running?

Quite a few of the 27" rims were "Hookless", and not particularly designed for high pressure.

Are the sidewalls of your rims straight, or is there a hook near the edge?
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Old 07-22-21, 09:54 AM
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Originally Posted by Frejuser View Post
Good morning - first post here. I'm restoring an '61 Legnano Gran Premio with original Fiamme 27 inch clincher rims. I've tried Panaracer Pasela as well as Gatorskins tires, both have blown off the rim with the tire exploding. No bead on the rim. The tires were "too easy" to mount so I had suspected this may happen and slowly pumped it up checking every 5 pumps. Thought it was going to be successful when a few minutes later: BANG! Any suggestions with what tires to run here? Thanks.
If your rims don't have hooks, it will be safer to run wire bead tires. Folding tires will give you trouble.
Even with the wire beads, some will work better than others.
I've had good luck with the wire bead Panaracer Pansela, I don't inflate over 80-90.
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Old 07-22-21, 10:07 AM
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+1, you required non-folding, wire bead tyres. The beads in folding tyres are too flexible and require a hooked rim to to aid in seating
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Old 07-22-21, 11:40 AM
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What pressure are you inflating to? Back when non hook bead rims were the norm most tires recommended no more than 70 psi
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Old 07-22-21, 12:40 PM
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As others have said, if hookless rims you are gonna want wire bead tires at a lower pressure. I learned this the hard way several times. +1 to Paselas.
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Old 07-22-21, 12:52 PM
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Same here -- I ran wire bead non-folding Paselas in 27 x 1 1/4 at around 60-70 psi and never had any issues. First ran them on vintage Super Champions, then Weinmann touring rims from a 1985 bike, so neither rim set had hooks. It was a commuter that I rode 2-3 times a week for a couple of years.
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Old 07-22-21, 02:41 PM
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Originally Posted by noobinsf View Post
Same here -- I ran wire bead non-folding Paselas in 27 x 1 1/4 at around 60-70 psi and never had any issues. First ran them on vintage Super Champions, then Weinmann touring rims from a 1985 bike, so neither rim set had hooks. It was a commuter that I rode 2-3 times a week for a couple of years.
Yup -- the lower pressure is the key.
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Old 07-22-21, 02:54 PM
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Originally Posted by Frejuser View Post
Good morning - first post here. I'm restoring an '61 Legnano Gran Premio with original Fiamme 27 inch clincher rims. I've tried Panaracer Pasela as well as Gatorskins tires, both have blown off the rim with the tire exploding. No bead on the rim. The tires were "too easy" to mount so I had suspected this may happen and slowly pumped it up checking every 5 pumps. Thought it was going to be successful when a few minutes later: BANG! Any suggestions with what tires to run here? Thanks.
First off - welcome! Always great to see another Legnano owner bringing a noble steed back to life. Yes, we’ll want to see pictures.

Not much to add beyond what others have said about tire compatibility. I recently put some Vittorias on my non-hooked rims and it took a bit of fiddling but all seems okay now. If it is still a problem, tubular rims/wheels would be very appropriate and nice ones can be found for very good prices. I bought a vintage set with entry level Campy hubs for $60 and they spin like butter.
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Old 07-22-21, 04:56 PM
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What brand of rims on the Legnano?

Quite a few old Weinmann clincher rims were prone to blow-off at modest pressures as low as 75psi using almost any wire-beaded 27" tire.

I think that the quality control of the diameter was the reason that some rims did or did not suffer this issue. Newer (still hookless) rims seemed to improve on their bead-retaining ability, and I remember 1970's Japanese single-walled rims reliably containing 100psi.
All the Super-Champ 27" rims I've seen had at least some bit of a bead-retaining lip or nub, and none have given me trouble.
But pre-~1977 Weinmanns are a crap-shoot it seems.
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Old 07-22-21, 05:34 PM
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...if you really want to experience what your Legnano is capable of in terms of speed and handling, it behooves you to rebuild those wheels with a more modern, hook bead rim. The rims will be lighter, so less rotating weight. You can switch to 700c so you can access better tyres. And you can inflate them to pressures that will allow faster riding, if you weigh more than 120 pounds soaking wet.

Even paying someone to do it is well worth the investment. There are a number of candidate rims, with the Sun M 13ii one of the more economical choices, that still look reasonable on an older bike.
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Old 07-22-21, 05:49 PM
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Agree, wire bead is key for hookless rims. For pressure, I started with 50, let it sit for a day, then increase it 5 lbs a day. For the rims I had 65 would work. 70 would blow off eventually (lot's of fun if in the middle of a ride). I did pick up some hooked rims, and they made the riding experience much better.
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Old 07-22-21, 06:39 PM
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Why not tubulars, if you're going to be swapping rims and tires anyway?
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