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Old 11-13-04, 12:22 AM   #1
Alphie
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Beads: Wire vs. Kevlar

I know this has probably been asked before, so please excuse me in advance.

Is there any reason (besides cost) that I should run wire bead 700c x 25 tires on my road bike instead of a good quality Kevlar bead tire? Flats always happen at an inopportune time and to have a tire a little easier to mount would be a very good thing.
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Old 11-13-04, 02:30 AM   #2
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Nope
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Old 11-13-04, 06:03 AM   #3
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Sometimes people choose a wire bead for a tire that mounts on a rim easily (i.e. big bead circumference, small rim circumference), since kevlar can stretch.
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Old 11-13-04, 06:32 AM   #4
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Quote:
Originally Posted by Alphie
I know this has probably been asked before, so please excuse me in advance.

Is there any reason (besides cost) that I should run wire bead 700c x 25 tires on my road bike instead of a good quality Kevlar bead tire? Flats always happen at an inopportune time and to have a tire a little easier to mount would be a very good thing.
Kevlar bead tires have two advantages, they weigh less and they fold so you can pack along a spare more easily if you go on a trip or something. The first time that you mount them can be a trip but my experience has been that they go on much more easily after the initial mounting has given them some shape.

So far as saying which, wire or kevlar bead tires, go on and off more easily by the side of the road, I'd say that the varience within each type is greater than the varience between the two types. To me they're the same.
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Old 11-13-04, 08:37 AM   #5
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Quote:
Originally Posted by roadbuzz
Sometimes people choose a wire bead for a tire that mounts on a rim easily (i.e. big bead circumference, small rim circumference), since kevlar can stretch.
All wrong.
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Old 11-13-04, 09:55 PM   #6
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Thank you everyone, for the input. My next tire purchase will probably the the Kevlar bead variety.
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Old 11-16-04, 04:02 PM   #7
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Originally Posted by sydney
All wrong.
Nuh-uh!!!!

Care to elaborate?
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Old 11-16-04, 07:13 PM   #8
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Kevlar stretches very little. Maybe 1 or 2% at the most. I doubt that any stretch would be permanent.
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Old 11-17-04, 07:56 AM   #9
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for what its worth, I've had Kevlar tires that were very easy to put on and take off, and I've had some that are very very very hard to remove/put on.

these are all mtn bike tires.
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Old 11-17-04, 07:59 AM   #10
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Originally Posted by Rambo
for what its worth, I've had Kevlar tires that were very easy to put on and take off, and I've had some that are very very very hard to remove/put on.

these are all mtn bike tires.
....same with wire beads. Funny how that works.
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Old 11-17-04, 11:53 AM   #11
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Quote:
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....same with wire beads. Funny how that works.
isn't it!?!
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Old 11-17-04, 02:44 PM   #12
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Quote:
Originally Posted by supcom
Kevlar stretches very little. Maybe 1 or 2% at the most.
So, for a tire with a 622 mm diameter bead, ~1.95 - 3.9 cm over the circumference. Probably enough to significant if the tire were loose on the rim to begin with. Wouldn't matter if the stretch were permanent, just lasting until the tire to blew off the rim!
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Old 11-18-04, 05:38 AM   #13
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My Kevlar bead Ritchey Speedmax 2.0 Pro tires are no easier to mount and dismount than my old wire bead Continental Town & Country tires. I expected them to be easier, but they're certainly not. They are considerably lighter though (200g each).
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