Does anyone do this?

[smegballs]

My cycling-mad, lycra-clad brother told me about something he does on his commuter and training bike to aid puncture proofness.

He cuts the sidewalls off old tyres, trims the width as needed and puts it on the inside of the new tyres, so that any puncture has two layers of rubber to penetrate before it can hit the tube.

Is this a thing?

https://i.imgur.com/4ENOEgi.png

Grey = Rim
Black = New Tyre
Green = "Armor" belt from old tyre
Blue = Inner Tube

[drbaig]

I don't know if it is a thing. it shouldn't be.

As long as you have some decent tyres, they should give you reasonably good puncture protection.

Some of the really lightweight roady tyres are notorious for punctures so expensive is not always the best option.

I think the most respectable tyre amongst cyclist in Britain regarding weight to performance is the gp4000s.

Cyclocross and mountain bike tyres on tarmac roads do not get punctured, if you are ever so unlucky to have one hell must have froze somewhere.
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[bamt]

You can buy protection strips that do the same thing - I used them on my MTB for a while. A problem is that you can get rubbing of your inner tube at the edges of the strip - which I can only imagine would be worse using an old cut-down tyre.

If you want puncture protection on road tyres, go for Marathon Plus. There's 5mm of protection strip built into the tyre, they are very, very hard to get a flat on.
However, they also weigh about 2-3 times what a normal tyre does, and ride hard. Not the most comfortable things, but if you are training then increases the effort nicely and makes your light tyres used for events feel much faster

I use them over winter on my commuter, and have done serious distances on them (like 500 mile weekends including a couple of night-time crossings of Snowdonia at the end of January - when you really, really don't want a flat as that can get dangerously cold fixing them), but for general riding I prefer a good quality tyre like the GP 4 Seasons. They tend to only start picking up punctures towards the end of their life.

[KLR600]

It's a thing. An old thing but still a thing.

I used to do this but instead of using an old tyre I'd cut the valve out of an old inner tube and then cut it all the way around along the inside. Then I'd wrap it around the new tube making a double thickness inner tube. More protection against pinch flats and general punctures but less weight than two tyres on one wheel.

Note that I used to do this on mountain bikes which were heavy at the time any way and you tend to run tyres at a lower, more puncture-able pressure. I wouldn't be keen to do it on anything that was going to spend most of it's life on the road. I've now discovered DH inner tubes (like normal tubes just a bit thicker) and off road tyres have improved a lot over the years so I don't bother with double skinning tubes any more. When I had my XC bike that I used on the road I just pumped the tyres up to 70psi and watched out for glass and never had a puncture.

If you do this double tyre thing on both wheels you could be adding over 1kg of unsprung weight to the bike which isn't going to be pleasant at all.
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[lihp]

I bet I could change an inner tube at the road side quicker than it would take to bother cutting sidewalls out and putting them in between the tyre/tube.
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[chris-red]

Schwalbe Marathons, I've never had a puncture with them, TOUCH WOOD.
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[KLR600]

[Frost]