21 replies to this topic

[jmmini]

Not sure if I've put this in the right section but, how hard, if possible would it be to stretch 4.5" tyres onto 6" rims. I've seen it done with other sizes, but is it something I could do on a tyre machine?

[Bungle]

pumping air into the tyre does the stretching

if your struggling a ratchet strap around the tyre might help

don't forget to tell your insurance company you have unsuitable tyres fitted to cover your bum

[Noah]

There are specific machines to do it, but its unsafe, stupid and you're putting more stress on the bead of the tyre. Meaning it will just pull of the tyre and cause you to have an accident.

Edited by Noah, 03 March 2013 - 05:15 PM.

[Spud_133]

Last time I looked you use the same tyres for both 10"s and 12"s so no need to have undue stretch and inform your insurer

[Tomm]

You fit the tyres as you would always do, setting the bead is the hard part, or what most people struggle with. There are various ways of doing it, Ratchet strap as Bungle says, or a few other methods, one with "deoderant" and another with two inner tubes. You only really need to do this on very stretched tyres though. I once fitted a 215 on a 9J with no troubles at all, just filled it with air and it set the bead fine.

What sizes are you wanting to fit on to what size whees? Sidewall rating will also effect the way it sits. Personally I think it looks a little daft on a mini, a set of big old A032's/A048's are what I like to see.

[jmmini]

If it's that unsafe I'll just not do it, but I've just been told by a friend that you can use hairspray to seat the bead!?

[jmmini]

You fit the tyres as you would always do, setting the bead is the hard part, or what most people struggle with. There are various ways of doing it, Ratchet strap as Bungle says, or a few other methods, one with "deoderant" and another with two inner tubes. You only really need to do this on very stretched tyres though. I once fitted a 215 on a 9J with no troubles at all, just filled it with air and it set the bead fine.

What sizes are you wanting to fit on to what size whees? Sidewall rating will also effect the way it sits. Personally I think it looks a little daft on a mini, a set of big old A032's/A048's are what I like to see.

It would have been 12x4.5 on to 12x6 rim because I've just bought some good tyres but I'm getting new wheels now. I'll just have to buy some useless falcons for now :'(

[Noah]

If it's that unsafe I'll just not do it, but I've just been told by a friend that you can use hairspray to seat the bead!?

Well, the claim that.

I've used a tyre machine a fair few times, I quite enjoy fitting tyres if I'm honest, In my opinion it's stupid and unsafe, leaning the sidewall inwards is pulling on the bead thats seated on the rim, so it will pull of in theory.

[Spud_133]

If there 165/60 r12 then should it be alright

[jmmini]

If it's that unsafe I'll just not do it, but I've just been told by a friend that you can use hairspray to seat the bead!?

Well, the claim that.

I've used a tyre machine a fair few times, I quite enjoy fitting tyres if I'm honest, In my opinion it's stupid and unsafe, leaning the sidewall inwards is pulling on the bead thats seated on the rim, so it will pull of in theory.

I used to enjoy the tyre machine, but I couldn't do it for a job! Apparently you spray hairspray inside the deflated tyre and when you ignite it, the bead pops on.

[Tomm]

I used to enjoy the tyre machine, but I couldn't do it for a job! Apparently you spray hairspray inside the deflated tyre and when you ignite it, the bead pops on.

Same as the deoderant method. Spray it in the rim/bead gap, it ignites, consumes the air inbetween the tyre and wheel and it pulls the bead onto the rim. I always take the valve pin out otherwise it makes a really strange noise, not my favoured method, scares the crap out of me every time.

The two inner tube method works a lot better, much preffer it to be honest.

[Artful Dodger]

You want to fit 4.5 inch tyres to 6 inch wheels. Why? Can't you use normal 165s??

[Bungle]

The two inner tube method works a lot better, much preffer it to be honest.

how does that work ?

do you have to drill a second valve hole in the wheel rim ?

[Tomm]

The two inner tube method works a lot better, much preffer it to be honest.

how does that work ?

do you have to drill a second valve hole in the wheel rim ?

When the tyre doesn't sit on the bead there is a gap which the air leaks through (obviously).

You take two inner tubes, the sort in toddlers bikes with the really small wheels. You stretch these innertubes either side of the tyre and the wheel rim and inflate them. This gives you an air tight seal so that you can then inflate the car tyre and it will pop itself onto the bead of the wheel. As you inflate the car tyre you deflate the inner tubes and you can then remove the innertubes.

I will see if I can find you a video Bungle.

[Tomm]

[url="http://www.youtube.com/watch?v=lzxHYEdA8Qo&feature=player_detailpage"][/url]