Can I put a 17 inch tyre on a 19inch rim?

Simple answer, Try it. And if you bugger the 17" tyre then you'll know.

No - they won't fit. Even if you could squeeze them on without breaking something I think you would void your insurance when something went wrong

No. Tyres have a high tensile multi strand steel cable inside the thick rubber section that contacts the wheel. If that section was just rubber, you would have no hope of keeping them on the rim.

You would need heavy hydraulic equipment to stretch it out to fit a larger diameter wheel. That would not only be illegal but very dangerous.

You could try and seal the minus 50.8 mm size. Large truck tyre irons may help the fitting. Where there is a will there is a way.
Not so stupid as ridiculous and impossible.

you can.t be serious
mechpete

You would have more chance of stapling water to a tree !

Thanks guys much appreciated for your comments

19" - 17" will tell you how much you'll miss by.

HI
Really give it a try!!
Send me a text and I will video the fit up and driving come crash . LOL

Totally red neck ,must be from Melbourne !!!

WTF NO

I’d like to thank Darian for the only sensible answer to the OP’s question, and RonN is absolutely correct as well

Chris,
Yes , simple as that , the last numeral in a tyre size is the diameter.
One will not fit another size rim.
and no they won’t stretch . The bead wires will break if you had something that could try to stretch it.
(25 years in the tyre industry I might know)

To the other posters
perhaps unless you know for sure what you’re talking about, wait for a bit and see if someone with the right knowledge replies.

And certainly no reason to be nasty!

hi
There are Tyre and rim association standards . I`m sure there would be a legal reason as well from the same association .

Re fitted tyre to vehicle have same rim size /diameter . Unfortunately because it comes from factory it ""must be legal "". So this would be evidence of legals .
For a tyre fitter /mechanic it would be regarded as incompetence and a jailable offence .

Can u interchange/mix tyre/rim diameters NO

In a life threatening emergency yes , but I doubt its possible anyways .

Its a bit like reusing head gaskets . In the short term overheating happens twice and the jobs done twice . That's if the the motors not completely cooked the 2nd time .. Pointless costly exercise . The tyre could possibally cost your life.

There are tyre retailers who do practice poor fit ups . Tyres to wide for rim .
Poor wear and the risk of tyre blowing off the rim .

The tyre industry is not regulate and no experience or license required .

The only qualified person technically is a mechanic .
The worst part about is the award is minimum wage around 18--20$ for mechanics . A very very unregulated industry .
Most of the tyre retailers shouldn`t be paid the money they earn .