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Morris Minor Chat

Tyre (tire) advice.

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WAYNET2711 Wayne Theron
Kokstad, Natal, South Africa   ZAF
HI

I have never measured the rims but to the best of my knowledge the rims are standard on the car.

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0123 Mike D
Biddulph, Staffs, UK   GBR
Nice one Jim thumbs up Thanks smiling smiley

In reply to # 33069 by emjay Tires come in many sizes. Wheels come in many sizes. Wider tires are mounted to wider wheels. Narrower tires are mounted on narrower wheels. Looking at the issue from the manufacturer or designer viewpoint, they design around a particular wheel for a particular size and do all their testing with that combination to optimize various characteristics such as heat build up, tire life, and traction. Most likely they then extrapolate the requirements to the other sizes instead of testing each size offered. We don't know if anything was optimized and verified for a three inch wide wheel. The fact of the matter is a standard Minor wheel has few options so trade offs are expected.

Maybe it all comes down to geometry. Considering radials there is a bead width and tread width, which is generally straight due to the radial construction. These two widths are statically parallel, which is something one would like to maintain. The difference in bead width and tread width will establish the angles of the side walls. If they are vertical, the tire will behave like a parallelogram with side loading and the tread will stay flat. Of course everything flexes rather that rotates, but you can see if the wheel width is significantly narrow or wide, the sides will be at a significant angle causing the tread to fall inward like Ackerman steering arms. Now bear in mind how the belts are radial and don't lend themselves to be a segment of a cone thus putting more stress on the construction which can't be a good thing. With all that in mind, the designers probably have an optimum rule of thumb for the side wall angle.

0123 Mike D
Biddulph, Staffs, UK   GBR
In reply to # 33070 by WAYNET2711 HI

I have never measured the rims but to the best of my knowledge the rims are standard on the car.

Thanks Wayne thumbs up

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0123 Mike D
Biddulph, Staffs, UK   GBR
0123 Mike D
Biddulph, Staffs, UK   GBR

0123 Mike D
Biddulph, Staffs, UK   GBR
I wonder if I may complement Jim's wise words.

Those of you who have played contact sports will know that you have a better chance of staying on your feet when someone runs into from the side if you have your feet apart.
Up to a certain point, the further apart the better.

It's much the same with car tyres when they get a sideways force.
Every bend exerts a sideways force on a tyre.
Ditto every camber, and every gust of wind.

Tyres stay on their feet / beads better when their beads / feet are apart.
Up to a certain point, the further apart the better.

Tyre data permitted rim section tells us how far apart the tyre beads need to be to keep the tread on "it's feet" / keep the tread's grip on the road surface.
It also tells us what is too far.


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0123 Mike D
Biddulph, Staffs, UK   GBR
4 5J / 5" by 13" wheels if your wish to fit wider tyres thumbs up

165 82 section by 13 give you about the same gearing as 145 82 section by 14 smiling smiley

smileys with beer No wrong rim width worries here smileys with beer

https://www.ebay.co.uk/itm/292701448791?ViewItem=&item=292701448791

Nasher Dougal Cawley/A
Doncaster, UK   GBR
Have any of you tried the 145R14 Pirelli Cinturato?

0123 Mike D
Biddulph, Staffs, UK   GBR
In their day, nearly as good as Michelin winking smiley

Nasher Dougal Cawley/A
Doncaster, UK   GBR
You can now get a 145R14 Pirelli Cinturato

Or you also get the 155R14 Michelin X as well.

Matt from Practical Classics tried the 145R14 Cinturato and said he thought it was the best tyre for a Minor

0123 Mike D
Biddulph, Staffs, UK   GBR



Edited 2 time(s). Last edit at 2019-02-02 10:01 AM by 0123.

Nasher Dougal Cawley/A
Doncaster, UK   GBR
In reply to # 34329 by 0123 Both are gear the car down.

The Cints gear it further
than the Michelins.

compare to what?

0123 Mike D
Biddulph, Staffs, UK   GBR



Edited 2 time(s). Last edit at 2019-02-02 10:02 AM by 0123.

Nasher Dougal Cawley/A
Doncaster, UK   GBR
In reply to # 34341 by 0123 4.00/4.50 tyres yer 'onour yawning smiley)

i dont understand?

0123 Mike D
Biddulph, Staffs, UK   GBR



Edited 1 time(s). Last edit at 2019-02-02 10:02 AM by 0123.

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