Wide tyres on narrow rims

[irlt6]

What's the widest tyres you could put on a t6.175 50 kph.the rims are 15x38" rears and 12x28" fronts and currently have 420/70/28 and 520/70/38 I would like to go up to a set of 480/70/28 and 580/70/38 if possible without changing the rims?

 

[nick...]

I’m certain you will get a 20.8 on a 15 inch rim or what ever it is in new money and probably a 18.4 on the front.
Nick...

 

[seedman stains]

Im looking at a swop at present 540/65 x38 seem about the max for that size perhaps a bit tight unless having a slightly higher sidewall helps

 

[Brisel]

@Terry Elsey Tyres

 

[irlt6]

I’m certain you will get a 20.8 on a 15 inch rim or what ever it is in new money and probably a 18.4 on the front.
Nick...

I was thinking that but my Tyre man told me the side walls would be squeezed in too much and the Tyres would start to crack

 

[KB6930]

I was thinking that but my Tyre man told me the side walls would be squeezed in too much and the Tyres would start to crack

520 is a 20.8 your next size will be a 580 but that's up an aspect ratio to 75 . Then it'll be a 600 which will be the same ratio as your 520/70 is

 

[Farmer_Joe]

ha ha i put 20.8 on 12 inch ri they were ok no cracking thats total nonsense.

my mf has 15 inch rims i believe with 600s on rears i will check tomoz

 

[kill]

What's the widest tyres you could put on a t6.175 50 kph.the rims are 15x38" rears and 12x28" fronts and currently have 420/70/28 and 520/70/38 I would like to go up to a set of 480/70/28 and 580/70/38 if possible without changing the rims?

I swapped from 520/70r 38's to 600r 38's on the same rims and working just fine.

 

[Nearly]

I was thinking that but my Tyre man told me the side walls would be squeezed in too much and the Tyres would start to crack

There's a list of accepted rim widths for sizes of tyres. If you put them on a narrower one you can kiss goodbye to any warranty claim. It's not worth it if fitting new tyres.
If it's just an older classic getting hand me downs off a front line tractor then it's fine.

 

[Chae1]

Don't go too wide. I put wider tyres on a narrower rim. Tyre guy said it would be fine, but was just a pest, constantly going out in morning to find front tyre flat.

 

[Sid]

Rims will have a stamp to show size.

Then go find a chart online to reference tyre sizes

 

[C.J]

What's the widest tyres you could put on a t6.175 50 kph.the rims are 15x38" rears and 12x28" fronts and currently have 420/70/28 and 520/70/38 I would like to go up to a set of 480/70/28 and 580/70/38 if possible without changing the rims?

The rims you have were meant for 14.9R28 (380)and 18.4R38(460)

You are allready one size over.

 

[Michael S]

You could consider going taller, 85 profile, if the tyres fit under the mudguards? Without checking a tyre catalogue 15 inch sounds quite narrow even for a 520? I know Trelleborg do some sizes in a NRO, narrow rim option, probably some other manufacturers too.

 

[wdah/him]

tire fitter told me I could replace 16.9 r38 with 18.4r38 with no problems, he did ask what the tractor ws doing and it wasn't doing any real heavy work for long periods. was mostly for fert and general yard tractor. I haven't done it yet as it that made me question how wide I could go all round.

I assume if the tractor was to work with a tanker or heavy haulage work he would have turned it down and stuck with 16.9.

would any of that apply to you

 

[Flat 10]

The rims you have were meant for 14.9R28 (380)and 18.4R38(460)

You are allready one size over.

I agree

 

[snarling bee]

A wider tyre might fit on narrower rims, but you will be better with the proper rims to get the maximum benefit from the wider tyre. They are designed to work best on the correct rim.