tyre size, can I change?

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yoashman

New Member
Posts
11
Location
Scootlund
Hey,

Im wanting to get some new tyres for my Landy 90, the current tyres are 245 70 15, but I am finding it hard to find any tyres on the internet of that size (Im looking for mud tyres), can any of you suggest a tyre of that size, or is it possible to change the size of the tyre without affecting the landys handling/safety, say to 245 70 16 for example? Any help you can throw my way would be grand, cheers.
 
yoashman said:
Hey,

Im wanting to get some new tyres for my Landy 90, the current tyres are 245 70 15, but I am finding it hard to find any tyres on the internet of that size (Im looking for mud tyres), can any of you suggest a tyre of that size, or is it possible to change the size of the tyre without affecting the landys handling/safety, say to 245 70 16 for example? Any help you can throw my way would be grand, cheers.
Click to expand...
Well if you've got 15" rims, putting 16" tyres on isn't gonna work! :doh:
 
Hey, yeah done a search, and realise I cant alter the rim size, but cheers;).

Guess I didn't make myself too clear, the numbers 245 70 15, is it possible to adjust the first two numbers (245 70), with out to much of a bother on the landy? Do I only really have to worry about the rime size? Just looking for a bit of advise or a possible "check these out" is all. Cheers.
 
Simple answer: yes, you can alter the first 2 numbers. BUT you need to understand what those numbers are, and not run a mix of different sizes or profiles on different wheels, because its a permanent 4WD car. If you're having supply issues with 245/70 15 tyres, then by all means switch to a similar (but not the same) tyre size. I'm afraid I can't help with details because my LR, (along with 95% or so of Land Rovers, I imagine), has 16" wheels not 15".
 
yoashman said:
Hey,

Im wanting to get some new tyres for my Landy 90, the current tyres are 245 70 15, but I am finding it hard to find any tyres on the internet of that size (Im looking for mud tyres), can any of you suggest a tyre of that size, or is it possible to change the size of the tyre without affecting the landys handling/safety, say to 245 70 16 for example? Any help you can throw my way would be grand, cheers.
Click to expand...


I'll help you out, because i'm in a good mood!

245 is the width of the tyre's tread, in mm. 70 is the height of the sidewall, expressed as a percentage of the tyre's width ( ie, the tyre wall is not 70mm tall, it is 70% of 245, tall. In this case 171mm) 15 is the wheel diameter ( which is the same as the tyres internal diameter! - for this reason, you cant switch from a 15 to a 16, without buying 16" wheels)

If you were to chance, lets say, from a 245/70/15 to a 265/70/15, as well as increasing the width of the tyre, you have increase the height of it too, as 70% of 265 is 185.5mm. This affects the gearing of the car, as it was originally designed to run on a tyre with a set rolling circumference ( the amount of distance travelled per circular rotation). This will also affect your speedometer accuracy, as the speedo makes its reading based on a known tyre circumference, which you're about to change.


Then you have to take into account whether or not the wheels will physically fit onto the car, without fouling any of the suspension components, whether you can actually turn the wheels without rubbing things like wheel arches / liners. Finally, will the tyres stick out past the wheel arches? if so, you need new arches, or thinner tyres as it's illegal.

look on a website like this one, enter your current sizes and the sizes tou want to change to, it'll tell you whether or not you can do it.

Sounds really complicated, its not too bad. Do a search at the top of the page, it'll give you all the help you need.

TYRESAVE: Tyre Size Calculator
 
yoashman said:
Hey, yeah done a search, and realise I cant alter the rim size, but cheers;).

Guess I didn't make myself too clear, the numbers 245 70 15, is it possible to adjust the first two numbers (245 70), with out to much of a bother on the landy? Do I only really have to worry about the rime size? Just looking for a bit of advise or a possible "check these out" is all. Cheers.
Click to expand...
that size is well small for a defender i bet they look well gay:eek:
 
Good stuff, some good advice there, cheers for the help, and some real poncy stuff too, but I wont worry too much about that. But yeah, your right, that size would look a bit gay, fortunately for me I got the size wrong, it is a 16 inch rim, so I don't have to worry what strangers would think of me whilst Im driving:(, as I guess the inch makes all the difference.
I will post a picture of my landy tomorrow. Honest mistake on the sizing, but Iv never claimed to be a 4x4 guru, I just need it to get my self to work (miles and miles of dirt tracks in Caithness and Sutherland, forestry work, pic's of that to follow as well). Cheers
 
Mike_B said:
I'll help you out, because i'm in a good mood!

245 is the width of the tyre's tread, in mm. 70 is the height of the sidewall, expressed as a percentage of the tyre's width ( ie, the tyre wall is not 70mm tall, it is 70% of 245, tall. In this case 171mm) 15 is the wheel diameter ( which is the same as the tyres internal diameter! - for this reason, you cant switch from a 15 to a 16, without buying 16" wheels)

If you were to chance, lets say, from a 245/70/15 to a 265/70/15, as well as increasing the width of the tyre, you have increase the height of it too, as 70% of 265 is 185.5mm. This affects the gearing of the car, as it was originally designed to run on a tyre with a set rolling circumference ( the amount of distance travelled per circular rotation). This will also affect your speedometer accuracy, as the speedo makes its reading based on a known tyre circumference, which you're about to change.


Then you have to take into account whether or not the wheels will physically fit onto the car, without fouling any of the suspension components, whether you can actually turn the wheels without rubbing things like wheel arches / liners. Finally, will the tyres stick out past the wheel arches? if so, you need new arches, or thinner tyres as it's illegal.

look on a website like this one, enter your current sizes and the sizes tou want to change to, it'll tell you whether or not you can do it.

Sounds really complicated, its not too bad. Do a search at the top of the page, it'll give you all the help you need.

TYRESAVE: Tyre Size Calculator
Click to expand...


seee post #2 :rolleyes:
 
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