40 is a percentage not a measurement. So 40% of 265 is smaller than 40% of 275. So 265 is a smaller rolling radius as the tyre wall height is smaller.
That's why I said my 245/40/17 I have on my car is the same sidewall height as my vans 275/35/20.
40 is a percentage not a measurement. So 40% of 265 is smaller than 40% of 275. So 265 is a smaller rolling radius as the tyre wall height is smaller.
That's why I said my 245/40/17 I have on my car is the same sidewall height as my vans 275/35/20.
The "40" bit is not an absolute number, it's a ratio of sidewall to width, so a 275/40 would have a higher sidewall than a 255/40
At least that's what I vaguely remember unless I dreamt it
Edit: Bugger, I took so long to write that, that by the time I'd posted it @RattyMcClelland had explained it far better!
@YESBOY thanks for all the advice...I appreciate it.....with regards to sleep.....I doubt that at the minute....I need to figure this out and cancel Sundays tyre fitting appointment lol...
Pipedream72
Member
Its cos the profile is a % of the width (i.e. 40% of 265 or 275). See my spreadie above....with a 265 width tyre the side wall height of the tyre is 106mm but with 275 that becomes 110mm, which in turn means that the circumference of the tyre is 2262mm with a 265 vs 2287mm with a 275.
Not sure why it would matter that the radius is different....just means rear wheels are rotating at slightly different rate to the front wheels, which should be fine shouldn't it if the axles are turning independently. Maybe it becomes a problem with 4motion as then presumably the wheels all need to rotate at same rte?
Not sure why it would matter that the radius is different....just means rear wheels are rotating at slightly different rate to the front wheels, which should be fine shouldn't it if the axles are turning independently. Maybe it becomes a problem with 4motion as then presumably the wheels all need to rotate at same rte?
Paulriddler
New Member
285/35r20 are readily available with high load ratings, has anyone tried any?
It definitely won’t look too stretched.... I’m currently running 275/40/20 on a 10” rear and that’s not too stretched. What Van have you got T28, T32??
Its a t32 t6. I am wanting inovit turbines and I know they are not load rated for a t32 but I never carry anything in it. I may get shot for admiting that but they are bringing out 1950lbs turbines this year when I rang inovit uk today.
There seem to be better offers on staggered alloys so was wondering what they would look like with those tyres? I want 40 sidewalls for comfort as it has been lowered 50mm on stance ultras coilerovers. Have you any pictures of your van?
I
There seem to be better offers on staggered alloys so was wondering what they would look like with those tyres? I want 40 sidewalls for comfort as it has been lowered 50mm on stance ultras coilerovers. Have you any pictures of your van?
I
You should really speak to @ChrisR at The Van Cave.... he’s an Inovit dealer and will be able to give you all the help and advice you need.... if you buy them from him he might be able to do you a good deal too!
