Tire, width, sidewall and overall diameter question
#1
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Tire, width, sidewall and overall diameter question
Right now im running (in the rear) a 275/30/19 (rims are 9.5)
Theoretically
my sidewall hieght would be 275mm X 0.30 = 82.5mm
now if i switch to a not so wide tire, 255/35/19
sidewall height wll be 255mm X .35 = 89.25mm
so the total diameter of the wheel is bigger on the 255 tire by 13.5mm.
BUT
then how come it looks like the tire is thinner on a 255 than a 275 in real life? Is it because of the stretch (255 will be more stretched than the 275 on a 9.5??) and therefore will give the illusion than the tire is thinner?
Ive seen pics of a 255 tire on my rims and it looks alot thinner than my 275 tire (exact same rims and tire brand, just diff sizes.)
Theoretically
my sidewall hieght would be 275mm X 0.30 = 82.5mm
now if i switch to a not so wide tire, 255/35/19
sidewall height wll be 255mm X .35 = 89.25mm
so the total diameter of the wheel is bigger on the 255 tire by 13.5mm.
BUT
then how come it looks like the tire is thinner on a 255 than a 275 in real life? Is it because of the stretch (255 will be more stretched than the 275 on a 9.5??) and therefore will give the illusion than the tire is thinner?
Ive seen pics of a 255 tire on my rims and it looks alot thinner than my 275 tire (exact same rims and tire brand, just diff sizes.)
Last edited by ndk83; 01-29-10 at 03:38 PM.
#2
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Thread Starter
Also is there any advantages/disadvantages in durability and comfort from running a 275mm tire than a 255? or vice versa? which is better
I know the wider the tire the better the ground contact and therefore the grip, but with these sizes isnt marginal?
I got Michelin PS2, and the sidewall is quite thick, which is kinda ugly haha
Im considerign the swtich from:
245/35/19mm (8.5inch wide rim)
275/30/19mm (9.5 )
to
225/35/19mm
255/35/19mm
but from the all the tire calculators it seems like ill be makin my tires beefier (none of them ask for rim width though, so hence my OP)
I know the wider the tire the better the ground contact and therefore the grip, but with these sizes isnt marginal?
I got Michelin PS2, and the sidewall is quite thick, which is kinda ugly haha
Im considerign the swtich from:
245/35/19mm (8.5inch wide rim)
275/30/19mm (9.5 )
to
225/35/19mm
255/35/19mm
but from the all the tire calculators it seems like ill be makin my tires beefier (none of them ask for rim width though, so hence my OP)
Last edited by ndk83; 01-29-10 at 03:41 PM.
#3
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That measurement is if the sidewall was straightened out. If you stretch it over a wider wheel, some of the larger sidewall height gets lost in the now stretched width. I'd stick with what you have
#4
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Thread Starter
funny enough i got my current tire sizes recommendation from CL members
My rim manufacturer recommends the sizes im considering changin to. (255/35/19)
I also just received some spacers (will b at +30 offsets), so will rub on current setup
Last edited by ndk83; 01-30-10 at 07:22 AM.
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