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Thread: 275/40/17 same as 275/40/18?
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09-15-2005, 01:42 PM #1
275/40/17 same as 275/40/18?
Iam getting new wheels and I currently have 275/40/17" tires on all 4, the new wheels are 18x9. Is the 275/40/18" tire the same size as the 17" the only difference being the size of the hole for the wheel?
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09-15-2005, 04:16 PM #2
- Join Date
- Jun 2002
- Location
- Montreal, CANADA
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- 49
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triple-black- 2000 CamaroSS convertible
you need 275/35-18.
stock size = 275/40-17
means 275mm width
sidewall = 40% of 275mm = 110mm
overall diameter = 2x sidewall + rim-size = 220mm (8.66") + 17" = 25.66"
now, 275/35-18
means 275mm width
sidewall = 35% of 275mm = 96.25mm
overall diameter = 2x sidewall + rim-size = 192.5mm (7.58") + 18" = 25.58" (very close)
if you were to use 275/40-18
means 275mm width
sidewall = 40% of 275mm = 110mm
overall diameter = 2x sidewall + rim-size = 220mm (8.66") + 18" = 26.66" (would be quite off)
Hope this helps.Eugenio_SS
almost stock triple-black 2000 SS convertible with 17x11s on all 4 w/ 315s at the track or on the street with 18x10.5s on all 4 w/ 315s: (1), (2)
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09-15-2005, 07:29 PM #3
Hey Eugenio, since you seem to be the wheel/tire man, I have a question. I have 275/40/18 on my rear tires and want to know if these are bad for traction. I know dedicated drag racers use small wheels with lots of sidewall, but if this setup works for corvettes it can' be that bad?
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09-15-2005, 08:39 PM #4
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- Jun 2002
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- Montreal, CANADA
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triple-black- 2000 CamaroSS convertible
Originally Posted by 91Z28
as for traction, it's not really a matter of a given size.
it depends a lot more on the compound and suspension setup than size itself.
another thing is sidewall helps for deflection, so having a 275/40 either on 17 or 18s would allow for roughly the same lee-way.
18s do offer more rotational mass, and on top of that further away from the center of rotation, increasing rotational inertia... which won't help... but you'll be fine.
i use BIG skinnies 315/35-17 even when @ drag... and they are over 55lbs on each corner.
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09-16-2005, 08:40 AM #5
Thanks EUGENIO!!!!!!!!
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