Need help with rim size

kinkyllama · Post by **kinkyllama** » Wed Apr 27, 2005 2:58 am

Im going to buy a seperate set of wheels/tires for race purposes.. it will be cheaper and i got a deal from konig, any 15inch for 55 and any 17 inch for 75.

Anyways.. im not sure which will be better. By the time i get them ill have strut bars so my suspension will be beafed up a little more. I think if i go with RACE tires (not sure if im gonna go with street or race tires cuz of classing issues) i wanna go with 15inch wheels cuz the sidewall will be pretty sturdy. I think either way the better bet is 15inch.

Any input would be great.

Im also gonna be buying a 2nd set for daily driving and selling the wheels i currently have... cuz if i sell the wheels i have now for half the price i bought them for i can almost buy 2 sets of wheels with my discount.

Silver Daewoo · Post by **Silver Daewoo** » Wed Apr 27, 2005 4:35 am

If you are thinking about racing, you have to have smaller tires, that is unless you have too much horsepower. I had some 17's on my Lanos and I ended up selling those and getting some 16's which are about the same diameter as the original tires. I did all my engine upgrades with the 17's and when I switched I could feel an increase in performance. The 17's may look cool but because they affect performance, they really aren't.

Smaller Tires ++++:
1) Brakes will last longer
2) The cars center of gravity will be a bit lower
3) Easier on your engine

woo · Post by **woo** » Wed Apr 27, 2005 6:00 am

the bigger sidewall of the 15's will aid in traction but will flex more during corners. Formula 1 cars have such high profile tyres on their 12's because they have virtually no suspensio, so you may be able to stiffen your suspension up mor with the 15's

AcingTeam · Post by **AcingTeam** » Wed Apr 27, 2005 2:56 pm

Why don't you go with 15's and low profile tires?

MMamdouh · Post by **MMamdouh** » Wed Apr 27, 2005 3:24 pm

go with 15" rims and 195/50/15 tires.

MMamdouh

woo · Post by **woo** » Wed Apr 27, 2005 3:27 pm

if your racing try and use 215's or bigger. My leganza has 15's with 205's on it, and from my 'experiences' youd want fatter tyres then 205's, especially for racing.

MMamdouh · Post by **MMamdouh** » Wed Apr 27, 2005 3:34 pm

if you used the same rim\tire as the leganza got (205/60/15 i suppose) then those tires will be bigger than the stock ones and will make you lose acceleration... but you will gain on top speed, i guess on autocross you need acceleration more than top spess.

MMamdouh

woo · Post by **woo** » Wed Apr 27, 2005 3:36 pm

but for racing cornering speed is more important than straight line speed....

MMamdouh · Post by **MMamdouh** » Wed Apr 27, 2005 4:03 pm

so the higher profile tires will have more wobble and cause understeer during turns... better stick with low profile ties.

MMamdouh

woo · Post by **woo** » Wed Apr 27, 2005 4:07 pm

there has to be a compromise somewhere, low profiles grip better in corners but higher profile tyres grip better in a straight lin as they can bag up

TheGreatAndPowerfulOz · Wed Apr 27, 2005 4:11 pm

I put 195/50/15 on my Lanos and it grips well in corners and seems to be good with accelleration.

woo · Post by **woo** » Wed Apr 27, 2005 4:21 pm

remember, the lanos is lighter then the forenza

MMamdouh · Post by **MMamdouh** » Wed Apr 27, 2005 4:26 pm

well... i don't think kinky got loads of torque that low profile tires will cause him problems... i guess if he managed to hold a correct line during the turn and then slam the gas on the straight he will be OK.

i also don't recommend too low profile tires as they are too much on a kinife edge but still they will help on cornering... so my recommendation is to got with low profile but not "too much" low on the profile.

MMamdouh

woo · Post by **woo** » Wed Apr 27, 2005 4:29 pm

mmamdouh wrote:well... i don't think kinky got loads of torque that low profile tires will cause him problems... i guess if he managed to hold a correct line during the turn and then slam the gas on the straight he will be OK.

i also don't recommend too low profile tires as they are too much on a kinife edge but still they will help on cornering... so my recommendation is to got with low profile but not "too much" low on the profile.

MMamdouh

SOLD!!

kinkyllama · Post by **kinkyllama** » Wed Apr 27, 2005 4:29 pm

My forenzas pretty light... ive taken alot out of it. Also the wheels im looking at are 15lbs.

But if i got with 15s it'll probably be 215/50/15 (maybe 225) if i got with 17s it'll be at least 215 (possibly alot higher)/40/17

Keep in mind race tires have extra thick sidewalls so they dont flex as much. I think im going to put my stock wheels on and go in a parking lot and see how they react.

If the profile of the tires are too low it actually hurts turning ability if the suspension isnt stiff enough.

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Need help with rim size

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