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Author Topic:   Wides tires for 16x7.5 rims?
ehwang
unregistered
posted February 04, 2000 05:35 PM           Edit/Delete Message Reply w/Quote
What are the widest tires that i can put on 16x7.5 rims? Wider tires w/ a lower profile will help cornering, but will it reduce acceleration? im currently using 225/60r16's on. any suggestions? thanks!
-eric

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David
unregistered
posted February 06, 2000 05:40 AM           Edit/Delete Message Reply w/Quote
EN
There is alot more to the equation than how wide can I go on a 7.5" wheel. For what it's worth a 7.5" wide wheel has a decent amount of flexibility. By the numbers - a section width of 275mm will fit on a 7.5" wheel, a bit of a push, but again by the numbers it calculates to fit. What is equaly (mabey more) important is the tires over all hieght. A 225/60R16 is 26.63" tall, a rather tall 16" performance tire. Usually reserved for larger sedans & minivans.
Again -just by the numbers. If you went to the widest tire that would fit on your 7.5" wheels:
275/60R16 = 28.98" Overall Diameter
275/50R16 = 26.85" OD

The next factor you must consider is in order to maintain the hieght you are increasing the width of the tire, will the wider tire fit on the vehicle with out posing clearance problems with things like the fender well, shocks/struts, control arms, etc., etc., etc.
You must look at the overall & complete picture. For the best recomendation you need to include the yr/mk/model of the vehicle and explain what it is you are trying to accomplish. If wider tire is main goal you may have to consider going to a 17" wheel in order to maintain close OD and avoid any clearance issues. Post the additional information and I'm sure we can reply with more specific and usable info.
Hope it helps.

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ehwang
unregistered
posted February 06, 2000 07:23 AM           Edit/Delete Message Reply w/Quote
Well i have a '96 chevy monte carlo z34. i dont think there's a big clearance problem fender wise. i just wanted to have a little lower profile, but i think a 225/50r16 would leave too big of a gap between the tire and wheel well. I was hoping to go with a wider tire with a lower profile to increase handling with more tire on the road and less profile for cornering. im thinking maybe a 245/50r16? what OD will that give me? thx again.
-eric

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David
unregistered
posted February 07, 2000 06:04 AM           Edit/Delete Message Reply w/Quote
EH
OD for the 245/50R16 is 25.64". Just at 1" shorter. With vehicle information provided you have two options you can do in order to accomplish your desired results.
The first is to move to a 17" wheel/tire package as I mentioned previously. The second would be to pursue a computer re-calibration. Check with a Chvy dealer for price info. The police edition comes with / uses a 215/65R15 which is 26.00" OD so they do have a set up for the shorter diameter tire.
Probably the least expensive option of the two. But with a 1" dif. in OD you will still have extra "daylight" in your fender well unless you lower the car some as well - more $$.!
Keep one other thing in mind. Your description of the results - "wider tire with lower profile to increase handling with more tire on the road and less profile for cornering" All correct except for the more tire on the road. Handling will increase/improve because of the "less" or lower sidewall hieght "profile", though the amount of tire "on the road" will not increase. The contact patch - the amount of tire that touch's the road merely changes shape. It becomes wider and shorter. In measured area the is no additional size of the contact patch or rubber on the road. Your handling improvements are a result of the wider patch keeping more rubber on the road in cornering and the shorter sidewall hieght allowing less flex or roll. Another variable that will effect this is performance(speed) rating and tire construction which contribute to the amount flex in the sidewall and tread compound for the amount of "grip". But this is another story.
First figure out if it's wheels or computer you want to change.

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