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Author Topic: Sorry, stupid question  (Read 5299 times)
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biovirus
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« on: December 30, 2003, 10:42:11 PM »

I am sorry if this will sound to you guys as a stupid question, but after 30+ years of driving many different cars and trucks all over the world I never thought much about tires, unless I punch them.
16", 17', 20" - this is all gibberish to me. The tires can differ as I understand in internal size (external size must remain the same, right? Otherwise all the gear-powertrain rations will go out of wack + odometer readings will be different...
I know they can be wider (better grip?), better materials, etc. But what is a significance of the internal diameter? Say 16" vs. 17" or 20"? The bigger the internal diameter, the "shallower" the tire, right? What is the advantage? Savings in weight?

Thanks,

Alex.

 
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aztek_styln
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« Reply #1 on: December 31, 2003, 05:51:41 AM »

From what I have learned in looking into getting into trying to buy rims and low profile tires. The inner size diffrent just effects your drive. If you want bigger tires you can get them but they still have to be able to fit into the wheel well right and the only real way of not effecting the tire size to much is to get low profile tires. The only problem you have with that is that in the suspension for the car that count your tires in for it so the more you take away from the tire the less suspension you have so you will have a bumper ride. This is just what I have kinda gotten in looking for new tires.  
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AZteXtasy
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« Reply #2 on: December 31, 2003, 09:15:17 AM »

Bio....
No such thing as stupid questions, they only lead to greater inteligence!!!!!

The facory wheels and tires are designed with a specific size and weight  that allows the vehicle to function properly

It is important when changing tires or wheel that they remain within the factory paramiters

Example
Factory 16" [rim size at bead of tire] 215x70x16 overall outer diameter 28.+"
If you move up to a 17" wheel the tire size would change to a 235x55x17 to remain near the 28"oa dia
if you move up to a 20" rim the tire may go in the 255x40-50 to remain near the OD

When you go to the bigger tire the tire has to be rated for capacity so it generally becomes wider and requires a wider wheel, but because of the bigger rim, yes the tire sidewall height is smaller [distance between rim and outer tire]

The bigger tire is not a weight saving issues as the bigger wheel, will weigh more than the factory combo

As long as you stay within 1/2" of overall diameter of the tire, it does not greatly effect vehicle performance [speedo, fuel etc]
but, bigger and heavier wheel/tire combo can create braking issues, different road grip situations, and possible rubbing within the fender wells,

So it is important to pick the correct sizes and buy from a local tire retailer, where you have some hands on, personal relationship incase you develop issues
RC
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« Reply #3 on: December 31, 2003, 10:36:55 AM »

Bio
The only stupid question in this forum is the one you don't ask!!

Jack

:usa:
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Jack Egan
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peterbright
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« Reply #4 on: December 31, 2003, 03:02:41 PM »

Most people go for the larger wheel like a 20" one for the looks of them...not because there is any performance advantage.  A wider tire will give you more grip.
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biovirus
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« Reply #5 on: December 31, 2003, 08:34:00 PM »

Ok, now I understand that there is no perfomance issues with larger rims.
I was thinking of all possible scenarios and all I was able to come up with is that 20" rims will be helpful if the tire blows up.

Thanks, everybody.

Alex.
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rylowe
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« Reply #6 on: January 02, 2004, 11:16:48 PM »

Good answer Aztextacy. As for me; I bought 20" rims for the looks. The better grip was an added bonus. Bio you do have a good point about the biiger rims paying off if the tire blows up. The downside of that is that the 20's cost alot more to replace after you ruin them by driving on them with no tire.  :blol:  I would recommend 20's cause they just look cool, but its all about your personal prefference.
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peterbright
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« Reply #7 on: January 03, 2004, 09:43:06 AM »

Did you notice much difference in ride when you switched?  Yes they look great!
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rylowe
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« Reply #8 on: January 03, 2004, 07:22:38 PM »

you can feel the bumps a little more, but it still rides great. I still get compliments on the smooth ride from everyone who rides in it.  
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outdoors
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« Reply #9 on: January 05, 2004, 09:30:25 PM »

When you speak about Grip as it relates to tire width, I think that it is important to also talk about the road conditions.

Dry Pavement - wider, taller OD tires have more square inches touching the road giving a better road grip

Wet Pavement - Wider, Taller OD tires may be more prone to hydroplane because water is not shed to the sides as easily.

Snowy Road - Snow packs under the tire instead of being pushed aside

Sandy - Wide tires float on top of the sand & do not sink in and become buried

Icy Road - Need Chains!
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tanktek
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« Reply #10 on: January 06, 2004, 10:27:21 AM »

perfectly said, outdoors!
wider tires definately help out on a nice dry road with the gripping. but the minute mother nature throws some water or snow down you have to be a little cautious. I guess it all depend on your climate if you get more good wheather than bad.
I know I was regretting the low profile wide tires the day before when we got stuck with a bunch of snow. It felt like I was driving with drag slicks cause I couldnt get any traction whatsoever with the ice on the roads. Thats why Im ordering an extra set of tires for the snow this weekend.  B)  
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Elisha  2005/06/07 Rally organizer
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greg_foulks
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« Reply #11 on: January 06, 2004, 03:01:39 PM »

I just put on a set of 15in Michelin Harmony Tires. They are great! Nice ride and the traction is awesome!
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AZteXtasy
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« Reply #12 on: January 06, 2004, 05:47:19 PM »

More benificial info from outdoors, thanks
Also
When you upgrade to bigger is better for looks,,, keep your factory tires and wheels and swap them back on, for the winter [unless you live in pathetic land, where it dosen't SNOW] :ignore:

Keeps your saftey and traction and keeps your DUBS in good condition :lolu:  
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MY Aztek Purchases
2001 GT 1SC    > MSRP $27,245 > Paid $18,995
2003 1SC Rally > MSRP $27,845 > Paid $19,500
2004 1SC AWD > MSRP $31,760 > Paid $22,000
Cape Cod, MA[/i][/size]
biovirus
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« Reply #13 on: January 07, 2004, 02:12:58 AM »

Funny that you said that. These are the words from my favouritre song (happens to be in French) L'Orage (Storm) by G. Brassense.
"Des pays imbécil´s où jamais il ne pleut.." - in the stupid lands where it never rains...
I live in Nevada, and it never rains here, however I often drive over the Donner Lake pass to CA and in the winter if you do not want CHP to make you put the chains, you need 4WD. That is why my Aztek is AWD.

Cheers.
Alex.
 
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peterbright
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« Reply #14 on: January 07, 2004, 06:45:03 AM »

Seems that S*** land  :lolu: is the pathetic land.
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