Do taller (larger series) tires give a worse ride? - Team Camaro Tech
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post #1 of 12 (permalink) Old Dec 2nd, 06, 10:33 AM Thread Starter
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Do taller (larger series) tires give a worse ride?

Hey folks - Most popular 15 inch tires run a 60 series for passenger cars. I'd like to run a taller tire to fill the wheelhouse space in the rear of my 67 without running a very wide tire...I'd like to ideally run a 235. Would a 235-70 series tire give me a harsher ride than a 235-60 series? I really don't care about performance handling - I really want the car to be comfortable to drive (ride in). Most SUV's run a 70 series or so as compared to a car.....and that leads me to believe the answer to my question is ...YES.
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post #2 of 12 (permalink) Old Dec 2nd, 06, 10:41 AM
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Re: Do taller (larger series) tires give a worse ride?

The only difference is that the taller tire may change the speedometer readings not other problems should exist. At the top of this forum, link are available to help with the different tire sizes etc..

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post #3 of 12 (permalink) Old Dec 2nd, 06, 10:44 AM
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Re: Do taller (larger series) tires give a worse ride?

I don't think that there would be much difference between a 60-series and a 70-series tire on 15 inch rims....

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post #4 of 12 (permalink) Old Dec 2nd, 06, 11:04 AM
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Re: Do taller (larger series) tires give a worse ride?

The problem comes in defining handling.

A bigger profile number (ex. 50=> 60=> 70=> 75) makes the overall height of the tire taller which does effect ride quality (less side wall associated with a small cross sectional number means a stiffer harsher ride) and by going taller you increase your braking distance by a couple of feet as there is more force to over come with the longer torque arm (radius) of the taller tire. Taller tires give better mileage (especially when pumped up hard), but reduce the cars ability to accelerate as it effectively lowers the numerical ratio of the rear gears. All of these factors effect the cars handling.
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post #5 of 12 (permalink) Old Dec 2nd, 06, 01:18 PM
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Re: Do taller (larger series) tires give a worse ride?

Tire 1 - 225/60R15
Section Width: 8.85 in 225 mm

Rim Diameter: 15 in 381 mm

Rim Width Range: 6 - 8 in

Overall Diameter: 25.62 in 650.74 mm

Sidewall Height: 5.31 in 134.87 mm

Radius: 12.81 in 325.37 mm

Circumference: 80.48 in 2044.1 mm

Revs per Mile: 811.8
.................................................. .................................................. ...

Tire 2 - 225/70R15 >Search Tires
Section Width: 8.85 in 225 mm

Rim Diameter: 15 in 381 mm

Rim Width Range: 6 - 8 in

Overall Diameter: 27.40 in 695.96 mm

Sidewall Height: 6.20 in 157.48 mm

Radius: 13.70 in 347.98 mm

Circumference: 86.07 in 2186.1 mm

Revs per Mile: 759.1

.................................................. .................................................. ....


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post #6 of 12 (permalink) Old Dec 3rd, 06, 08:56 AM Thread Starter
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Re: Do taller (larger series) tires give a worse ride?

Big Dave - Are you saying the harsher ride is typical of a smaller series number (60 as oppose dto 70) with less sidewall?
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post #7 of 12 (permalink) Old Dec 3rd, 06, 09:15 AM
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Re: Do taller (larger series) tires give a worse ride?

In theory the taller the wheel/tire combo is the smoother it's ride. To put it in perspective take an old tool box or cart with small 2" wheels and push it around on a blacktop driveway. Now go get a cart with taller 6" wheels and push it around.

That said in car wheels and tires there are a lot of things to consider. Much of this is just restating what has been said... A 70 series sidewall will cushion better than a 50 series tire of the same construction. The 50 series tire will handle (corner) better though than the 70 series. An alloy wheel will dampen better than a steel wheel.

So you need to look at exactly what you want out of the tire. You indeed can run a 28" tall wheel/tire if you want to fill the wheel well. Other things to consider are how the taller tire fits in the wheel well (turning radius as well as rubbing) and how the taller tire effects performance and fuel economy (it changes your effective final gear ratio).

...Dennis

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post #8 of 12 (permalink) Old Dec 3rd, 06, 09:16 AM
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Re: Do taller (larger series) tires give a worse ride?

Quote:
Originally Posted by topspin View Post
Big Dave - Are you saying the harsher ride is typical of a smaller series number (60 as oppose to 70) with less sidewall?
That would be correct IMO, and without speaking for Dave believe that is what he is saying...

...Dennis

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post #9 of 12 (permalink) Old Dec 3rd, 06, 09:57 AM
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Re: Do taller (larger series) tires give a worse ride?

Yup! The cord angle in the 45-50 series tires is much sharper than the same cord used to reinforce a 70 to 75 series tire resulting in less flex (that is why we have rubber tires to cushion the road). Less flex equals harsher ride (more of road surface motion transmitted to the chassis). Less flex equals better handling as the tread stays flat on the pavement were it can grip the road.

Real big down side to rubber band tires (35-45 cross section range) is that there isn't enough side wall to protect the rim from impact with pot holes and rough pavement. Net result is bent rims and cut tires, unless you put the car on a trailer or drive at no more than twenty miles an hour.


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post #10 of 12 (permalink) Old Dec 3rd, 06, 10:13 AM
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Re: Do taller (larger series) tires give a worse ride?

Quote:
Originally Posted by Larger Dave View Post
Real big down side to rubber band tires (35-45 cross section range) is that there isn't enough side wall to protect the rim from impact with pot holes and rough pavement. Net result is bent rims and cut tires, unless you put the car on a trailer or drive at no more than twenty miles an hour.
Larger Dave
I think this is a bit exagerated Dave. I've been running 45 series on 17's for years on my Camaro and it doesn't know what a trailer is. My Dad has a 2004 Maxima with 17" or 18" wheels with 35 or 45 series sidewalls from the factory and he drives that thing everywhere with no adverse issues from pot holes either.

The point is well taken though... I do drive to avoid pot holes and any other obsticles in the road way. I have hit some though, they do sneak up on you sometimes.

...Dennis

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post #11 of 12 (permalink) Old Dec 3rd, 06, 01:00 PM
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Re: Do taller (larger series) tires give a worse ride?

As far as sidewall height goes a number that gets thrown around alot is 4" of sidewall. In many people's opinion you need at least 4" of sidewall for the best handling and a decent ride without bending wheels all over the place. Now with that said I totally agree with whats already been said in that the taller the sidewall the better the ride at the sacrifice of some handling. Keep in mind what Dennis said about a 28" tall tire. You won't find many cars around here, www.pro-touring.com , or www.lateral-g.net with tires taller than that.

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post #12 of 12 (permalink) Old Dec 3rd, 06, 02:06 PM
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Re: Do taller (larger series) tires give a worse ride?

The bottom line is that if you have a larger rim with a bigger profile tire, the more smooth the ride will be. If you have a large rim ie, 16" or 17" diameter with a low profile tire ie, 45-50 series the harsher your ride will be in general depending also on the type of suspension you have. The drawback to a higher series tire is that you lose the handling capabilities due to more give in the sidewall of the tire (as already stated above).

I used to have 16" rims with a 50 series tires on my IROC which gave me a real harsh ride, but better handling due to the stiffness of the sidewall. I decided to go with 15" rims and a bigger series tire which gave me a more comfortable ride.

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