Ride quality with 18s [Archive] - SaabCentral Forums

: Ride quality with 18s


ctown95
29th August 2010, 06:49 PM
I was wonder how the ride quality changes when you upgrade to a bigger rim. I just went from stock 16 to a set of 18s. I was curious to see what other people have to say about it. The ride seams alot more harsh to me.

ivanwakeup
29th August 2010, 07:02 PM
rim size doesnt affect ride quality, tire height does. Thus, when you go up in rim you naturally pretty much have to go down in tire height. The effect is a more bumpy feeling ride.

IMO, 18 is a great size for most sedans. 19 might be where it starts to edge on being too uncomfortable for me. Going from such a small 16 inch wheel though it with naturally feel pretty bumpy until you adapt.

ctown95
29th August 2010, 07:10 PM
I see, well then maybe what im feeling isnt the rim size. Driving down the highway at 65 it kinda vibrates a lot, my 16s did this but not as bad, and at the same speed too.

Jssaab
29th August 2010, 09:39 PM
Vibration is a bent wheel bad balance or tire, nothing to do wtih the size. Gong form 16 to anything seem sharshe they are so soft a weak. If you go to 17 then 18 you will hardly notice

J-Rod
29th August 2010, 09:40 PM
Did you leave the suspension alone, or change it? Suspension lowing will make it ride more rough. I think it is probably just a matter of getting used to the thinner tires. Also, maybe they weren't balanced properly when installed or the quality of the tires isn't very good.

BTW, any pictures of the new rims? :cool:

ctown95
29th August 2010, 11:27 PM
Vibration is a bent wheel bad balance or tire, nothing to do wtih the size.
I just had them balanced at big O and the guy said they were a bit rough but they did improve a bit after I had them balanced, is there anyway to make them true again sorta speack

Did you leave the suspension alone, or change it? The suspension is stock, i havent touched it. and ill take some pics tomorrow and upload them. Also I was wondering what tire would be good for a 8.5x18 rim and the vibration could be a engine mount or anything in the engine could it?

kmbaer03
29th August 2010, 11:44 PM
Also I was wondering what tire would be good for a 8.5x18 rim and the vibration could be a engine mount or anything in the engine could it?

I just bought a set of CHs that are 18x8.5 and I think Im gonna go with 235/40/18...225/40/18 is also a fine choice.

ski
30th August 2010, 02:03 AM
do the rims you bought match the hub size of your car? If not, get hub-centric rings, they should be available from where you purchased your rims. These will make quite a difference in the vibration.

Jssaab
30th August 2010, 04:13 PM
I just had them balanced at big O and the guy said they were a bit rough but they did improve a bit after I had them balanced, is there anyway to make them true again sorta speack

The suspension is stock, i havent touched it. and ill take some pics tomorrow and upload them. Also I was wondering what tire would be good for a 8.5x18 rim and the vibration could be a engine mount or anything in the engine could it?

you need a wheel refinisher that can do straightening

ctown95
30th August 2010, 09:02 PM
I believe i have those rings, maybe one fell out when i put the rims on, ill have to check that out tomorrow. What kind of shops would have a tool like that, and how much do you think it would be? Here is a pic for you j-rod
http://i901.photobucket.com/albums/ac216/Matt_Pierce/100_0228-1.jpg
http://i901.photobucket.com/albums/ac216/Matt_Pierce/100_0229.jpg

J-Rod
30th August 2010, 11:57 PM
I believe i have those rings, maybe one fell out when i put the rims on, ill have to check that out tomorrow. What kind of shops would have a tool like that, and how much do you think it would be? Here is a pic for you j-rod
http://i901.photobucket.com/albums/ac216/Matt_Pierce/100_0228-1.jpg
http://i901.photobucket.com/albums/ac216/Matt_Pierce/100_0229.jpg

VERY nice! Those look great. Are they Borbets?

ctown95
31st August 2010, 12:16 AM
Yeah they're Borbet FS

Chris 9-5
31st August 2010, 07:03 AM
Did you leave the suspension alone, or change it? Suspension lowing will make it ride more rough. :cool:

That depends on what you use to lower it, cheapo springs = rough ride!

ragtopcav
31st August 2010, 07:07 PM
One of the useful things I have learned in my job is a lot about wheels and tyres.

An important point to remember is that it is the air pressure with the tyre chamber that supports and carries the load - not the tyre or its sidewall.

So having huge wheels with low-profile tyres [often with a smaller air chamber] will need a greater operating pressure, it is this increase in tyre pressure that usually gives the stiffer ride. Short sidewalls with high pressure gives great control but poor comfort.

Adding to Chris 9-5's comment, he's right poor springs make things worse. As they'll force the dampers to work harder still.

The trick is to get the overall balance right.

ctown95
31st August 2010, 07:55 PM
That depends on what you use to lower it, cheapo springs = rough ride!
Its on stock springs and dampers

One of the useful things I have learned in my job is a lot about wheels and tyres.

An important point to remember is that it is the air pressure with the tyre chamber that supports and carries the load - not the tyre or its sidewall.

So having huge wheels with low-profile tyres [often with a smaller air chamber] will need a greater operating pressure, it is this increase in tyre pressure that usually gives the stiffer ride. Short sidewalls with high pressure gives great control but poor comfort.

Adding to Chris 9-5's comment, he's right poor springs make things worse. As they'll force the dampers to work harder still.

The trick is to get the overall balance right.

So make sure the tire pressure is correct