275's, problems with them

[canadian_hustla]

Ok so i recently bought a newer car, 95 mustang. It came with aftermarket 17's with 275 rims. One thing i have noticed is that the car is VERY hard to handle, it seems to stick to every carving in the road. For example on roads where trucks are common, the car will pull right. However on places like deerfoot, the car will pull left and right. It seems like I am also fighting to keep it in between the tire tracks on the right and roughed up road on the left

is this normal?

oh yeah and as a result of this, handling is shit

[Redlyne_mr2]

Yeah lower profile tires do not absorb the bumps like a higher profile tire and are succeptable to bump steer.

[FiveFreshFish]

Tires have the most direct influence on tramlining because they are the part of the vehicle that comes into contact with the road (and the longitudinal ruts and/or grooves that exist there). Unfortunately anything that increases a high performance tire's responsiveness also increases its willingness to tramline.

High performance tires with short sidewalls that develop lots of cornering power at lower slip angles will be more susceptible to tramlining than standard All-Season passenger tires that develop less cornering force until their slip angle increases. A wider treaded tire will encounter more longitudinal ruts and/or grooves in the road than a narrow treaded tire. A tire with large tread blocks that transmits the driver's input to the road with great precision will also transmit the road's imperfections back to the vehicle's suspension. And because tires become more responsive as their tread depth wears away (which is why tires are shaved for competition and track use), a tire will become more likely to tramline as it wears.

http://www.tirerack.com/tires/tirete....jsp?techid=47

[canadian_hustla]

bump

I have heard of bump steer kits that you can buy off ebay, do these actually work?

[Moe Man]

its called road crown, no way to stop it. the wider the tires are the worse it gets.

[rony_espana]

I always wondered what that was, I thought it was something with my truck, I've got some 275/45/20 and it just pulls left and right especially on deerfoot north, getting towards 16th Ave. I got my wheels balanced, rotated, filled to the right psi etc...and there was absolutely no change.

[sleeperstang]

Nothing you can do about the car dancing all over the road, you kinda get used to it after awhile and you'll develop a second nature to correct the car automatically...kinda like learning how to tightrope

Common problem areas in calgary include:
Barlow, Deerfoot between 16th and memorial, 16th Ave and basically any other road with lots of traffic.

As for the handling problems try adjusting your camber settings before investing in a bumpsteer kit.

[FatboyTheHungry]

Yep, the wider the tires, the more they will track the imperfections in the road.

[@lchy]

also, if your offset is wrong, or different than factory your develop bumpsteer and an improper scrub radius. It is going to be difficult to fix, but making sure your camber/caster and toe are all in spec may help.

[legendboy]

hmm i figured something like this as my supra has the same problem

[benyl]

Also, any tires with extremely stiff sidewalls will react this way. The stock tires on my car are 225, but feel like they are made from solid steel. My tracks all over uneven roads.

[Mr_ET]

same thing on my civic with 17's 40 sidewall and 205mm wide on stock suspension no power steering doesnt help either

[b_t]

with my 225s on my 18s this happens too. I like it, it reminds me that I am driving a perform... err, sportyish car

[al-ti2d]

Originally posted by b_t
with my 225s on my 18s this happens too. I like it, it reminds me that I am driving a perform... err, sportyish car

lol nice save

[canadian_hustla]

alright well thanks for the answers, i guess i will just have to live with it

or sell them

[GTS Jeff]

Originally posted by canadian_hustla
alright well thanks for the answers, i guess i will just have to live with it

or sell them

Don't bother with the bumpsteer kit, whatever that is...because bumpsteer is different from tramlining. Bump steer is what happens when your suspension geometry is messed; when you lower a car, the front control arms will point up. As a result, when you hit bumps while cornering, the bump will throw the car "off." This has nothing to do with tramlining.

Also, I noticed that you said your car doesn't handle well. Buddy, the 275 tires aren't the problem (they actually help handling,) it's the car itself. I'm sure you can help it out with some upgrades, but c'mon Mustangs are notorious for poor handling.

[AllGoNoShow]

Don't forget if your running say 235's up front and 285's out back, you will be alot worse off then just runnign 255's all the way around

[canadian_hustla]

Originally posted by GTS Jeff
Don't bother with the bumpsteer kit, whatever that is...because bumpsteer is different from tramlining. Bump steer is what happens when your suspension geometry is messed; when you lower a car, the front control arms will point up. As a result, when you hit bumps while cornering, the bump will throw the car "off." This has nothing to do with tramlining.

Also, I noticed that you said your car doesn't handle well. Buddy, the 275 tires aren't the problem (they actually help handling,) it's the car itself. I'm sure you can help it out with some upgrades, but c'mon Mustangs are notorious for poor handling.

LOL

mustang hating aside, I disagree with the handling comment in that I have winter tires for it (pure stock), and the bump steer / tramlining / whatever other names are for it go away completely.

I guess one could say that the car feels EVERYTHING that i go over, and plus it does pull and shake a lot with the summer tires on.. mind you, they stick out half an inch outside my wheel wells so they are definately too big

its ok, i will get used to it - but thanks for the help

- on a side note, my 82 beamer handles FAR better than my mustang - the mustang is absolute garbage on turns i.. it feels like it is going to flip haha

so you are wrong, but then you are sort of right

[GTS Jeff]

Originally posted by canadian_hustla


LOL

mustang hating aside, I disagree with the handling comment in that I have winter tires for it (pure stock), and the bump steer / tramlining / whatever other names are for it go away completely.

I guess one could say that the car feels EVERYTHING that i go over, and plus it does pull and shake a lot with the summer tires on.. mind you, they stick out half an inch outside my wheel wells so they are definately too big

its ok, i will get used to it - but thanks for the help

- on a side note, my 82 beamer handles FAR better than my mustang - the mustang is absolute garbage on turns i.. it feels like it is going to flip haha

so you are wrong, but then you are sort of right

Re-read my post. Bump steer and tramlining are two different things. You are experiencing tram lining, NOT bump steer. The reason your "problems" went away with winter tires is because your winter tires have a softer sidewall, which is worse for handling. Tramlining is a side effect of better handling.

[canadian_hustla]

^

I see what you are saying,

I took her out for a drive today with the summers on, and the car can literally turn on a dime. Sure there is vibration and tram lining at high speeds, but it is a tradeoff for superb handling

maybe i will keep them after all

thanks for your help Jeff