: need a catera tyre recommendation: 245/40x18



wamanning
01-26-10, 10:49 AM
as you can see by the tyre sizes, i'm running aftermarke 18x8 rims...the problem is the tyres i have now exacerbate my catera's tramlining.

so i'm curious if anyone else is running wider aftermarket rims that is HAPPY w/ the tyres you are running (i.e., minimal propensity to tramline/wander).

i just spent $1000 on a boat-load of new front-suspension bits and computerize alignment to try to improve the situation, and it's slightly better...so now i'm thinking to upgrade my tyres.

CateraMV6
01-26-10, 01:11 PM
Here you go my friend...

These are 18x7.5 with 245/45-18 Continental Rubber, < Sticky summer tires. Soon I will be upgrading to a 18x9.5 Rears with 275 Rubber.
http://i870.photobucket.com/albums/ab263/MV6Catera/BEAUTY%20Shots/DSC04020.jpg
http://i870.photobucket.com/albums/ab263/MV6Catera/BEAUTY%20Shots/DSC04040.jpg

These are witner 18x8 with 245/45-17s Blizzak.
http://i109.photobucket.com/albums/n50/CateraMV6/Blizzak%20WS-50/IMG00182.jpg

Summer AutoX tires... 245/45-17s on 17x7.5 rims
http://i109.photobucket.com/albums/n50/CateraMV6/BBS%20MODA%20R1/DSC03089.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/BBS%20MODA%20R1/DSC03087.jpg

wamanning
01-26-10, 01:15 PM
how are your phatty rims/tyres and tramlining w/ your catizzle?!

mine got really bad in nov/dec before i had the work done, it still does it a little...and honestly is quite irritating!!!

elvin315
01-27-10, 05:52 PM
i just spent $1000 on a boat-load of new front-suspension bits and computerize alignment to try to improve the situation, and it's slightly better...so now i'm thinking to upgrade my tyres.

The tramlining problem is likely the increased tire width. Since our cars already tend to ride on the inside edges of the tires (too much negative camber) using wider tires moves the contact patch further inward. Among the boat load of stuff did you include new camber bolts (http://store.summitracing.com/partdetail.asp?part=IEC-I-81260&FROM=MG)? They help tip the tires outward by adding more positive camber.

Just out of curiosity could you list your suspension upgrades and give us your opinion? Thanks.

wamanning
01-27-10, 06:07 PM
The problem is likely the increased width. Since our cars already tend to ride on the inside edges of the tires (too much negative camber) using wider tires moves the contact patch inward. Among the boat load of stuff did you include new camber bolts (http://store.summitracing.com/partdetail.asp?part=IEC-I-81260&FROM=MG)? They help tip the tires outward by adding more positive camber.

Just out of curiosity could you list your suspension upgrades and give us your opinion? Thanks.

here's what i had installed & done:
- L/R lower control arm assembly (includes control-arm and both horiz/vert bushings and lower ball joint)
- L/R "sway bar links" (i think this refers to the "stabilizer bar links" using GM parlance)
- digital 4-wheel alignment on some sort of high-tech gizmo

overall, the tramlining is slightly improved. although i cant be sure if the parts had anything to do with it, or if the alignment alone would have done the same. honestly, i'm quite disappointed that it's not better.

i need to look into these adjustable camber bolts. doing some research it seems that negative camber aggravates tramlining, so you'd want to move the camber value towards the plus side.

the catera's factory camber spec is -1.15deg to +1.35deg with -0.60deg being preferred. mine is definitely towards the far-end of the negative range, with values of -0.83deg and -0.96deg *after* alignment.

is that camber bolt in the link you gave the exact fitment for the catera?

Ingalls Engineering Fastcam Camber Adjusting Bolts

This part is sold one per wheel, it replaces the strut to spindle mounting bolts. Fits vehicles with 14mm OEM strut to spindle mounting bolts only.

http://static.summitracing.com/global/images/prod/large/iec-i-81260_w.jpg

wamanning
01-27-10, 06:18 PM
yep, thats the right fitment...i think i'm gonna order some!

http://www.tirerack.com/suspension/suspension.jsp?&make=Ingalls&model=FastCam%20Bolt&group=FastCam%20Bolt&autoMake=Cadillac&autoModel=Catera%20Sport&autoYear=2001&autoModClar=&partNum=NI81260&perfCode=S&NI81260_Qty=2

ondale
01-28-10, 10:33 AM
CateraMV6, want to confirm those specs, 245/45-18 on those rims (the Astra XR). If you recall, I bought a set on eBay late last year (thanks to your keen eye). With Spring around the corner, I am going to start getting it ready. I thought I had to go with 245/40-18, (lower profile 40 for clearance since I am going from the stock 17" to those 18"). I haven't done any mods on the suspensions. So please confirm that you are using 45 profile without issues. Thanks

wamanning
01-28-10, 10:42 AM
So please confirm that you are using 45 profile without issues. Thanks

i am using the slightly lower profile 40-series 245/40x18 -- purely for aesthetics. i do not foresee any problems using a 45-series profile w/ 18x8 rims!

CateraMV6
01-28-10, 08:25 PM
CateraMV6, want to confirm those specs, 245/45-18 on those rims (the Astra XR). If you recall, I bought a set on eBay late last year (thanks to your keen eye). With Spring around the corner, I am going to start getting it ready. I thought I had to go with 245/40-18, (lower profile 40 for clearance since I am going from the stock 17" to those 18"). I haven't done any mods on the suspensions. So please confirm that you are using 45 profile without issues. Thanks

Wow, why did I say that, I meant 245/40-18s, the 45 is too tall and will either rub or screw too much with your speedo...

Also the 40 series is almost dead on with the OEM tire diameter.

The Astra wheels are 18x7.5, and the 245s fit just right on there... a 8" Rim will stretch the tire a bit and make it look more fat.

There is a wheel widening spot here in Michigan that can stretch my rear wheels to a 18x9.5 and then I will be upgrading to a 275 tire...

CateraMV6
01-28-10, 08:34 PM
Here is a 225/40-18s vs 245/40-18s on the same wheels.

http://i109.photobucket.com/albums/n50/CateraMV6/ComparisonSidebySide.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/DSC03272-1.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/utf-8BSU1HMDA1NjQuanBn.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/DSC00944.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/DSC03623.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/DSC03624.jpg

http://i109.photobucket.com/albums/n50/CateraMV6/DSC03630.jpg

Jea3cd
08-06-10, 11:54 PM
What wheel offset are you guys using?

BrandonW
08-07-10, 04:18 AM
Here is a 225/40-18s vs 245/40-18s on the same wheels.

http://i109.photobucket.com/albums/n50/CateraMV6/ComparisonSidebySide.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/DSC03272-1.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/utf-8BSU1HMDA1NjQuanBn.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/DSC00944.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/DSC03623.jpg
http://i109.photobucket.com/albums/n50/CateraMV6/DSC03624.jpg

http://i109.photobucket.com/albums/n50/CateraMV6/DSC03630.jpg



Nice pics, but personally I would go in for the 225/40-18s

wamanning
08-09-10, 11:30 AM
iirc the factory offset is like 42mm, but i was running 35mm on my 18x8s...and with 245/40-18 rubber, it looked PERFECT imo. the lower offset rims tend to push the wheel further out toward the fender.

...
What wheel offset are you guys using?