275s are little... lets go nuts.
12-25-2008, 09:11 PM
#1
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275s are little... lets go nuts. so I have the stock chromes on my 05 V. Theyre wrapped in 275s, but in first gear when the engine hits the powerband around 4500 I can feel the rear tires starting to let go - which is totally unacceptable. 
So its time to look at 295s or even 305s.
So my question, I know a few guys have had thier stockers widened, what kind of clearance do you have, how much was the rim widened, has anyone tried 305s or 315s? Im looking for no rubbing issues obviously, but I want the absolute MAX amount of traction without having to cut into things. (honestly Im not above getting a puller and bringing in the wheel tubs about an inch worst case or rolling fender lips..)
Let me know guys!
So its time to look at 295s or even 305s.So my question, I know a few guys have had thier stockers widened, what kind of clearance do you have, how much was the rim widened, has anyone tried 305s or 315s? Im looking for no rubbing issues obviously, but I want the absolute MAX amount of traction without having to cut into things. (honestly Im not above getting a puller and bringing in the wheel tubs about an inch worst case or rolling fender lips..)
Let me know guys!
12-25-2008, 09:22 PM
#2
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From what I've read, the most you can go without modding the suspension or having your wheels stick out past the wheel wells is a 9.25" rim.
12-25-2008, 11:58 PM
#3
Tire Clearance Stock rims widened to 9.5" require a 5mm spacer in order to adequately clear suspension links and with a 275/40, do not extend outside the fender well.
Personally, I think that a 275/40 on a 9.5" rim will have better traction than a 275/40 on a stock rim. Tire compounds and sidewall design also are governing factors.
Some folks have mounted 295s on stock rims (do a search here or on the Cadillac boards), but the concern here is that the rim width will be less than the tread width/contact patch which may be o.k. for drag slicks, but not for handling.
Personally, I think that a 275/40 on a 9.5" rim will have better traction than a 275/40 on a stock rim. Tire compounds and sidewall design also are governing factors.
Some folks have mounted 295s on stock rims (do a search here or on the Cadillac boards), but the concern here is that the rim width will be less than the tread width/contact patch which may be o.k. for drag slicks, but not for handling.
12-27-2008, 01:05 PM
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Stock rims widened to 9.5" require a 5mm spacer in order to adequately clear suspension links and with a 275/40, do not extend outside the fender well.
Personally, I think that a 275/40 on a 9.5" rim will have better traction than a 275/40 on a stock rim. Tire compounds and sidewall design also are governing factors.
Some folks have mounted 295s on stock rims (do a search here or on the Cadillac boards), but the concern here is that the rim width will be less than the tread width/contact patch which may be o.k. for drag slicks, but not for handling.
Personally, I think that a 275/40 on a 9.5" rim will have better traction than a 275/40 on a stock rim. Tire compounds and sidewall design also are governing factors.
Some folks have mounted 295s on stock rims (do a search here or on the Cadillac boards), but the concern here is that the rim width will be less than the tread width/contact patch which may be o.k. for drag slicks, but not for handling.
12-27-2008, 03:08 PM
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i would also like to have wider rear wheels as i have some traction issues also. I don't mind having to modify the suspension and widening the stock rims, i just need to know what is required to fit wider wheels.
01-02-2009, 12:33 PM
#7
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Alright so what Ive surmized from the two boards is that 295s are possible, but the rim has to be widened inwards towards the IRS. The shock becomes a limiting factor at 295, but Im going to lift the car up when I get back home and see what or where I can relocate the rear shocks to. Id love to be able to say Im running 315s with no clearance or rubbing issues and without slapping on those goofy looking fender flares.
(My goal is to look as stock as possible, I dont want to have to ignore every jackass with a rice rocket)
(My goal is to look as stock as possible, I dont want to have to ignore every jackass with a rice rocket)
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01-02-2009, 01:02 PM
#9
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295s on a CCW-built 10" rim barely lip out past the fender. The widest I have seen the stock rims widened to is 9.25", although Luna on the other board may have gone wider. A 295 on a less than 9.50" is not ideal. Tubbing it is the better route to go if you do not want the flares, but the flares look damn nice when done right:
01-03-2009, 08:23 AM
#12
9.5 In my post above, the rear rim and spacer requirements for 9 1/2" rims are outlined. I've had them on the car for over a year with 275/40s with no problems whatsoever.
Shock clearance is not the issue, the forward suspension link is and that's what the spacers alleviate.
Shock clearance is not the issue, the forward suspension link is and that's what the spacers alleviate.
01-03-2009, 12:21 PM
#13
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After reading your note, I had a couple of questions. I planned to have my stock wheels widened to better fit 275/40's on the rear. The company I was looking at to do the work, Weld Craft Wheels in Michigan, widens wheels in 1/2" increments. I measured up my stock existing 8.5" 245/45 set-up to see if 9.5's would clear the trailing arms with spacers and it didn't look like it would clear the trailing arms going a full 1" wider. It really doesn't seem like a 1/2" would be worth the trouble.
I have read that others have run 9.5" 275/40 set-ups with 5mm spacers in the past; I have a couple of questions about your set-up if you have a minute:
1. are you running a aftermarket wheel with different backspacing than stock?
2. with 5mm wheel hub spacer, did you feel OK with the stock wheel stud length?
3. who did you get spacers from; it looked like I would have to have them machined myself?
4. if you had your wheels widened, who did them for you?
thanks
I have read that others have run 9.5" 275/40 set-ups with 5mm spacers in the past; I have a couple of questions about your set-up if you have a minute:
1. are you running a aftermarket wheel with different backspacing than stock?
2. with 5mm wheel hub spacer, did you feel OK with the stock wheel stud length?
3. who did you get spacers from; it looked like I would have to have them machined myself?
4. if you had your wheels widened, who did them for you?
thanks
01-03-2009, 01:08 PM
#14
9.5 Wheels My wheels are stock wheels, widened to 9 1/2" by Weldcraft.
The thread purchase on the rear studs (with the spacers installed) is a little less than 6 turns. On my car, the rear studs are longer than the front, as the fronts will only engage about 4 turns. I have new front studs that are longer but have been procrastinating on their installation.
Fred Goeske @ WheelAdapter.com made billet spacers in the 6x115 pattern that are 5mm (~.200") thick.
This gives about 1/4" clearance from the suspension link (with a 275/40 PS2).
The thread purchase on the rear studs (with the spacers installed) is a little less than 6 turns. On my car, the rear studs are longer than the front, as the fronts will only engage about 4 turns. I have new front studs that are longer but have been procrastinating on their installation.
Fred Goeske @ WheelAdapter.com made billet spacers in the 6x115 pattern that are 5mm (~.200") thick.
This gives about 1/4" clearance from the suspension link (with a 275/40 PS2).
Last edited by scatillac; 02-21-2009 at 09:41 AM. Reason: Added info.
01-04-2009, 07:11 PM
#16
why would u widen your stock wheels to run 275s or 285s they fit perfect with no rubbing or hitting what so ever. The stock wheels I sold awhile back had 285s and I had no problem and no poke of tire from fender.
this is with 295's on the 9" Team Dynamic Racing wheels
this is with 295's on the 9" Team Dynamic Racing wheels
01-04-2009, 08:10 PM
#17
Rim/Tire Width Concerns I went wider on my rims to keep the rim width well within the tire manufacturer's (Michelin) specs instead of a marginal (too narrow) situation.
Tire turning response is better and cornering is more stable (and predictable) when the carcass isn't pinched in at the rim area.
Tire wear is also better because the contact patch is evenly spread across the tire's surface with the wider rim.
Tire turning response is better and cornering is more stable (and predictable) when the carcass isn't pinched in at the rim area.
Tire wear is also better because the contact patch is evenly spread across the tire's surface with the wider rim.
01-04-2009, 08:40 PM
#18
I went wider on my rims to keep the rim width well within the tire manufacturer's (Michelin) specs instead of a marginal (too narrow) situation.
Tire turning response is better and cornering is more stable (and predictable) when the carcass isn't pinched in at the rim area.
Tire wear is also better because the contact patch is evenly spread across the tire's surface with the wider rim.
Tire turning response is better and cornering is more stable (and predictable) when the carcass isn't pinched in at the rim area.
Tire wear is also better because the contact patch is evenly spread across the tire's surface with the wider rim.
01-04-2009, 10:52 PM
#19
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Sorry capown, but thats too far out for me, Ill make the 275s work or Ill be tubbing... I just bought an english wheel and a tubing bender today, gotta put em to work...
